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DETERMINING SHORT TO POWER SUPPLY LOCATION (CAN-BUS No.1) [(E)]

id1002x2001900

Caution

•  Perform the following malfunction diagnosis only when it is diagnosed with a short to ground by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

System Wiring Diagram

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Determination Procedure

Caution

•  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 CAN LINE BETWEEN BODY CONTROL MODULE (BCM) AND CONNECTOR C-40/C-41 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-40 (L.H.D.). •  Disconnect the connector C-41 (R.H.D.). •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 3.
		No	Go to the next step.
2	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 3 which has body control module (BCM) terminals 3X and 3W. •  Connect the connector C-40 (L.H.D.). •  Connect the connector C-41 (R.H.D.). •  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 3X and 3W (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	•  Repair or replace the wiring harness between the connector C-40 and body control module (BCM) because the wiring harness is shorted to the power supply (L.H.D.). •  Repair or replace the wiring harness between the connector C-41 and body control module (BCM) because the wiring harness is shorted to the power supply (R.H.D.).
3	INSPECT CAN LINE BETWEEN EPS CONTROL MODULE AND CONNECTOR C-40/C-41 FOR SHORT TO POWER SUPPLY •  Measure the voltage at EPS control module terminals 2C and 2A. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 5.
		No	Go to the next step.
4	INSPECT EPS CONTROL MODULE FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) •  Disconnect the EPS control module connector. •  Connect the connector C-40 (L.H.D.). •  Connect the connector C-41 (R.H.D.). •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the EPS control module because there is a short to the power supply in the EPS control module. (See STEERING WHEEL AND COLUMN INSPECTION.)
		No	•  Repair or replace the wiring harness between the EPS control module and connector C-40 because the wiring harness is shorted to the power supply (L.H.D.). •  Repair or replace the wiring harness between the EPS control module and connector C-41 because the wiring harness is shorted to the power supply (R.H.D.).
5	INSPECT CAN LINE BETWEEN AUTO LEVELING CONTROL MODULE / ADAPTIVE LED HEADLIGHTS CONTROL MODULE AND CONNECTOR C-40/C-41 FOR SHORT TO POWER SUPPLY •  Measure the voltage at auto leveling control module / adaptive LED headlights control module terminals E and H. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 7.
		No	Go to the next step.
6	INSPECT AUTO LEVELING CONTROL MODULE / ADAPTIVE LED HEADLIGHTS CONTROL MODULE FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) •  Disconnect the auto leveling control module / adaptive LED headlights control module connector. •  Connect the connector C-40 (L.H.D.). •  Connect the connector C-41 (R.H.D.). •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the auto leveling control module / adaptive LED headlights control module because there is a short to the power supply in the auto leveling control module / adaptive LED headlights control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION [(E)].) (See ADAPTIVE LED HEADLIGHTS CONTROL MODULE REMOVAL/INSTALLATION.)
		No	•  Repair or replace the wiring harness between the auto leveling control module / adaptive LED headlights control module and connector C-40 because the wiring harness is shorted to the power supply (L.H.D.). •  Repair or replace the wiring harness between the auto leveling control module / adaptive LED headlights control module and connector C-41 because the wiring harness is shorted to the power supply (R.H.D.).
7	INSPECT CAN LINE BETWEEN CONNECTOR C-13 AND CONNECTOR C-40/C-41 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-13. •  Connect the connector C-40 (L.H.D.). •  Connect the connector C-41 (R.H.D.). •  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 3X and 3W. •  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-40 and connector C-13 because the wiring harness is shorted to the power supply (L.H.D.). •  Repair or replace the wiring harness between the connector C-41 and connector C-13 because the wiring harness is shorted to the power supply (R.H.D.).
8	INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND CONNECTOR C-13 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-21. •  Connect the connector C-13. •  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 3X and 3W. •  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-21 and connector C-13 because the wiring harness is shorted to the power supply.
9	INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND PCM FOR SHORT TO POWER SUPPLY •  Measure the voltage at PCM terminals 2S and 2T. (SKYACTIV-G or SKYACTIV-X) •  Measure the voltage at PCM terminals 2AK and 2AL. (SKYACTIV-D) •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Go to Step 13.
10	INSPECT CAN LINE BETWEEN CONNECTOR C-21 AND CONNECTORS C-55, C-56 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-55, C-56. •  Connect the connector C-21. •  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 3X and 3W. •  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-21 and connectors C-55, C-56 because the wiring harness is shorted to the power supply.
