P1629

DTC P1629 (79): Battery Current Sensor Circuit Malfunction

NOTE: If DTC P0A1B is stored at the same time as DTC P1629, troubleshoot DTC P1629 first, then recheck for DTC P0A1B.

1. Turn the ignition switch ON (II), and wait 10 seconds.
2. Check the BATTERY CURRENT SENSOR SUPPLY VOLTAGE (POSITIVE) in the DATA LIST with the HDS.
Is there about 9.5 - 14.5 V?
YES - Go to step 3.
NO - Go to step 4.

3. Check the BATTERY CURRENT SENSOR SUPPLY VOLTAGE (NEGATIVE) in the DATA LIST with the HDS.
Is there about 9.5 - 14.5 V?
YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the battery current sensor and the MCM.
NO - Go to step 4.

4. Turn the ignition switch OFF.
5. Turn the battery module switch OFF.
6. Remove the IPU lid.
7. Disconnect the battery current sensor 3P connector.
8. Disconnect MCM connector A (31P).
9. Check for continuity between body ground and MCM connector terminals A8 and A9 individually.





Is there continuity?
YES - Repair short in the wire between the battery current sensor and the MCM (A8, A9), then go to step 10.
NO - Go to step 17.

10. Turn the ignition switch OFF.
11. Reconnect all connectors.
12. Reinstall the IPU lid, then turn the battery module switch ON.
13. Turn the ignition switch ON (II).
14. Reset the MCM.
15. Turn the ignition switch ON (II), and wait 10 seconds.
16. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1629 is indicated, check for poor connections or loose terminals at the battery current sensor and the MCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.

17. Reinstall the IPU lid, then turn the battery module switch ON.
18. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
19. Turn the ignition switch ON (II), and wait 10 seconds.
20. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1629 is indicated, check for poor connections or loose terminals at the battery current sensor and the MCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM.