DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.2) [(E)]

• When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

• When inspecting the connector, touch it with a paper clip or similar thin pin without directly inserting a tester probe into the terminal.

• Disconnect the negative battery terminal before performing any work that requires handling of connectors.

Step	Inspection	Action
1	INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector 2 which has body control module (BCM) terminals 2H and 2F. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F (wiring harness side). • Is the voltage between 1.5—3.5 V?	Yes	Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)
No	Go to the next step.
2	INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector C-09. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
No	Repair or replace the wiring harness between the body control module (BCM) and connector C-09 because the wiring harness is shorted to the power supply.
3	INSPECT CAN LINE BETWEEN CONNECTOR C-53 AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector C-53. • Connect the connector C-09. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
No	Repair or replace the wiring harness between the connector C-53 and connector C-09 because the wiring harness is shorted to the power supply.
4	INSPECT CAN LINE BETWEEN PM SENSOR AND CONNECTOR C-53 FOR SHORT TO POWER SUPPLY • Measure the voltage at PM sensor terminals B and C. • Is the voltage between 1.5—3.5 V?	Yes	Go to Step 6.
No	Go to the next step.
5	INSPECT PM SENSOR FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the PM sensor connector. • Connect the connector C-53. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the PM sensor because there is a short to the power supply in the PM sensor. (See PM SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Repair or replace the wiring harness between the PM sensor and connector C-53 because the wiring harness is shorted to the power supply.
6	INSPECT CAN LINE BETWEEN NOx SENSOR AND CONNECTOR C-53 FOR SHORT TO POWER SUPPLY • Measure the voltage at NOx sensor terminals B and C. • Is the voltage between 1.5—3.5 V?	Yes	Go to Step 8.
No	Go to the next step.
7	INSPECT NOx SENSOR FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the NOx sensor connector. • Connect the connector C-53. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the NOx sensor because there is a short to the power supply in the NOx sensor. (See NOx SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Repair or replace the wiring harness between the NOx sensor and connector C-53 because the wiring harness is shorted to the power supply.
8	INSPECT CAN LINE BETWEEN Mazda M Hybrid BATTERY AND CONNECTOR C-53 FOR SHORT TO POWER SUPPLY • Measure the voltage at Mazda M Hybrid battery terminals 1B and 1E. • Is the voltage between 1.5—3.5 V?	Yes	Go to Step 10.
No	Go to the next step.
9	INSPECT Mazda M Hybrid BATTERY FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the Mazda M Hybrid battery connector. • Connect the connector C-53. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the Mazda M Hybrid battery because there is a short to the power supply in the Mazda M Hybrid battery. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
No	Repair or replace the wiring harness between the Mazda M Hybrid battery and connector C-53 because the wiring harness is shorted to the power supply.
10	INSPECT CAN LINE BETWEEN CONNECTOR C-08 AND CONNECTOR C-53 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector C-08. • Connect the connector C-53. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	• Go to the next step. (L.H.D.) • Go to Step 15. (R.H.D.)
No	Repair or replace the wiring harness between the connector C-08 and connector C-53 because the wiring harness is shorted to the power supply.
11	INSPECT CAN LINE BETWEEN CONNECTORS C-35, C-34 AND CONNECTOR C-08 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connectors C-35, C-34. • Connect the connector C-08. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
No	Repair or replace the wiring harness between the connectors C-35, C-34 and connector C-08 because the wiring harness is shorted to the power supply.
12	INSPECT CAN LINE BETWEEN ELECTRONICALLY CONTROLLED BRAKE UNIT AND CONNECTORS C-35, C-34 FOR SHORT TO POWER SUPPLY • Measure the voltage at electronically controlled brake unit terminals 1D and 1F. • Is the voltage between 1.5—3.5 V?	Yes	Go to Step 14.
No	Go to the next step.
13	INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the electronically controlled brake unit connector. • Connect the connectors C-35, C-34. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the electronically controlled brake unit because there is a short to the power supply in the electronically controlled brake unit. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)
No	Repair or replace the wiring harness between the electronically controlled brake unit and connectors C-35, C-34 because the wiring harness is shorted to the power supply.
14	INSPECT CAN LINE BETWEEN CONNECTOR C-31 AND CONNECTORS C-35, C-34 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector C-31. • Connect the connectors C-35, C-34. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Go to Step 17.
No	Repair or replace the wiring harness between connector C-31 and connectors C-35, C-34 because the wiring harness is shorted to the power supply.
15	INSPECT CAN LINE BETWEEN CONNECTOR C-08 AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector C-31. • Connect the connector C-08. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Go to Step 17.
No	Go to the next step.
16	INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the electronically controlled brake unit connector. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the electronically controlled brake unit because there is a short to the power supply in the electronically controlled brake unit. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
No	Repair or replace the wiring harness between the connector C-08 and connector C-31 because the wiring harness is shorted to the power supply.
17	INSPECT CAN LINE BETWEEN DC-DC CONVERTER (Mazda M Hybrid) AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY • Measure the voltage at DC-DC converter (Mazda M Hybrid) terminals 1C and 1D. • Is the voltage between 1.5—3.5 V?	Yes	Go to Step 19.
No	Go to the next step.
18	INSPECT DC-DC CONVERTER (Mazda M Hybrid) FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the DC-DC converter (Mazda M Hybrid) connector. • Connect the connector C-31. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the DC-DC converter (Mazda M Hybrid) because there is a short to the power supply in the DC-DC converter (Mazda M Hybrid). (See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Repair or replace the wiring harness between the DC-DC converter (Mazda M Hybrid) and connector C-31 because the wiring harness is shorted to the power supply.
19	INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector C-02. • Connect the connector C-31. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
No	Repair or replace the wiring harness between connector C-02 and connector C-31 because the wiring harness is shorted to the power supply.
20	INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND CONNECTOR C-01 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector C-01. • Connect the connector C-02. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	• Go to Step 22.(SKYACTIV-G or SKYACTIV-X) • Go to Step 23.(SKYACTIV-D)
No	Go to the next step.
21	INSPECT INTEGRATED STARTER GENERATOR (ISG) FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the integrated starter generator (ISG) connector. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the integrated starter generator (ISG) because there is a short to the power supply in the integrated starter generator (ISG). (See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION [SKYACTIV-G (E)].)
No	Repair or replace the wiring harness between the connector C-02 and connector C-01 / integrated starter generator (ISG) because the wiring harness is shorted to the power supply.
22	INSPECT PCM FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the PCM connector. • Connect the connector C-01. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the PCM because there is a short to the power supply in the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
No	Repair or replace the wiring harness between the PCM and connector C-01 because the wiring harness is shorted to the power supply.
23	INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND PCM FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector C-02. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at PCM terminals 1AI and 1AN. • Is the voltage between 1.5—3.5 V?	Yes	Repair or replace the wiring harness between the connector C-01 and connector C-02 because the wiring harness is shorted to the power supply.
No	Go to the next step.
24	INSPECT PCM FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the PCM connector. • Connect the connector C-02. • Connect the connector C-01. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the PCM because there is a short to the power supply in the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
No	Repair or replace the wiring harness between the PCM and connector C-02 because the wiring harness is shorted to the power supply.

