DTC Troubleshooting
DTC Troubleshooting: P0502 (36)
DTC P0502:
Problem in CVT Speed Sensor Circuit
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the 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. Check for proper vehicle speed sensor installation Service and Repair. If the sensor is installed incorrectly, reinstall the sensor correctly, then go to step 26.
2. Turn the ignition switch to ON (II).
3. Clear the DTC with the HDS.
4. Block the rear wheels, and raise the front of the vehicle. Make sure it is securely supported, and allow the front wheels to rotate freely, or raise the vehicle on a lift.
5. Start the engine, disable the VSA by pressing the VSA OFF button, run the vehicle with the shift lever in D, and the engine speed at 4,500 rpm or higher, then release the accelerator without pressing it again, for at least 6 seconds. Slow down and stop the wheels.
6. Monitor the OBD STATUS for P0502 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES -
Go to step 7.
NO -
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the PCM and the vehicle speed sensor. If the HDS indicates NOT COMPLETED, go to step 5.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector C (49P).
10. Check for continuity between PCM connector terminal C44 and body ground, and between PCM connector terminal C49 and body ground.
Is there continuity?
YES -
Go to step 11.
NO -
Repair open in the wires between PCM connector terminals C44, C49, and body ground (G101), or repair poor body ground (G101), then go to step 26.
11. Connect PCM connector C (49P).
12. Disconnect the vehicle speed sensor 3P connector.
13. Turn the ignition switch to ON (II).
14. Measure the voltage between vehicle speed sensor 3P connector terminal No. 1 and body ground.
Is there about 5 V?
YES -
Go to step 19.
NO -
Go to step 15.
15. Turn the ignition switch to LOCK (0).
16. Jump the SCS line with the HDS.
17. Disconnect PCM connector B (49P).
18. Check for continuity between PCM connector terminal B19 and vehicle speed sensor 3P connector terminal
No. 1.
Is there continuity?
YES -
Go to step 32.
NO -
Repair an open in the wire between PCM connector terminal B19 and the vehicle speed sensor 3P connector, then go to step 26.
19. Measure the voltage between vehicle speed sensor 3P connector terminals No. 2 and No. 3.
Is there about 5 V?
YES -
Replace the vehicle speed sensor Service and Repair, then go to step 26.
NO -
Go to step 20.
20. Turn the ignition switch to LOCK (0).
21. Jump the SCS line with the HDS.
22. Disconnect PCM connector B (49P).
23. Check for continuity between vehicle speed sensor 3P connector terminal No. 2 and body ground.
Is there continuity?
YES -
Repair a short to body ground in the wire between PCM connector terminal B38 and the vehicle speed sensor 3P connector, then go to step 26.
NO -
Go to step 24.
24. Check for continuity between PCM connector terminal B34 and vehicle speed sensor 3P connector terminal No. 3.
Is there continuity?
YES -
Go to step 25.
NO -
Repair an open in the wire between the vehicle speed sensor 3P connector and PCM connector terminal B34, then go to step 26.
25. Check for continuity between PCM connector terminal B38 and vehicle speed sensor 3P connector terminal No. 2.
Is there continuity?
YES -
Go to step 32.
NO -
Repair an open in the wire between PCM connector terminal B38 and the vehicle speed sensor 3P connector, then go to step 26.
26. Reconnect all connectors.
27. Turn the ignition switch to ON (II).
28. Clear the DTC with the HDS.
29. Start the engine, disable the VSA by pressing the VSA OFF button, run the vehicle with the shift lever in D, until the vehicle speed reaches 37 mph(60 km/h), then slow down and stop the wheels.
30. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0502 indicated?
YES -
Check for poor connections or loose terminals between the vehicle speed sensor and the PCM, then go to step 1.
NO -
Go to step 31.
31. Monitor the OBD STATUS for P0502 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 30, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between the vehicle speed sensor and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 29.
32. Reconnect all connectors.
33. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.
34. Start the engine, disable the VSA by pressing the VSA OFF button, run the vehicle with the shift lever in D, until the vehicle speed reaches 37 mph(60 km/h), then slow down and stop the wheels.
35. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0502 indicated?
YES -
Check for poor connections or loose terminals between the vehicle speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 34. If the PCM was substituted, go to step 2.
NO -
Go to step 36.
36. Monitor the OBD STATUS for P0502 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 35, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between the vehicle speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 34. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 34.