IMA System Indicator Circuit Troubleshooting
IMA System Indicator Circuit TroubleshootingNOTE: If the IMA system indicator stay on or never comes on, do this troubleshooting (if no DTC's are set).
1. Turn the ignition switch ON (II), and watch the IMA system indicator.
Does the IMA system indicator come on?
YES - Go to step 2.
NO - Go to step 4.
2. Turn the ignition switch ON (II), wait 2 seconds, and watch the IMA system indicator.
Does the IMA system indicator come on and stay on?
YES - Go to step 3.
NO - The IMA system indicator circuit is OK.
3. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - Go to the indicated DTC's troubleshooting.
NO - Do the gauge self-diagnostic function.
4. Do the gauge self-diagnostic function.
Does the IMA system indicator flash?
YES - Go to step 5.
NO - Substitute a known-good gauge control module, and recheck. If the IMA system indicator circuit is OK, replace the original gauge control module.
5. Check the 12 V battery terminal connections.
Are the connections OK?
YES - Go to step 6.
NO - Repair the connections or replace the 12 V battery.
6. Turn the ignition switch OFF.
7. Turn the battery module switch OFF.
8. Remove the IPU lid.
9. Disconnect MCM connector B (24P).
10. Turn the ignition switch ON (II).
11. Measure voltage between MCM connector terminal B6 and body ground.
Is there battery voltage?
YES - Go to step 12.
NO -
^ Repair open or short in the wire between the No. 21 METER (7.5 A) fuse in the under-dash fuse/relay box and the MCM (B6).
^ Replace the No. 21 METER (7.5 A) fuse.
12. Measure voltage between MCM connector terminal B7 and body ground.
Is there battery voltage?
YES - Go to step 13.
NO - Go to step 15.
13. Disconnect MCM connector B (24P).
14. Check for continuity between body ground and MCM connector terminals B3 and B5 individually.
Is there continuity?
YES - Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck. If the symptom/indication goes away with a known-good MCM, replace the original MCM.
NO -
^ Repair open in the wire between G652 and the MCM (B3).
^ Repair open in the wire between G901, G902 and the MCM (B5).
15. Turn the ignition switch OFF.
16. Remove MCM relay 1 (A).
17. Check MCM relay 1.
Is the relay OK?
YES - Go to step 18.
NO - Replace MCM relay 1.
18. Measure voltage between body ground and MCM relay 1 V connector terminals No. 2 and No. 4 individually.
Is there battery voltage?
YES - Go to step 19.
NO -
^ Repair open in the wire between the IMA (7.5 A) and MCM relay 1. Also replace the IMA (7.5 A) fuse.
^ Repair short in the wire between MCM relay 1, MCM relay 2, and MCM (B7).
^ Repair open in the wire between the IMA (7.5 A) and OPTION (40 A) fuse. Also replace the OPTION (40 A) fuse.
19. Reconnect MCM relay 1.
20. Turn the ignition switch ON (II).
21. Measure voltage between MCM connector terminal B15 and body ground.
Is there battery voltage?
YES - Go to step 22.
NO - Repair open in the wire between MCM relay 1 and the MCM (B15).
22. Turn the ignition switch OFF.
23. Check for continuity between MCM connector terminals B7 and MCM relay 1 4P connector terminal No. 1.
Is there continuity?
YES - Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck. If the symptom/indication goes away with a known-good MCM, replace the original MCM.
NO - Repair open in the wire between MCM relay 1 and the MCM (B7).