Step

Inspection

Action

INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector 2 which has body control module (BCM) terminals 2H and 2F.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F (wiring harness side).

• Is the voltage between 1.5—3.5 V?

Yes

Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM).

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)

Go to the next step.

INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector C-09.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Go to the next step.

Repair or replace the wiring harness between the body control module (BCM) and connector C-09 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTOR C-53 AND CONNECTOR C-09 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector C-53.

• Connect the connector C-09.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Go to the next step.

Repair or replace the wiring harness between the connector C-53 and connector C-09 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN PM SENSOR AND CONNECTOR C-53 FOR SHORT TO POWER SUPPLY

• Measure the voltage at PM sensor terminals B and C.

• Is the voltage between 1.5—3.5 V?

Yes

Go to Step 6.

Go to the next step.

INSPECT PM SENSOR FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the PM sensor connector.

• Connect the connector C-53.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the PM sensor because there is a short to the power supply in the PM sensor.

(See PM SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Repair or replace the wiring harness between the PM sensor and connector C-53 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN NOx SENSOR AND CONNECTOR C-53 FOR SHORT TO POWER SUPPLY

• Measure the voltage at NOx sensor terminals B and C.

• Is the voltage between 1.5—3.5 V?

Yes

Go to Step 8.

Go to the next step.

INSPECT NOx SENSOR FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the NOx sensor connector.

• Connect the connector C-53.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the NOx sensor because there is a short to the power supply in the NOx sensor.

(See NOx SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Repair or replace the wiring harness between the NOx sensor and connector C-53 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN Mazda M Hybrid BATTERY AND CONNECTOR C-53 FOR SHORT TO POWER SUPPLY

• Measure the voltage at Mazda M Hybrid battery terminals 1B and 1E.

