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DTC P1628:62 [DC-DC CONVERTER (Mazda M Hybrid)]

id140206302100

Outline

System malfunction location

DC-DC converter (Mazda M Hybrid): IG signal not matched

Detection condition

•  The IG signal output by the DC-DC converter (Mazda M Hybrid) and the IG signal received via CAN communication from the PCM do not match for a continuous 5 s after switching the ignition ON.

Precondition

•  1.5 s have elapsed after the ignition was switched ON (engine off or on)

•  Voltage at DC-DC converter (Mazda M Hybrid) terminal 1A is 9-16 V for a continuous 1 s

Fail-safe

•  Inhibits the i-stop control.

Possible cause

•  Short to ground in PCM power supply circuit

•  Open circuit in PCM power supply circuit

•  Malfunction in CAN communication line between PCM and DC-DC converter (Mazda M Hybrid)

•  F47 15 A fuse malfunction

•  Connector or terminal malfunction of the following parts:

―  PCM

―  DC-DC converter (Mazda M Hybrid)

•  Short circuit in DC-DC converter (Mazda M Hybrid) power supply circuit and signal circuit

•  Short to ground in DC-DC converter (Mazda M Hybrid) signal circuit

•  Open circuit in DC-DC converter (Mazda M Hybrid) signal circuit

•  DC-DC converter (Mazda M Hybrid) malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

•  Record the snapshot data.

Note

•  Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

2

VERIFY INTEGRATED STARTER GENERATOR (ISG) DTC

•  Perform the DTC inspection for the integrated starter generator (ISG).
(See DTC INSPECTION.)

•  Is DTC P1BC9:00 a present malfunction?

Yes

Go to Step 4.

No

Go to the next step.

3

VERIFY Mazda M Hybrid BATTERY DTC

•  Perform the DTC inspection for the Mazda M Hybrid battery.
(See DTC INSPECTION.)

•  Are any of the following DTCs displayed?

―  P1793:12

―  P1793:14

Yes

Go to the next step.

No

Go to Step 7.

4

INSPECT PCM POWER SUPPLY CIRCUIT FOR SHORT TO GROUND

•  Inspect the applicable circuit for a short to ground.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification 1.

5

INSPECT PCM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification 1.

6

VERIFY DTCs

•  Perform the DTC inspection for the following modules.
(See DTC INSPECTION.)

―  PCM

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-G (E))].)

(See DTC TABLE [PCM (SKYACTIV-X)].)

No

Go to the next step.

7

INSPECT F47 15 A FUSE

•  Switch the ignition off.

•  Remove the F47 15 A fuse.

•  Inspect the F47 15 A fuse.

•  Is the fuse normal?

Yes

Reinstall the F47 15 A fuse, then go to the next step.

No

Replace the F47 15 A fuse and perform the repair completion verification 1.

8

INSPECT PCM CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location then perform the repair completion verification 1.

9

INSPECT DC-DC CONVERTER (Mazda M Hybrid) CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location then perform the repair completion verification 1.

10

INSPECT DC-DC CONVERTER (Mazda M Hybrid) INTERNAL CIRCUIT FOR SHORT TO GROUND

•  Verify that the DC-DC converter (Mazda M Hybrid) and PCM connectors are disconnected.

•  Inspect for continuity between DC-DC converter (Mazda M Hybrid) 1B (part-side) and body ground.

•  Is there continuity?

Yes

Replace the DC-DC converter (Mazda M Hybrid) and perform the repair completion verification 1.

(See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)

No

Go to the next step.

11

INSPECT DC-DC CONVERTER (Mazda M Hybrid) INTERNAL CIRCUITS FOR SHORT CIRCUIT

•  Verify that the DC-DC converter (Mazda M Hybrid) and PCM connectors are disconnected.

•  Inspect for continuity between DC-DC converter (Mazda M Hybrid) terminal 1B (part-side) and 1A (part-side).

•  Is there continuity?

Yes

Replace the DC-DC converter (Mazda M Hybrid) and perform the repair completion verification 1.

(See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)

No

Go to the next step.

12

INSPECT DC-DC CONVERTER (Mazda M Hybrid) POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT CIRCUIT

•  Inspect the applicable circuits for a short circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification 1.

13

INSPECT DC-DC CONVERTER (Mazda M Hybrid) SIGNAL CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND

•  Access the following PIDs using the M-MDS:
(See PID/DATA MONITOR INSPECTION.)

(See PID/DATA MONITOR TABLE [DC-DC CONVERTER (Mazda M Hybrid)].)

DC-DC converter (Mazda M Hybrid):

―  IG_STAT

•  Does the PID value fluctuate when the following connectors are shaken?

―  IG1 relay No.2

―  DC-DC converter (Mazda M Hybrid)

Yes

Repair or replace the applicable wiring harness or connector parts.

Go to repair completion verification 1.

No

Go to the next step.

14

INSPECT PCM FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Switch the ignition ON (engine off or on) and wait for 15 s or more.

•  Perform the DTC inspection for the DC-DC converter (Mazda M Hybrid).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

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

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the PCM and perform the repair completion verification 1.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)

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

No

The system is normal. (Explain to the customer that a malfunction was detected temporarily, but the vehicle is currently normal.)

Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Switch the ignition ON (engine off or on) and wait for 15 s or more.

•  Perform the DTC inspection for the DC-DC converter (Mazda M Hybrid).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

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

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the DC-DC converter (Mazda M Hybrid), then go to the next step.
(See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

System malfunction location	DC-DC converter (Mazda M Hybrid): IG signal not matched
Detection condition	• The IG signal output by the DC-DC converter (Mazda M Hybrid) and the IG signal received via CAN communication from the PCM do not match for a continuous 5 s after switching the ignition ON. Precondition • 1.5 s have elapsed after the ignition was switched ON (engine off or on) • Voltage at DC-DC converter (Mazda M Hybrid) terminal 1A is 9-16 V for a continuous 1 s
Fail-safe	• Inhibits the i-stop control.
Possible cause	• Short to ground in PCM power supply circuit • Open circuit in PCM power supply circuit • Malfunction in CAN communication line between PCM and DC-DC converter (Mazda M Hybrid) • F47 15 A fuse malfunction • Connector or terminal malfunction of the following parts: ― PCM ― DC-DC converter (Mazda M Hybrid) • Short circuit in DC-DC converter (Mazda M Hybrid) power supply circuit and signal circuit • Short to ground in DC-DC converter (Mazda M Hybrid) signal circuit • Open circuit in DC-DC converter (Mazda M Hybrid) signal circuit • DC-DC converter (Mazda M Hybrid) malfunction

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	VERIFY INTEGRATED STARTER GENERATOR (ISG) DTC • Perform the DTC inspection for the integrated starter generator (ISG). (See DTC INSPECTION.) • Is DTC P1BC9:00 a present malfunction?	Yes	Go to Step 4.
2		No	Go to the next step.
3	VERIFY Mazda M Hybrid BATTERY DTC • Perform the DTC inspection for the Mazda M Hybrid battery. (See DTC INSPECTION.) • Are any of the following DTCs displayed? ― P1793:12 ― P1793:14	Yes	Go to the next step.
3		No	Go to Step 7.
4	INSPECT PCM POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
5	INSPECT PCM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
6	VERIFY DTCs • Perform the DTC inspection for the following modules. (See DTC INSPECTION.) ― PCM • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G (E))].) (See DTC TABLE [PCM (SKYACTIV-X)].)
6		No	Go to the next step.
7	INSPECT F47 15 A FUSE • Switch the ignition off. • Remove the F47 15 A fuse. • Inspect the F47 15 A fuse. • Is the fuse normal?	Yes	Reinstall the F47 15 A fuse, then go to the next step.
7		No	Replace the F47 15 A fuse and perform the repair completion verification 1.
8	INSPECT PCM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location then perform the repair completion verification 1.
9	INSPECT DC-DC CONVERTER (Mazda M Hybrid) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location then perform the repair completion verification 1.
10	INSPECT DC-DC CONVERTER (Mazda M Hybrid) INTERNAL CIRCUIT FOR SHORT TO GROUND • Verify that the DC-DC converter (Mazda M Hybrid) and PCM connectors are disconnected. • Inspect for continuity between DC-DC converter (Mazda M Hybrid) 1B (part-side) and body ground. • Is there continuity?	Yes	Replace the DC-DC converter (Mazda M Hybrid) and perform the repair completion verification 1. (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)
10		No	Go to the next step.
11	INSPECT DC-DC CONVERTER (Mazda M Hybrid) INTERNAL CIRCUITS FOR SHORT CIRCUIT • Verify that the DC-DC converter (Mazda M Hybrid) and PCM connectors are disconnected. • Inspect for continuity between DC-DC converter (Mazda M Hybrid) terminal 1B (part-side) and 1A (part-side). • Is there continuity?	Yes	Replace the DC-DC converter (Mazda M Hybrid) and perform the repair completion verification 1. (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)
11		No	Go to the next step.
12	INSPECT DC-DC CONVERTER (Mazda M Hybrid) POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR SHORT CIRCUIT • Inspect the applicable circuits for a short circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
13	INSPECT DC-DC CONVERTER (Mazda M Hybrid) SIGNAL CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.) (See PID/DATA MONITOR TABLE [DC-DC CONVERTER (Mazda M Hybrid)].) DC-DC converter (Mazda M Hybrid): ― IG_STAT • Does the PID value fluctuate when the following connectors are shaken? ― IG1 relay No.2 ― DC-DC converter (Mazda M Hybrid)	Yes	Repair or replace the applicable wiring harness or connector parts. Go to repair completion verification 1.
13		No	Go to the next step.
14	INSPECT PCM FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the ignition ON (engine off or on) and wait for 15 s or more. • Perform the DTC inspection for the DC-DC converter (Mazda M Hybrid). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM and perform the repair completion verification 1. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
14		No	The system is normal. (Explain to the customer that a malfunction was detected temporarily, but the vehicle is currently normal.) Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the ignition ON (engine off or on) and wait for 15 s or more. • Perform the DTC inspection for the DC-DC converter (Mazda M Hybrid). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the DC-DC converter (Mazda M Hybrid), then go to the next step. (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.