DTC Troubleshooting
DTC Troubleshooting: P1446 (74)
DTC P1446:
Battery Module Individual Voltage Input Deviation
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- If the DTC cannot be cleared, do the troubleshooting for DTC U1204.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Remove the No. 1 BACK UP (15A) fuse from the under-dash fuse/relay box for at least 30 seconds, then reinstall it.
5. Turn the ignition switch to ON (II).
6. Make sure all electrical items (A/C, audio lights, etc.) are off.
7. Start the engine.
8. Check the SOC in the DATA LIST with the HDS.
9. Hold the engine speed between 3,500 and 4,000 rpm without load (in P or N) until the SOC increases to 75 %.
10. Let the engine idle for 3 minutes.
11. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1446 indicated?
YES -
Go to step 12.
NO -
Intermittent failure, the system is OK at this time.
12. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1570 indicated?
YES -
Do the troubleshooting for DTC P1570 DTC Troubleshooting.
NO -
Go to step 13.
13. Record the value of IMA BATTERY MODULE 1 VOLTAGE through IMA BATTERY MODULE 7 VOLTAGE in the DATA LIST with the HDS.
14. Turn the ignition switch to LOCK (0).
15. Turn the battery module switch OFF.
16. Remove the IPU cover IPU Cover Removal/Installation.
17. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
18. Disconnect MCM connector E (31P).
19. Using the IMA BATTERY MODULE VOLTAGE you recorded in step 13, compare the voltages between the following MCM connector terminals and the recorded IMA BATTERY MODULE VOLTAGES in the DATA LIST with the HDS.
- E22 and E10, compared to IMA BATTERY MODULE 1 VOLTAGE
- E10 and E11, compared to IMA BATTERY MODULE 2 VOLTAGE
- E11 and E1, compared to IMA BATTERY MODULE 3 VOLTAGE
- E1 and E2, compared to IMA BATTERY MODULE 4 VOLTAGE
- E18 and E19, compared to IMA BATTERY MODULE 5 VOLTAGE
- E19 and E8, compared to IMA BATTERY MODULE 6 VOLTAGE
- E8 and E9, compared to IMA BATTERY MODULE 7 VOLTAGE
Is there more than a 1.2 V difference between the MCM measurements and the DATA LIST measurements?
YES -
Go to step 35.
NO -
Replace the battery module Service and Repair, then go to step 20.
20. Reconnect all connectors.
21. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
22. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
23. Turn the ignition switch to ON (II).
24. Clear the DTC with the HDS.
25. Turn the ignition switch to LOCK (0).
26. Remove the No. 1 BACK UP (15A) fuse from the under-dash fuse/relay box for at least 30 seconds, then reinstall it.
27. Turn the ignition switch to ON (II).
28. Make sure all electrical items (A/C, audio, lights, etc.) are off.
29. Start the engine.
30. Check the SOC in the DATA LIST with the HDS.
31. Hold the engine speed between 3,500 and 4,000 rpm without load (in P or N) until the SOC increases to 75 %.
32. Let the engine idle for 3 minutes.
33. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1446 indicated?
YES -
Go to step 1.
NO -
Go to step 34.
34. Monitor the OBD STATUS for DTC P1446 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 33, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, go to step 4. If the HDS indicates NOT COMPLETED, go to step 25.
35. Reconnect all connectors.
36. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
37. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
38. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM.
39. Turn the ignition switch to LOCK (0).
40. Remove the No. 1 BACK UP (15A) fuse from the under-dash fuse/relay box for at least 30 seconds, then reinstall it.
41. Turn the ignition switch to ON (II).
42. Make sure all electrical items (A/C, audio, lights, etc.) are off.
43. Start the engine.
44. Check the SOC in the DATA LIST with the HDS.
45. Hold the engine speed between 3,500 and 4,000 rpm without load (in P or N) until the SOC increases to 75 %.
46. Let the engine idle for 3 minutes.
47. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1446 indicated?
YES -
If the MCM was updated, substitute a known-good MCM, and recheck. If the MCM was substituted, go to step 1.
NO -
Go to step 48.
48. Monitor the OBD STATUS for DTC P1446 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM. If any other Pending or Confirmed DTCs were indicated in step 47, go to the indicated DTC's troubleshooting.
NO -
- If the HDS indicates FAILED: If the MCM was updated, substitute a known-good MCM, and recheck. If the MCM was substituted, go to step 1.
- If the HDS indicates NOT COMPLETED: Go to step 39.