• Is the voltage between 1.5—3.5 V?

Yes

Go to Step 10.

Go to the next step.

INSPECT Mazda M Hybrid BATTERY FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the Mazda M Hybrid battery connector.

• Connect the connector C-53.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the Mazda M Hybrid battery because there is a short to the power supply in the Mazda M Hybrid battery.

(See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)

Repair or replace the wiring harness between the Mazda M Hybrid battery and connector C-53 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTOR C-08 AND CONNECTOR C-53 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector C-08.

• Connect the connector C-53.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

• Go to the next step. (L.H.D.)

• Go to Step 15. (R.H.D.)

Repair or replace the wiring harness between the connector C-08 and connector C-53 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTORS C-35, C-34 AND CONNECTOR C-08 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connectors C-35, C-34.

• Connect the connector C-08.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Go to the next step.

Repair or replace the wiring harness between the connectors C-35, C-34 and connector C-08 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN ELECTRONICALLY CONTROLLED BRAKE UNIT AND CONNECTORS C-35, C-34 FOR SHORT TO POWER SUPPLY

• Measure the voltage at electronically controlled brake unit terminals 1D and 1F.

• Is the voltage between 1.5—3.5 V?

Yes

Go to Step 14.

Go to the next step.

INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the electronically controlled brake unit connector.

• Connect the connectors C-35, C-34.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the electronically controlled brake unit because there is a short to the power supply in the electronically controlled brake unit.

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)

Repair or replace the wiring harness between the electronically controlled brake unit and connectors C-35, C-34 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTOR C-31 AND CONNECTORS C-35, C-34 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector C-31.

• Connect the connectors C-35, C-34.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Go to Step 17.

Repair or replace the wiring harness between connector C-31 and connectors C-35, C-34 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTOR C-08 AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector C-31.

• Connect the connector C-08.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Go to Step 17.

Go to the next step.

INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the electronically controlled brake unit connector.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the electronically controlled brake unit because there is a short to the power supply in the electronically controlled brake unit.

(See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)

Repair or replace the wiring harness between the connector C-08 and connector C-31 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN DC-DC CONVERTER (Mazda M Hybrid) AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY

• Measure the voltage at DC-DC converter (Mazda M Hybrid) terminals 1C and 1D.

• Is the voltage between 1.5—3.5 V?

Yes

Go to Step 19.

Go to the next step.

INSPECT DC-DC CONVERTER (Mazda M Hybrid) FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the DC-DC converter (Mazda M Hybrid) connector.

• Connect the connector C-31.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the DC-DC converter (Mazda M Hybrid) because there is a short to the power supply in the DC-DC converter (Mazda M Hybrid).

(See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Repair or replace the wiring harness between the DC-DC converter (Mazda M Hybrid) and connector C-31 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND CONNECTOR C-31 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector C-02.

• Connect the connector C-31.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Go to the next step.

Repair or replace the wiring harness between connector C-02 and connector C-31 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND CONNECTOR C-01 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector C-01.

• Connect the connector C-02.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

• Go to Step 22.(SKYACTIV-G or SKYACTIV-X)

• Go to Step 23.(SKYACTIV-D)

Go to the next step.

INSPECT INTEGRATED STARTER GENERATOR (ISG) FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the integrated starter generator (ISG) connector.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the integrated starter generator (ISG) because there is a short to the power supply in the integrated starter generator (ISG).

(See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION [SKYACTIV-G (E)].)

Repair or replace the wiring harness between the connector C-02 and connector C-01 / integrated starter generator (ISG) because the wiring harness is shorted to the power supply.

INSPECT PCM FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the PCM connector.

• Connect the connector C-01.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the PCM because there is a short to the power supply in the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)

(See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

Repair or replace the wiring harness between the PCM and connector C-01 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND PCM FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector C-02.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at PCM terminals 1AI and 1AN.

• Is the voltage between 1.5—3.5 V?

Yes

Repair or replace the wiring harness between the connector C-01 and connector C-02 because the wiring harness is shorted to the power supply.

Go to the next step.

INSPECT PCM FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the PCM connector.

• Connect the connector C-02.

• Connect the connector C-01.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the PCM because there is a short to the power supply in the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Repair or replace the wiring harness between the PCM and connector C-02 because the wiring harness is shorted to the power supply.

