HPCM Diagnosis Procedure

POWER SUPPLY AND GROUND CIRCUIT

HPCM : Diagnosis Procedure


1. CHECK FUSE

1.Turn ignition switch OFF.
2.Check that the following fuse is not fusing.





Is the fuse fusing?
YES- Replace the fuse after repairing the applicable circuit.
NO- GO TO 2.

2. CHECK HPCM POWER SUPPLY-1

Check the voltage between HPCM harness connector terminals.





Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 3.

3. CHECK HPCM POWER SUPPLY-2

1.Disconnect HPCM harness connector.
2.Check the voltage between HPCM harness connector and ground.





Is the inspection result normal?
YES- GO TO 9.
NO- Perform the trouble diagnosis for power supply circuit.

4. CHECK HPCM POWER SUPPLY-3

Check the voltage between HPCM harness connector terminals as per the following condition.





Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- GO TO 5.

5. CHECK SELF SHUT-OFF RELAY SIGNAL

1.Turn ignition switch ON.
2.Check the voltage between HPCM harness connector terminals.





Is the inspection result normal?
YES- Replace self shut-OFF relay.
NO- GO TO 6.

6. CHECK SELF SHUT-OFF RELAY SIGNAL

1.Turn ignition switch OFF.
2.Disconnect HPCM harness connector.
3.Check the continuity between HPCM harness connector and self shut-OFF relay.





4.Also check harness for short to ground.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace error-detected parts.

7. CHECK IGNITION POWER SUPPLY

1.Turn ignition switch ON.
2.Check the voltage between HPCM harness connector and ground.





Is the inspection result normal?
YES- Replace HPCM. Removal and Installation.
NO- GO TO 8.

8. CHECK IGNITION POWER SUPPLY CIRCUIT

1.Disconnect IPDM E/R harness connector.
2.Check the continuity between HPCM harness connector and IPDM E/R harness connector.





3.Also check harness for short to ground.
Is the inspection result normal?
YES- Replace IPDM E/R. Removal and Installation.
NO- Repair or replace error-detected parts.

9. CHECK GROUND CONNECTION

Check the ground connection B24. Circuit Inspection.
Is the inspection result normal?
YES- GO TO 10.
NO- Repair or replace ground connection.

10. CHECK HPCM GROUND CIRCUIT

Check the continuity between HPCM harness connector and ground.





Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- Repair or replace error-detected parts.