P0971
DTC P0971: CVT Start Clutch Pressure Control Valve Circuit High Voltage2004-2005 AT-PZEV Models
NOTE:
^ Record all freeze data and review General Troubleshooting Information before you troubleshoot.
^ This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
1. Clear the DTC with the HDS.
2. Check that DTC P0971 recurs.
Is DTC P0971 indicated?
YES- Go to step 6.
NO- Go to step 3.
3. Set the parking brake, and block the front wheels securely.
4. Start the engine, fully press the brake pedal, and shift to the D position.
5. Check that DTC P0971 recurs.
Is DTC P0971 indicated?
YES- Go to step 6.
NO- Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the solenoid harness connector, TCM and the CVT start clutch pressure control valve.
6. Turn the ignition switch OFF.
7. Disconnect the solenoid harness connector.
8. Measure the resistance between solenoid harness connector terminals No.4 and No.8.
Is there 3.8 - 6.8 Ohms?
YES- Go to step 9.
NO- Remove the lower valve body, and check for an open or a short in the solenoid harness. If the wire is OK, replace the CVT start clutch pressure control valve, then go to step 14
9. Disconnect TCM connectors B (24P) and C (17P).
10. Turn the ignition switch ON (II).
11. Check for the voltage between TCM connector terminals B24 and body ground, and between C7 and ground.
Is there voltage?
YES- Repair short to power in the wires between TCM connector terminals B24, C7 and the solenoid harness connector.
NO- Go to step 12.
12. Check for continuity between TCM connector terminals B24 and body ground, and between C7 and body ground.
Is there continuity?
YES- Repair short to ground in the wire between TCM connector terminal B24 and the solenoid harness connector, or between C7 and the connector.
NO- Go to step 13.
13. Check for continuity between TCM connector terminals A5 and body ground, A5 and body ground, A23 and body ground, and between A24 and body ground.
Is there continuity?
YES- Update the TCM if it does not have the latest software, or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.
NO- Repair open in the wires between TCM connector terminals A5, A23, A24, and ground (G101), or repair poor ground (G101).
14. Carry out step 1 thru 4, and check that DTC P0971 recurs.
Is DTC P097 1 indicated?
YES- Return to step 6 and recheck.
NO- The problem has been corrected.