Step	Inspection	Action
1	INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connector 2 which has body control module (BCM) terminals 2H and 2F. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F (wiring harness side). • Is the voltage between 1.5—3.5 V?	Yes	Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM). (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)
No	• Go to the next step. (R.H.D.) • Go to Step 6. (L.H.D.)
2	INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTORS C-35, C-34 FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the connectors C-35, C-34. • Connect the connector 2 which has body control module (BCM) terminals 2H and 2F. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
No	Repair or replace the wiring harness between the body control module (BCM) and connectors C-35, C-34 because the wiring harness is shorted to the power supply.
3	INSPECT CAN LINE BETWEEN DSC HU/CM AND CONNECTORS C-35, C-34 FOR SHORT TO POWER SUPPLY • Measure the voltage at DSC HU/CM terminals AQ and AN. • Is the voltage between 1.5—3.5 V?	Yes	Go to Step 5.
No	Go to the next step.
4	INSPECT DSC HU/CM FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the DSC HU/CM connector. • Connect the connectors C-35, C-34. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the DSC HU/CM because there is a short to the power supply in the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No	Repair or replace the wiring harness between the DSC HU/CM and connectors C-35, C-34 because the wiring harness is shorted to the power supply.
5	INSPECT CAN LINE BETWEEN CONNECTORS C-35, C-34 AND PCM FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the PCM connector. • Connect the connectors C-35, C-34. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the PCM because there is a short to the power supply in the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)
No	Repair or replace the wiring harness between connectors C-35, C-34 and PCM because the wiring harness is shorted to the power supply.
6	INSPECT DSC HU/CM FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the DSC HU/CM connector. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the DSC HU/CM because there is a short to the power supply in the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].)
No	Go to the next step.
7	INSPECT PCM FOR SHORT TO POWER SUPPLY • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Disconnect the PCM connector. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Switch the ignition ON (engine off). • Measure the voltage at body control module (BCM) terminals 2H and 2F. • Is the voltage between 1.5—3.5 V?	Yes	Replace the PCM because there is a short to the power supply in the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)
No	Repair or replace the wiring harness between the DSC HU/CM and body control module (BCM) / PCM because the wiring harness is shorted to the power supply.

Step

Inspection

Action

INSPECT BODY CONTROL MODULE (BCM) FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connector 2 which has body control module (BCM) terminals 2H and 2F.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F (wiring harness side).

• Is the voltage between 1.5—3.5 V?

Yes

Replace the body control module (BCM) because there is a short to the power supply in the body control module (BCM).

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [(E)].)

• Go to the next step. (R.H.D.)

• Go to Step 6. (L.H.D.)

INSPECT CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTORS C-35, C-34 FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the connectors C-35, C-34.

• Connect the connector 2 which has body control module (BCM) terminals 2H and 2F.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Go to the next step.

Repair or replace the wiring harness between the body control module (BCM) and connectors C-35, C-34 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN DSC HU/CM AND CONNECTORS C-35, C-34 FOR SHORT TO POWER SUPPLY

• Measure the voltage at DSC HU/CM terminals AQ and AN.

• Is the voltage between 1.5—3.5 V?

Yes

Go to Step 5.

Go to the next step.

INSPECT DSC HU/CM FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the DSC HU/CM connector.

• Connect the connectors C-35, C-34.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the DSC HU/CM because there is a short to the power supply in the DSC HU/CM.

(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)

Repair or replace the wiring harness between the DSC HU/CM and connectors C-35, C-34 because the wiring harness is shorted to the power supply.

INSPECT CAN LINE BETWEEN CONNECTORS C-35, C-34 AND PCM FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the PCM connector.

• Connect the connectors C-35, C-34.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the PCM because there is a short to the power supply in the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)

Repair or replace the wiring harness between connectors C-35, C-34 and PCM because the wiring harness is shorted to the power supply.

INSPECT DSC HU/CM FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the DSC HU/CM connector.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the DSC HU/CM because there is a short to the power supply in the DSC HU/CM.

(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].)

Go to the next step.

INSPECT PCM FOR SHORT TO POWER SUPPLY

• Switch the ignition off.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Disconnect the PCM connector.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

• Switch the ignition ON (engine off).

• Measure the voltage at body control module (BCM) terminals 2H and 2F.

• Is the voltage between 1.5—3.5 V?

Yes

Replace the PCM because there is a short to the power supply in the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)

Repair or replace the wiring harness between the DSC HU/CM and body control module (BCM) / PCM because the wiring harness is shorted to the power supply.

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