IMA System Indicator Circuit Troubleshooting

IMA System Indicator Circuit Troubleshooting
1. Turn the ignition switch ON (II), and watch the IMA system indicator.
Does the IMA indicator come on and stay on?
YES- Go to step 17.
NO- Go to step 2.
2. Check the No. 6 METER (7.5 A) fuse.
Is the fuse OK?
YES- Go to step 3.
NO- Check for:
^ A blown No. 6 METER (7.5 A) fuse
^ A short or open in the wire between the No. 6 METER (7.5 A) fuse and the gauge assembly.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF.
5. Remove the IPU lid.





6. Connect MCM connector terminal A18 and body ground with a jumper wire.
7. Turn the ignition switch ON (II).
Is the IMA system indicator ON?
YES- Go to step 9.
NO- Go to step 8.
8. Check the IMA system indicator bulb.
Is IMA system indicator bulb OK?
YES- Repair open in the wire between the MCM (A18) and the gauge assembly.
NO- Replace the IMA system indicator bulb.
9. Check the No. 24 IMA (7.5 A) fuse.
Is the fuse OK?
YES- Go to step 10.
NO- Check for:
^ A blown No. 24 IMA (7.5 A) fuse.
^ A short or open in the wire between the No. 24 IMA (7.5 A) fuse and the MCM.





10. Measure voltage between body ground and MCM connector terminals A11, and B1 individually.
Is there battery voltage?
YES- Go to step 16.
NO- Go to step 11.
11. Turn the ignition switch OFF.
12. Check the MCM relay (ignition hold relay).
Is the relay OK ?
YES- Go to step 13.
NO- Replace the MCM relay (ignition hold relay).
13. Turn the ignition switch ON (II).





14. Measure voltage between the MCM relay (ignition hold relay) 4P connector terminal No. 4 and body ground.
Is there battery voltage?
YES- Go to step 15.
NO- Check for:
^ Repair open in the wire between the No. 24 IMA (7.5 A) fuse and the diodes
^ Repair open in the wire between the motor control module relay and the diode.
^ A faulty diode.





15. Measure voltage between MCM relay (ignition hold relay) 4P connector terminal No. 2 and body ground.
Is there battery voltage?
YES- Repair open in the wire between the MCM (All, B1) and the MCM relay (ignition hold relay).
NO- Check for: A blown No. 18 IMA (7.5 A) fused A open in the wire between the No. 18 IMA (7.5 A) fuse and the MCM relay (ignition hold relay).





16. Measure voltage between body ground and MCM connector terminals A10, A23, A24 and B9 individually.
Is there less than 1.0 V?
YES- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
NO- Repair the open in the wire(s) that had more than 1.0 V between G101 and the MCM (A10, A23, A24, B9).
17. Turn the ignition switch ON (II), and watch the IMA system indicator.
Are any DTCs indicated?
YES- Go to DTC Troubleshooting Index.
NO- Go to step 18.
18. Turn the ignition switch OFF.
19. Turn the battery module switch OFF.
20. Remove the IPU lid.
21. Disconnect MCM connector A.
22. Turn the ignition switch ON (II).
Does the IMA system indicator stay on?
YES- Repair short in the wire between the MCM (A18) and the gauge assembly.
NO- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.