DTC Troubleshooting
DTC Troubleshooting: P0971 (32)
DTC P0971:
CVT Start Clutch Pressure Control Valve Circuit High Voltage
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information How To Troubleshoot The CVT System.
- This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Shift the shift lever to D while pressing the brake pedal, and keep the shift lever in D for at least 1 second.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0971 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the PCM and the CVT clutch pressure control solenoid valve.�
5. Turn the ignition switch to LOCK (0).
6. Disconnect the solenoid harness connector.
7. Measure the resistance between solenoid harness connector terminals No. 4 and No. 8.
Is there 3.8-6.8 Ohms?
YES -
Go to step 11.
NO -
Go to step 8.
8. Remove the lower valve body Overhaul.
9. Disconnect the CVT clutch pressure control solenoid valve connector.
10. Measure the resistance between CVT clutch pressure control solenoid valve connector terminals No. 1 and No. 2.
Is there 3.8-6.8 Ohms?
YES -
Replace the solenoid harness CVT Clutch Pressure Control Solenoid Valve Replacement, then go to step 18.
NO -
Replace the CVT clutch pressure control solenoid valve CVT Clutch Pressure Control Solenoid Valve Replacement, then go to step 18.
11. Jump the SCS line with the HDS.
12. Disconnect PCM connector B (44P).
13. Turn the ignition switch to ON (II).
14. Measure the voltage between PCM connector terminal B25 and body ground, and between PCM connector terminal B41 and body ground.
Is there voltage?
YES -
Repair a short to power in the wire between PCM connector terminal B25 and solenoid harness connector terminal No. 4, or repair a short to power in the wire between PCM connector terminal B41 and solenoid harness connector terminal No. 8, then go to step 18.
NO -
Go to step 15.
15. Turn the ignition switch to LOCK (0).
16. Check for continuity between PCM connector terminal B25 and body ground, and between PCM connector terminal B41 and body ground.
Is there continuity?
YES -
Repair a short to body ground in the wire between PCM connector terminal B25 and solenoid harness connector terminal No. 4, or repair a short to body ground in the wire between PCM connector terminal B41 and solenoid harness connector terminal No. 8, then go to step 18.
NO -
Go to step 17.
17. Check for continuity between PCM connector terminals B6, B40, and body ground individually.
Is there continuity?
YES -
Go to step 24.
NO -
Repair an open in the wires between PCM connector terminals B6, B40, and body ground (G101), or repair poor body ground (G101).�
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II).
20. Clear the DTC with the HDS.
21. Start the engine. Shift the shift lever to D while pressing the brake pedal, and keep the shift lever in D for at least 1 second.
22. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0971 indicated?
YES -
Check for poor connections or loose terminals between the PCM and the CVT clutch pressure control solenoid valve, then go to step 1.
NO -
Go to step 23.
23. Monitor the OBD STATUS for P0971 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 22, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between the PCM and the CVT clutch pressure control solenoid valve, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 21.
24. Reconnect all connectors.
25. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Initial Inspection and Diagnostic Overview.
26. Start the engine. Shift the shift lever to D while pressing the brake pedal, and keep the shift lever in D for at least 1 second.
27. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0971 indicated?
YES -
Check for poor connections or loose terminals between the PCM and the CVT clutch pressure control solenoid valve. If the PCM was updated, substitute a known-good PCM Initial Inspection and Diagnostic Overview, then go to step 26. If the PCM was substituted, go to step 1.
NO -
Go to step 28.
28. Monitor the OBD STATUS for P0971 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 27, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between the PCM and the CVT clutch pressure control solenoid valve. If the PCM was updated, substitute a known-good PCM Initial Inspection and Diagnostic Overview, then go to step 26. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 26.