Charging System Indicator Troubleshooting
Charging System Indicator Circuit Troubleshooting1. Turn the ignition switch ON (II) and watch the charging system light.
Does the charging system indicator come on and stay on?
YES- Go to step 2.
NO- Go to step 3.
2. Start the engine.
Does the charging system indicator go off?
YES- Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the battery module and the MCM.
NO- Go to step 11.
3. Turn the ignition switch ON (II), and watch the IMA system indicator.
Does the IMA indicator come on, even briefly?
YES- Go to step 4.
NO- Do the IMA system indicator circuit troubleshooting.
4. Turn the ignition switch OFF.
5. Turn the battery module switch OFF.
6. Remove the IPU lid.
7. Connect DC-DC converter 8P connector terminal No. 2 to body ground with a jumper wire.
8. Turn the ignition switch ON (II).
Does the charging system indicator come on?
YES- Replace the DC-DC converter.
NO- Go to step 9.
9. Check the No. 4 ECU (ECM) (7.5A) fuse.
Is fuse OK?
YES- Go to step 10.
NO- Check for short or open in the wire between No. 4 ECU (ECM) (7.5A) fuse and the DC-DC converter.
10. Check the charging system bulb.
Is charging system bulb OK ?
YES- Repair open in the wire between the DC-DC converter and the gauge assembly.
NO- Replace the bulb.
11. Watch the IMA system indicator light.
Are any DTCs indicated?
YES-,Go to the DTC Troubleshooting Index.
NO- Go to step 12.
12. Turn the ignition switch OFF.
13. Check the 12 V battery.
Is the 12 V battery OK?
YES- Go to step 14.
NO- Charge or replace the 12 V battery.
14. Turn the ignition switch OFF.
15. Turn the battery module switch OFF.
16. Remove the IPU lid.
17. Disconnect the DC-DC converter 8P connector.
18. Check for continuity between DC-DC converter 8P connector terminal No. 2 and body ground.
Is there continuity?
YES- Repair short in the wire between the DC-DC converter and the gauge assembly.
NO- Go to step 19.
19. Check for continuity between the DC-DC converter 8P connector terminal No. 6 and body ground.
Is there continuity?
YES- Substitute a known-good MCM, and recheck. If the symptom/indication goes away, replace the original MCM.
NO- Go to step 20.
20. Disconnect MCM connector A (32P).
21. Check for continuity between DC-DC converter 8P connector terminal No. 6 and body ground.
Is there continuity?
YES- Repair short in the wire between the DC-DC converter and the MCM (A27).
NO- Go to step 22.
22. Turn the ignition switch ON (II).
23. Measure voltage between body ground and DC-DC converter terminal No. 1.
Is there battery voltage?
YES- Go to step 24.
NO- Repair open in the wire between the DC-DC converter and No. 4 ECU (ECM) (7.5A) fuse
24. Turn the battery module switch ON.
25. Turn the ignition switch ON (II).
26. Measure voltage between the two terminals of the junction board.
Is there 90 - 215 V?
YES- Replace the DC-DC converter.
NO- Replace the battery module.