DTC Troubleshooting

DTC Troubleshooting: P0A78 (32)

DTC P0A78:

Motor Power Inverter (MPI) Module Internal Circuit Malfunction

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. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1437 indicated?

YES -

Do the troubleshooting for DTC P1437 P1437.

NO -

Go to step 4.

4. Start the engine.

5. Monitor the OBD STATUS for P0A78 in the DTCs MENU with the HDS.

Does the HDS indicate FAILED?

YES -

Replace the MPI module Service and Repair, then go to step 6.

NO -

If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.

6. Turn the ignition switch to ON (II).

7. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0A78 indicated?

YES -

Check for poor connections or loose terminals at the MPI module, then go to step 1.

NO -

Go to step 8.

8. Monitor the OBD STATUS for DTC P0A78 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 7, go to the indicated DTC's troubleshooting.

NO -

If the HDS indicates FAILED, go to step 1. If the HDS indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.