Injector Control Module Relay Circuit Troubleshooting

Injector Control Module Relay Circuit Troubleshooting

1. Turn the ignition switch OFF.
2. Remove the driver's dashboard under cover.




3. Remove the injector control module relay (A).




4. Connect injector control module relay 5P connector terminal No. 3 to body ground with a jumper wire.
5. Jump the SCS line with the HDS.
6. Disconnect PCM connector A (44P).




7. Check for continuity between body ground and PCM connector terminal A15.

Is there continuity?

YES - Go to step 8.

NO - Repair open in the wire between the injector control module relay and the PCM (A15).




8. Measure voltage between injector control module relay 5P connector terminal No. 1 and body ground.

Is there battery voltage?

YES - Go to step 9.

N0 -
- Repair open in the wire between the injector control module relay and the No. 5 +B INJ (15 A) fuse in the under-dash fuse/relay box. Also replace the No. 5 +B INJ (15 A) fuse in the under-dash fuse/relay box.
- Repair open in the wire between the No. 5 +B INJ (15 A) fuse in the under-dash fuse/relay box and the No. 5 +B OP MAIN (80 A) fuse in the under-hood fuse/relay box. Also replace the No. 5 +B OP MAIN (80 A) fuse in the under-hood fuse/relay box.
- If needed, replace the under-hood fuse/relay box, or the under-dash fuse/relay box.

9. Turn the ignition switch ON (II).




10. Measure voltage between injector control module relay 5P connector terminal No. 5 and body ground.

Is there battery voltage?

YES - Go to step 11.

NO - Repair open in the wire between the injector control module relay and PGM-FI main relay 1 (C).

11. Turn the ignition switch OFF.
12. Reconnect the injector control module relay and PCM connector A (44P).
13. Open the SCS line with the HDS.
14. Turn the ignition switch ON (II).




15. Measure voltage between injector control module relay 5P connector terminal No. 2 and body ground.

Is there battery voltage?

YES - Repair open in the wire between the injector control module relay, the injector control module, the injector, or the fuel shut-off solenoid valve relay.

NO - Go to step 16.

16. Test the injector control module relay.

Is the injector control module relay OK?

YES - 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 with a known-good PCM, replace the original PCM.

NO - Replace the injector control module relay.