DTC Troubleshooting
DTC Troubleshooting: P0A94 (48)
DTC P0A94:
DC-DC Converter Output Low Voltage
NOTE:
- Before you troubleshoot, record 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. Start the engine.
4. Check under these conditions:
- Headlights on high beam
- Blower fan at maximum speed
- Rear window defogger on
5. Let the engine idle for 2 minutes.
6. Monitor the OBD STATUS for DTC P0A94 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES -
Go to step 7.
NO -
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections, loose terminals, or damaged insulation at the DC-DC converter (DC-DC converter cable), the +B terminal (on the battery terminal fuse box), the MCM (VBU line), and the No. 1 BACK UP (15 A) fuse in the under-dash fuse/relay box. If the HDS indicates NOT COMPLETED, go to step 4.
7. Check for Pending or Confirmed DTCs with the HDS.
Is DTC U1221 or P0562 indicated?
YES -
Do the troubleshooting for DTC U1221 DTC Troubleshooting, or DTC P0562 DTC Troubleshooting.
NO -
Go to step 8.
8. Check the DC-DC CONVERTER INFORMATION in the DATA LIST with the HDS.
Does the HDS indicate NORMAL?
YES -
Go to step 9.
NO -
Check for poor connections, loose terminals, or damaged insulation at the DC-DC converter (DC-DC converter cable), the +B terminal (on the battery terminal fuse box), the MCM (VBU line), and the No. 1 BACK UP (15 A) in the under-dash fuse/relay box. If they are OK, replace the DC-DC converter Service and Repair, then go to step 21.
9. Turn the ignition switch to LOCK (0).
10. Check the battery terminal fuse box +B terminal (A) (BLK wire) connection.
Is the connection OK?
YES -
Go to step 11.
NO -
Repair the +B terminal connection, then go to step 21.
11. Turn the battery module switch OFF.
12. Remove the IPU cover IPU Cover Removal/Installation.
13. Remove the PCU lid Service and Repair.
14. Check the +B (A) connection on the phase motor current sensor.
Is the connection OK ?
YES -
Go to step 15.
NO -
Repair the connection, then go to step 21.
15. Remove the left cargo area side trim panel Interior Trim Removal / Installation - Cargo Areas.
16. Remove the left IPU module air duct IPU Module Air Duct Removal/Installation.
17. Check the body side DC-DC converter ground cable terminal connection (A).
Is the connection OK?
YES -
Go to step 18.
NO -
Repair the connection, then go to step 21.
18. Remove the IPU case IPU Case Removal/Installation.
19. Remove the front side IPU frame Service and Repair.
20. Check the PCU case side DC-DC converter ground cable terminal connection (A).
Is the connection OK?
YES -
Replace the DC-DC converter Service and Repair, then go to step 21.
NO -
Repair the connection, then go to step 21.
21. Reconnect all connectors.
22. If removed, reinstall the front side IPU frame Service and Repair.
23. If removed, reinstall the IPU case IPU Case Removal/Installation.
24. If removed, reinstall the PCU lid Service and Repair.
25. If removed, reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
26. If removed, reinstall the left IPU module air duct IPU Module Air Duct Removal/Installation.
27. If removed, reinstall the left cargo area side trim panel Interior Trim Removal / Installation - Cargo Areas.
28. Turn the ignition switch to ON (II).
29. Clear the DTC with the HDS.
30. Start the engine.
31. Check under these conditions:
- Headlights on high beam
- Blower fan at maximum speed
- Rear window defogger on
32. Let the engine idle for 2 minutes.
33. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0A94 indicated?
YES -
Check for poor connections or loose terminals at the DC-DC converter (DC-DC converter cable), the +B terminal (on the battery terminal fuse box), the MCM (VBU line), and the No. 1 BACK UP (15 A) fuse in the under-dash fuse/relay box, then go to step 1.
NO -
Go to step 34.
34. Monitor the OBD STATUS for DTC P0A94 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, check for poor connections or loose terminals at the DC-DC converter (DC-DC converter cable), the +B terminal (on the battery terminal fuse box), the MCM (VBU line), and the No. 1 BACK UP (15 A) fuse in the under-dash fuse/relay box, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 31.