P0721

DTC P0721: Range/Performance Problem in CVT Output Shaft (Driven Pulley) Speed Sensor Circuit
2005 Model

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. Raise the front of the vehicle, make sure it is securely supported, and allow the front wheels to rotate freely.
2. Start the engine, and shift into the D position. Push on the accelerator pedal until the rotational speed of the SECONDARY SHAFT SPEED is the same speed as indicated by the freeze data.
3. Monitor the SECONDARY SHAFT SPEED and DRIVEN PULLEY with the HDS in the data list.
Do the SECONDARY SHAFT SPEED and DRIVEN PULLEY signals fluctuate with the same speed?
YES- Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CVT output shaft (driven pulley) speed sensor and TCM
NO- Go to step 4.
4. Turn the ignition switch OFF.





5. Check for continuity between TCM connector terminals A4 and body ground, and between A17 and body ground.
Is there continuity?
YES- Go to step 6.
NO- Repair open in the wires between TCM connector terminals A4, A17, and ground (G101), or repair poor ground (G101).
6. Disconnect CVT output shaft (driven pulley) speed sensor connector.
7. Turn the ignition switch ON (II).





8. Check for voltage between CVT output shaft (driven pulley) speed sensor connector terminal No. 2 and body ground.
Is there about 5 V?
YES- Go to step 15.
NO- Go to step 9.
9. Turn the ignition switch OFF.
10. Disconnect TCM connector B (22P).





11. Check for continuity between CVT output shaft (driven pulley) speed sensor connector terminal No. 2 and body ground.
Is there continuity?
YES- Repair short to ground in the wire between TCM connector terminal B9 and the CVT output shaft (driven pulley) speed sensor.
NO- Go to step 12.
12. Connect TCM connector B (22P).
13. Turn the ignition switch ON (II).





14. Measure the voltage between TCM connector terminals B9 and A4 or A17.
Is there about 5 V?
YES- Repair open in the wire between TCM connector terminal B9 and the CVT output shaft (driven pulley) speed sensor.
NO- Check for loose or poor connections at TCM connector terminal B9. If the connection is OK, substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.





15. Measure the voltage between CVT output shaft (driven pulley) speed sensor connector terminal No. 1 and body ground.
Is there about 5 V?
YES- Go to step 22.
NO- Go to step 16.
16. Turn the ignition switch OFF.
17. Disconnect TCM connector B (22P).





18. Check for continuity between CVT output shaft (driven pulley) speed sensor connector terminal No. 1 and body ground.
Is there continuity?
YES- Repair short to ground in the wire between TCM connector terminal B21 and the CVT output shaft (driven pulley) speed sensor.
NO- Go to step 19.
19. Connect TCM connector B (22P).
20. Turn the ignition switch ON (II).





21. Measure the voltage between TCM connector terminals B21 and A4 or A17.
Is there about 5 V?
YES- Repair open in the wire between TCM connector terminal B21 and the CVT output shaft (driven pulley) speed sensor.
NO- Check for loose or poor connections at TCM connector terminal B21. If the connection is OK, substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.





22. Measure the voltage between CVT output shaft (driven pulley) speed sensor connector terminals No. 1 and No. 3.
Is there about 5 V?
YES- Replace the CVT output shaft (driven pulley) speed sensor, then go to step 23.
NO- Repair open in the wire between TCM connector terminal B8 and the CVT output shaft (driven pulley) speed sensor.
23. Clear the DTC with the HDS.
24. Test-drive the vehicle for several minutes under the same conditions as those indicated by the freeze data.
25. Check that DTC P0721 recurs.
Is DTC P0721 indicated?
YES- Return to step 1 and recheck.
NO- The problem has been corrected.