DTC Troubleshooting: P0A64 (28)
DTC Troubleshooting: P0A64 (28)
DTC P0A64:
W Phase Motor Current Sensor Circuit Low Voltage
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 P0A64 indicated?
YES -
Go to step 4.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MCM and the phase motor current sensor.�
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P06B1 indicated?
YES -
Do the troubleshooting for DTC P06B1 P06B1.
NO -
Go to step 5.
5. Turn the ignition switch to LOCK (0).
6. Turn the battery module switch OFF.
7. Do the 12 volt battery terminal disconnection procedure Procedures.
8. Remove the IPU cover IPU Cover Removal/Installation.
9. Remove the PCU lid, the PCU busplate, and the PCU cover Service and Repair.
10. Remove the bolts (A), and disconnect the MCM connector E (B), then move the MCM aside.
11. Disconnect the four IMA motor power cables (A) from the phase motor current sensor, then wrap the end of the 12 volt power cable (B) with insulating tape.
NOTE: Check the position of the U phase, the V phase, and the W phase cables before disconnecting them.
12. Remove the bolts (A) and the terminal cover (B).
13. Disconnect the phase motor current sensor 9P connector (A).
14. Connect phase motor current sensor 9 P connector terminals No. 1 and No. 4 with a jumper wire.
15. Reconnect MCM connector E (31P).
16. Do the 12 volt battery terminal reconnection procedure Procedures.
17. Turn the ignition switch to ON (II).
18. Check the W PHASE MOTOR CURRENT SENSOR and the W PHASE MOTOR CURRENT SENSOR VOLTAGE in the DATA LIST with the HDS.
Is there 4.5 V and 370 A or more indicated?
YES -
Replace the phase motor current sensor Service and Repair, then go to step 30.
NO -
Go to step 19.
19. Turn the ignition switch to LOCK (0).
20. Disconnect the jumper wire from the phase motor current sensor 9P connector.
21. Turn the ignition switch to ON (II).
22. Measure the voltage between phase motor current sensor 9P connector terminals No. 1 and No. 9.
Is there about 5 V?
YES -
Go to step 23.
NO -
Go to step 27.
23. Turn the ignition switch to LOCK (0).
24. Disconnect MCM connector C (22P).
25. Check for continuity between MCM connector terminal C21 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the phase motor current sensor 9P connector and the MCM (C21), then go to step 30.
NO -
Go to step 26.
26. Check for continuity between phase motor current sensor 9P connector terminal No. 4 and MCM connector terminal C21.
Is there continuity?
YES -
Go to step 40.
NO -
Repair an open in the wire between the phase motor current sensor 9P connector and the MCM (C21), then go to step 30.
27. Turn the ignition switch to LOCK (0).
28. Disconnect MCM connector C (22P).
29. Check for continuity between phase motor current sensor 9P connector terminal No. 1 and MCM connector terminal C22.
Is there continuity?
YES -
Go to step 40.
NO -
Repair an open in the wire between the phase motor current sensor 9P connector and the MCM (C22), then go to step 30.
30. Reconnect all connectors.
31. Reinstall the terminal cover.
32. Reconnect the four IMA motor power cables to the phase motor current sensor.
NOTE: Make sure the cables are correctly positioned before you reconnect them.
33. Reinstall the MCM Service and Repair.
34. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
35. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
36. Do the 12 volt battery terminal reconnection procedure Procedures.
37. Turn the ignition switch to ON (II).
38. Clear the DTC with the HDS.
39. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0A64 indicated?
YES -
Check for poor connections or loose terminals at the MCM and the phase motor current sensor, then go to step 1.
NO -
Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�
40. Reconnect all connectors.
41. Reinstall the terminal cover.
42. Reconnect the four IMA motor power cables to the phase motor current sensor.
NOTE: Make sure the cables are correctly positioned before you reconnect them.
43. Reinstall the MCM Service and Repair.
44. Reinstall the PCU cover, the PCU busplate, and the PCU lid Service and Repair.
45. Reinstall the IPU cover IPU Cover Removal/Installation, then turn the battery module switch ON.
46. Do the 12 volt battery terminal reconnection procedure Procedures.
47. Update the MCM if it does not have the latest software Testing and Inspection, or substitute a known-good MCM.
48. Turn the ignition switch to ON (II).
49. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0A64 indicated?
YES -
Check for poor connections or loose terminals at the MCM and the phase motor current sensor. If the MCM was updated, substitute a known-good MCM, then recheck. If the MCM was substituted, go to step 1.
NO -
If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM Service and Repair. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.