P0502

DTC P0502: Problem in Vehicle Speed Sensor Circuit (No Signal Input)
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 speedometer indicates 12 mph (20 km/h).
3. Check the VEHICLE SPEED SENSOR with the HDS in the data list.
Is the VEHICLE SPEED SENSOR 2 km/h or less?
YES- Go to step 4.
NO- Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the vehicle speed sensor and TCM.
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 vehicle speed sensor connector.
7. Turn the ignition switch ON (II).
8. Check for voltage between vehicle speed sensor connector terminal No. 3 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 vehicle speed sensor connector terminal No. 3 and body ground.
Is there continuity?
YES - Repair short to ground in the wire between TCM connector terminal B5 and the vehicle 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 B5 and A4 or A17.
Is there about 5 V?
YES- Repair open in the wire between TCM connector terminal B5 and the vehicle speed sensor.
NO- Check for loose or poor connections at TCM connector terminal B5. 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 vehicle speed sensor connector terminal No. 2 and body ground.
Is there battery voltage?
YES- Go to step 16.
NO- A short or an open in the wire between the under-dash fuse/relay box and vehicle speed sensor.





16. Measure the voltage between vehicle speed sensor connector terminals No. 1 and No. 2.
Is there battery voltage?
YES- Replace the vehicle speed sensor, then go to step 17.
NO- Repair open in the wire between the vehicle speed sensor and ground (G101), or repair poor ground (G101).
17. Clear the DTC with the HDS.
18. Test-drive the vehicle for several minutes under the same conditions as those indicated by the freeze data.
19. Check that DTC P0502 recurs.
Is DTC P0502 indicated?
YES- Return to step 1 and recheck.
NO- The problem has been corrected.