11	INSPECT CAN LINE BETWEEN SAS CONTROL MODULE AND CONNECTORS C-55, C-56 FOR SHORT TO POWER SUPPLY •  Measure the voltage at PCM terminals 2S and 2T. (SKYACTIV-G or SKYACTIV-X) •  Measure the voltage at PCM terminals 2AK and 2AL. (SKYACTIV-D) •  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-55, C-56 and connector C-21 because the wiring harness is shorted to the power supply.
12	INSPECT SAS CONTROL MODULE FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)]) •  Disconnect the SAS control module connector. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)]) •  Switch the ignition ON (engine off). •  Inspect for continuity between SAS control module terminals 3A and 3D (wiring harness side). •  Is the voltage 0 V?	Yes	Replace the SAS control module connector because there is a short to the power supply in the SAS control module connector. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
		No	Repair or replace the wiring harness between the SAS control module and connectors C-55, C-56 because the wiring harness is shorted to the power supply.
13	INSPECT CAN LINE BETWEEN CONNECTOR C-07 AND CONNECTOR C-21 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-07. •  Connect the connector C-21. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	•  Go to the next step. (SKYACTIV-D (ATX)) (with connectors C-37, C-36) •  Go to Step 20. (SKYACTIV-D (ATX)) (without connectors C-37, C-36) •  Go to Step 24. (SKYACTIV-G or SKYACTIV-X or SKYACTIV-D (MTX)) (with connectors C-37, C-36) •  Go to Step 28. (SKYACTIV-G or SKYACTIV-X or SKYACTIV-D (MTX)) (without connectors C-37, C-36)
		No	Repair or replace the wiring harness between the connector C-07 and connector C-21 because the wiring harness is shorted to the power supply.
14	INSPECT CAN LINE BETWEEN CONNECTORS C-37, C-36 AND CONNECTOR C-07 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-37, C-36. •  Connect the connector C-07. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Go to Step 17.
15	INSPECT CAN LINE BETWEEN CONNECTOR C-07 AND CONNECTOR C-02 / CONNECTORS C-37, C-36 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 body control module (BCM) terminals 3X and 3W. •  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-07 and connector C-02 / connectors C-37, C-36 because the wiring harness is shorted to the power supply.
16	INSPECT TCM FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) •  Disconnect the TCM connector. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the TCM because there is a short to the power supply in the TCM. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [ET6A-EL, ET6AX-EL (E)].) (See CONTROL VALVE BODY REMOVAL/INSTALLATION [EV6A-EL, EV6AX-EL (E)].)
		No	Repair or replace the wiring harness between the TCM and connector C-02 because the wiring harness is shorted to the power supply.
17	INSPECT CAN LINE BETWEEN DSC HU/CM / ELECTRONICALLY CONTROLLED BRAKE UNIT AND CONNECTORS C-37, C-36 FOR SHORT TO POWER SUPPLY •  Measure the voltage at DSC HU/CM terminals L and J.(without Mazda M Hybrid) •  Measure the voltage at electronically controlled brake unit terminals 1AM and 1AO.(with Mazda M Hybrid) •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 19.
		No	Go to the next step.
18	INSPECT DSC HU/CM / 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 DSC HU/CM / electronically controlled brake unit connector. •  Connect the connectors C-37, C-36. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the DSC HU/CM / electronically controlled brake unit because there is a short to the power supply in the DSC HU/CM / electronically controlled brake unit. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
		No	Repair or replace the wiring harness between the DSC HU/CM / electronically controlled brake unit and connectors C-37, C-36 because the wiring harness is shorted to the power supply.
19	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 connectors C-37, C-36. •  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 3X and 3W. •  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].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
		No	Repair or replace the wiring harness between the PCM and connectors C-37, C-36 because the wiring harness is shorted to the power supply.
20	INSPECT CAN LINE BETWEEN TCM AND CONNECTOR C-02 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-07. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Go to the next step.
		No	Go to Step 22.
21	INSPECT TCM FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) •  Disconnect the TCM connector. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the TCM because there is a short to the power supply in the TCM. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [ET6A-EL, ET6AX-EL (E)].) (See CONTROL VALVE BODY REMOVAL/INSTALLATION [EV6A-EL, EV6AX-EL (E)].)
		No	Repair or replace the wiring harness between the TCM and connector C-02 because the wiring harness is shorted to the power supply.
22	INSPECT DSC HU/CM / 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 DSC HU/CM / 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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the DSC HU/CM / electronically controlled brake unit because there is a short to the power supply in the DSC HU/CM / electronically controlled brake unit. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
