Honda HR-V: PCM Power and Ground Circuit Troubleshooting

1. Engine starting check.

1. Try to start the engine.

Does the engine start and idle smoothly?

YES

Go to the F-CAN circuit troubleshooting.

NO

Go to step 2.

2. Fuse check.

1. Turn the vehicle to the OFF (LOCK) mode.
2. Check the following fuse.

Is the fuse OK?

YES

Go to step 6.

NO

Go to step 3.

3. Shorted wire check (+B IGP line).

1. Remove the blown No. B7 (15 A) fuse from the under-hood fuse/relay box.
2. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.

3. Check for continuity between test points 1 and 2.

Is there continuity?

YES

Repair a short in the +B IGP wire between PGM-FI main relay 1 and the No. B7 (15 A) fuse. If the wire is OK, replace the under-hood fuse/relay box. Also replace the No. B7 (15 A) fuse.

NO

Go to step 4.

4. Part(s) internal circuit check (short in FI MAIN RLY OUT line).

1. Jump the SCS line with the HDS.

SCS Short

2. Disconnect each of the parts or connectors below, one at a time, then check for continuity between test points 1 and 2.

• PGM-FI main relay 2
• PCM connector A (51P)
• Each injector 2P connector
• CMP sensor 3P connector
• CKP sensor 3P connector
• Electronic throttle control system (ETCS) control relay

Does continuity go away when one of the above components is disconnected?

YES

Replace the part that made the short to body ground go away when it was disconnected. If the part is the PCM, update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM. Also replace the No. B7 (15 A) fuse in the under-hood fuse/relay box.

NO

Parts are OK. Go to step 5.

5. Shorted wire check (FI MAIN RLY OUT line).

1. Disconnect the following parts:
   • PGM-FI main relay 2
   • PCM connector A (51P)
   • Injectors
   • CMP sensor
   • CKP sensor
   • Electronic throttle control system (ETCS) control relay
2. Check for continuity between test points 1 and 2.

Is there continuity?

YES

Repair a short in the FI MAIN RLY OUT wire between PGM-FI main relay 1 and each part. Also replace the No. B7 (15 A) fuse in the under-hood fuse/relay box.

NO

The FI MAIN RLY OUT wire is OK. Replace PGM-FI main relay 1. Also replace the No. B7 (15 A) fuse in the under-hood fuse/relay box.

6. Fuse check 2.

1. Check the following fuse.

Is the fuse OK?

YES

Go to step 11.

NO

Go to step 7.

7. Relay check.

1. Remove the blown No. C32 (15 A) fuse from the under-dash fuse/relay box.
2. Remove PGM-FI main relay 2 (A) from the under-dash fuse/relay box.

3. Test PGM-FI main relay 2.

Is the relay OK?

YES

PGM-FI main relay 2 is OK. Go to step 8.

NO

Replace PGM-FI main relay 2. Also replace the No. C32 (15 A) fuse in the under-dash fuse/relay box.

8. Determine possible failure area (IG1(F/PUMP)/IG1 FUEL PUMP line, others).

1. Check for continuity between test points 1 and 2.

Is there continuity?

YES

Go to step 9.

NO

Go to step 10.

9. Shorted wire check (IG1(F/PUMP)/IG1 FUEL PUMP line).

1. Jump the SCS line with the HDS.

SCS Short

2. Disconnect the following connector.

PCM connector B (51P)

3. Check for continuity between test points 1 and 2.

Is there continuity?

YES

Repair a short in the IG1(F/PUMP)/IG1 FUEL PUMP wire between the No. C32 (15 A) fuse and the PCM (B3). Also replace the No. C32 (15 A) fuse.

NO

The IG1(F/PUMP)/IG1 FUEL PUMP wire is OK. Replace the No. C32 (15 A) fuse, and update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM.

10.Shorted wire check (FUEL PUMP RLY OUT line).

1. Disconnect the following connector.

Fuel tank unit 4P connector

2. Check for continuity between test points 1 and 2.

Is there continuity?

YES

Repair a short in the FUEL PUMP RLY OUT wire between PGM-FI main relay 2 and the fuel tank unit.

Also replace the No. C32 (15 A) fuse in the under-dash fuse/relay box.

NO

The FUEL PUMP RLY OUT wire is OK. Check the fuel pump, and replace it - Refer to: Fuel Tank Unit Removal and Installation (2WD), or Fuel Tank Unit Removal and Installation (AWD) if needed.

Also replace the No. C32 (15 A) fuse in the under-dash fuse/relay box.

11.Open wire check (IG1(F/PUMP)/IG1 FUEL PUMP line).

1. Jump the SCS line with the HDS.

SCS Short

2. Disconnect the following connector.

PCM connector B (51P)

3. Turn the vehicle to the ON mode.
4. Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

The IG1(F/PUMP)/IG1 FUEL PUMP wire is OK. Go to step 12.

NO

Repair an open in the IG1(F/PUMP)/IG1 FUEL PUMP wire between the No. C32 (15 A) fuse and the PCM (B3).

12.Determine possible failure area (PGM-FI main relay 1 control circuit, others).

1. Turn the vehicle to the OFF (LOCK) mode.
2. Jump the SCS line with the HDS.

SCS Short

3. Disconnect the following connector.

PCM connector A (51P)

4. Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

Go to step 15.

NO

Go to step 13.

13.Open wire check (+B IGP line).

1. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.

2. Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

Go to step 14.

NO

Repair an open in the +B IGP wire between PGM-FI main relay 1 and the No. B7 (15 A) fuse in the under-hood fuse/relay box. If the wire is OK, replace the under-hood fuse/relay box. Also replace the No. B7 (15 A) fuse.

14.Open wire check (FI MAIN RLY CL- line).

1. Check for continuity between test points 1 and 2.

Is there continuity?

YES

The FI MAIN RLY CL- wire is OK. Test PGM-FI main relay 1. If the relay is OK, update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM.

NO

Repair an open in the FI MAIN RLY CL- wire between the PCM (A7) and PGM-FI main relay

15.Open wire check (+B IGP line).

1. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.

2. Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

Go to step 16.

NO

Repair an open in the +B IGP wire between PGM-FI main relay 1 and the No. B7 (15 A) fuse in the under-hood fuse/relay box.

16.Open wire check (FI MAIN RLY OUT line).

1. Check for continuity between test points 1 and 2.

Is there continuity?

YES

The FI MAIN RLY OUT wire is OK. Go to step 17.

NO

Repair an open in the FI MAIN RLY OUT wire between the PCM (A9) and PGM-FI main relay 1.

17.Relay check.

1. Test PGM-FI main relay 1.

Is the relay OK?

YES

PGM-FI main relay 1 is OK. Go to step 18.

NO

Replace PGM-FI main relay 1.

18.Open wire check (PG(GND1), PG2(GND3), PG, LG(GND2) lines).

1. Disconnect the following connector.

PCM connector C (51P)

2. Check for continuity between the following PCM connector terminal and body ground individually.

Is there continuity?

YES

The PG(GND1), PG2(GND3), PG, and LG(GND2 wires are OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM.

NO

Repair an open in the PG(GND1), PG2(GND3), PG, or LG(GND2) wire between the PCM (B1, B18, C2, C20) and G101.

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