DTC P0A78: Motor Power Inverter (MPI) Module Internal Circuit Malfunction
- Before you troubleshoot, record all freeze data, and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- If the DTC cannot be cleared, do the troubleshooting for DTC U1204.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS (see DTC CLEAR ).
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1437 indicated?
YES -Do the troubleshooting for DTC P1437 (see DTC P1437: MOTOR POWER INVERTER (MPI) MODULE SHORT CIRCUIT ).
NO -Go to step 4.
- Start the engine.
- Monitor the OBD STATUS for P0A78 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES -Replace the MPI module (see MOTOR POWER INVERTER (MPI) MODULE REMOVAL/INSTALLATION ), 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.
- Turn the ignition switch to ON (II).
- 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.
- 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.