P1446
DTC P1446 (74): Battery Module Individual Voltage Input Deviation1. Turn the ignition switch ON (II).
2. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0A7F indicated?
YES - Do the troubleshooting for DTC P0A7F.
NO - Go to step 3.
3. Reset the MCM.
4. Start the engine, and wait 1 minute.
5. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1446 indicated?
YES - Go to step 6.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the battery module and the MCM.
6. Note the value of BATT. MDL VOLTAGE 1 to BATT. MDL VOLTAGE 10 in the DATA LIST with the HDS.
7. Turn the ignition switch OFF.
8. Turn the battery module switch OFF.
9. Remove the IPU lid.
10. Turn the ignition switch ON (II).
11. Disconnect MCM connector C (14P).
12. Measure voltage between the following MCM connector terminals, then compare the following value of BATT. MDL VOLTAGE 1 to BATT. MDL VOLTAGE 10 in the DATA LIST with the HDS.
^ C14 and C6, and value of BATT. MDL VOLTAGE 1
^ C6 and C13, and value of BATT. MDL VOLTAGE 2
^ C13 and C5, and value of BATT. MDL VOLTAGE 3
^ C5 and C12, and value of BATT. MDL VOLTAGE 4
^ C12 and C4, and value of BATT. MDL VOLTAGE 5
^ C3 and C9, and value of BATT. MDL VOLTAGE 6
^ C9 and C2, and value of BATT. MDL VOLTAGE 7
^ C2 and C8, and value of BATT. MDL VOLTAGE 8
^ C8 and C1, and value of BATT. MDL VOLTAGE 9
^ C1 and C7, and value of BATT. MDL VOLTAGE 10
Is there more than 1 V difference between the MCM measurement and the DATA LIST measurement?
YES - Go to step 20.
NO - Replace the battery module, and go to step 13.
13. Turn the ignition switch OFF.
14. Reconnect all connectors.
15. Reinstall the IPU lid, then turn the battery module switch ON.
16. Turn the ignition switch ON (II).
17. Reset the MCM.
18. Start the engine, and wait 1 minute.
19. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1446 is indicated, check for poor connections or loose terminals at the battery module 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.
20. Reinstall the IPU lid, then turn the battery module switch ON.
21. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
22. Start the engine, and wait 1 minute.
23. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1446 is indicated, check for poor connections or loose terminals at the battery module 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.