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 - Do the A/T gear position indicator input test.
3. Turn the ignition switch OFF.
4. Remove the gauge assembly from the dashboard. Disconnect the gauge assembly 10P connector.
5. Disconnect TCM connector A (26P).
6. Turn the ignition switch ON (II).
7. Measure voltage between ECM connector terminals B14 and B20 with the transmission not in N or P position.
Is there battery voltage?
YES - Go to step 11.
NO - Go to step 8.
8. Turn the ignition switch OFF.
9. Disconnect ECM connector B (24P).
10. Check for continuity between ECM connector terminal B14 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (B14) and the A/T gear position switch, the TCM (A10), 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.
11. Turn the ignition switch OFF.
12. Reconnect the gauge assembly 10P connector.
13. Reconnect TCM connector A (26P).
14. Turn the ignition switch ON (II).
15. Measure voltage between ECM connector terminals B14 and B20 with the transmission in N or P position.
Is there less than 1.0 V?
YES - Go to step 16.
NO - Repair open in the wire between the ECM (B14) and the A/T gear position switch.
16. Measure voltage between ECM connector terminals B16 and B20 with the transmission in D position.
Is there less than 1.0V?
YES - Go to step 17.
NO - Repair open in the wire between the ECM (B16) and the A/T gear position switch.
17. Measure voltage between ECM connector terminals B16 and B20 with the transmission in N or P position.
Is there battery voltage?
YES - Go to step 18.
NO - Repair short in the wire between the ECM (B16) and the A/T gear position switch.
18. Measure voltage between ECM connector terminals B20 and B24 with the transmission in R position.
Is there less than 1.0 V?
YES - Go to step 19.
NO - Repair open in the wire between the ECM (B24) and the A/T gear position switch.
19. Measure voltage between ECM connector terminals B20 and B24 with the transmission in N or P position.
Is there battery voltage?
YES - The A/T gear position signal is OK.
NO - Repair short in the wire between the ECM (B24) and the A/T gear position switch.