		No	Go to the next step.
23	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 3X and 3W. •  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].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
		No	Repair or replace the wiring harness between the PCM and connector C-07 because the wiring harness is shorted to the power supply.
24	INSPECT CAN LINE BETWEEN CONNECTORS C-37, C-36 AND CONNECTOR C-07 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-37, C-36. •  Connect the connector C-07. •  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 3X and 3W. •  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-37, C-36 and connector C-07 because the wiring harness is shorted to the power supply.
25	INSPECT CAN LINE BETWEEN DSC HU/CM / ELECTRONICALLY CONTROLLED BRAKE UNIT AND CONNECTORS C-37, C-36 FOR SHORT TO POWER SUPPLY •  Measure the voltage at DSC HU/CM terminals L and J. (without Mazda M Hybrid) •  Measure the voltage at electronically controlled brake unit terminals 1AM and 1AO. (with Mazda M Hybrid) •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 27.
		No	Go to the next step.
26	INSPECT DSC HU/CM / 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 DSC HU/CM / electronically controlled brake unit connector. •  Connect the connectors C-37, C-36. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the DSC HU/CM / electronically controlled brake unit because there is a short to the power supply in the DSC HU/CM / electronically controlled brake unit. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
		No	Repair or replace the wiring harness between the DSC HU/CM / electronically controlled brake unit and connectors C-37, C-36 because the wiring harness is shorted to the power supply.
27	INSPECT CAN LINE BETWEEN CONNECTORS C-37, C-36 AND CONNECTOR C-02 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 connectors C-37, C-36. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	•  Go to Step 30. (SKYACTIV-G or SKYACTIV-X (ATX)) •  Go to Step 34. (SKYACTIV-G or SKYACTIV-X (MTX), SKYACTIV-D (MTX))
		No	Repair or replace the wiring harness between the connectors C-37, C-36 and connector C-02 because the wiring harness is shorted to the power supply.
28	INSPECT CAN LINE BETWEEN DSC HU/CM / ELECTRONICALLY CONTROLLED BRAKE UNIT AND CONNECTOR C-07 / CONNECTOR C-02 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 DSC HU/CM terminals L and J. (without Mazda M Hybrid) •  Measure the voltage at electronically controlled brake unit terminals 1AM and 1AO. (with Mazda M Hybrid) •  Is the voltage between 1.5—3.5 V?	Yes	•  Go to Step 30. (SKYACTIV-G or SKYACTIV-X (ATX)) •  Go to Step 34. (SKYACTIV-G or SKYACTIV-X (MTX), SKYACTIV-D (MTX))
		No	Go to the next step.
29	INSPECT DSC HU/CM / 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 DSC HU/CM / electronically controlled brake unit connector. •  Connect the connectors C-07. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the DSC HU/CM / electronically controlled brake unit because there is a short to the power supply in the DSC HU/CM / electronically controlled brake unit. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
		No	Repair or replace the wiring harness between the DSC HU/CM / electronically controlled brake unit and connector C-07 / connector C-02 because the wiring harness is shorted to the power supply.
30	INSPECT CAN LINE BETWEEN CONNECTOR C-02 AND CONNECTOR C-38 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-38. •  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 3X and 3W. •  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-02 and connector C-38 because the wiring harness is shorted to the power supply.
31	INSPECT CAN LINE BETWEEN TCM AND CONNECTOR C-38 FOR SHORT TO POWER SUPPLY •  Measure the voltage at TCM terminals E and F. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 33.
		No	Go to the next step.
32	INSPECT TCM FOR SHORT TO POWER SUPPLY •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) •  Disconnect the TCM connector. •  Connect the connector C-38. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Replace the TCM because there is a short to the power supply in the TCM. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [ET6A-EL, ET6AX-EL (E)].) (See CONTROL VALVE BODY REMOVAL/INSTALLATION [EV6A-EL, EV6AX-EL (E)].)
		No	Repair or replace the wiring harness between the TCM and connector C-38 because the wiring harness is shorted to the power supply.
33	INSPECT CAN LINE BETWEEN CONNECTOR C-38 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-38. •  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 3X and 3W. •  Is the voltage between 1.5—3.5 V?	Yes	Go to Step 35.
		No	Repair or replace the wiring harness between connector C-38 and connector C-01 because the wiring harness is shorted to the power supply.
34	INSPECT CAN LINE BETWEEN CONNECTOR C-01 AND CONNECTOR C-02 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 3X and 3W. •  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-01 and connector C-02 because the wiring harness is shorted to the power supply.
35	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 3X and 3W. •  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].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
		No	Repair or replace the wiring harness between the PCM and connector C-01 because the wiring harness is shorted to the power supply.