A/T Gear Position Signal Circuit Troubleshooting
A/T Gear Position Signal Circuit TroubleshootingCVT model
1. Turn the ignition switch ON (II).
2. Look at the A/T gear position indicator and select each position.
Does the indicator light properly?
YES - Go to step 3.
NO - Check the A/T gear position indicator.
3. Turn the ignition switch OFF.
4. Remove the gauge assembly from the dashboard. Disconnect the gauge assembly 22P connector.
5. Disconnect TCM connector A (31P).
6. Turn the ignition switch ON (II).
7. Measure voltage between ECM connector terminals A24 and B13 while the transmission is not in N or P position.
Is there battery voltage?
YES - Go to step 12.
NO - Go to step 8.
8. Turn the ignition switch OFF.
9. Wait for 1 minute. If the radiator fan is running, wait for 1 minute after it stops.
10. Disconnect ECM connector B (24P).
11. Check for continuity between ECM connector terminal B13 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (B13) and the A/T gear position sensor, TCM, or the gauge assembly.
NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
12. Turn the ignition switch OFF.
13. Reconnect the gauge assembly 22P connector.
14. Reconnect TCM connector A (31P).
15. Turn the ignition switch ON (II).
16. Measure voltage between ECM connector terminals A24 and B13 with the transmission in N or P position.
Is there less than 1.0 V?
YES - Go to step 17.
NO - Repair open in the wire between the ECM (B13) and the A/T gear position sensor.
17. Measure voltage between ECM connector terminals A24 and B12 with the transmission in D position.
Is there less than 1.0 V?
YES - Go to step 18.
NO - Repair open in the wire between the ECM (B12) and the A/T gear position sensor.
18. Measure voltage between ECM connector terminals A24 and B12 with the transmission in N or P.
Is there battery voltage?
YES - Go to step 19.
NO - Repair short in the wire between the ECM (B12) and the A/T gear position sensor.
19. Measure voltage between ECM connector terminals A24 and B11 with the transmission in R position.
Is there less than 1.0 V?
YES - Go to step 20.
NO - Repair open in the wire between the ECM (B11) and the A/T gear position sensor.
20. Measure voltage between ECM connector terminals A24 and B11 with the transmission in N or P.
Is there battery voltage?
YES - The A/T gear position signal is OK.
NO - Repair short in the wire between the ECM (B11) and the A/T gear position sensor.