Neutral Position Switch Signal Circuit Troubleshooting
Neutral Position Switch Signal Circuit TroubleshootingM/T model
1. Turn the ignition switch ON (II).
2. Shift the transmission to 1st gear.
3. Measure voltage between ECM connector terminals B16 and B20.
Is there battery voltage?
YES - Go to step 4.
NO - Go to step 6.
4. Shift the transmission to neutral position.
5. Measure voltage between ECM connector terminals B16 and B20.
Is voltage less than 1.0 V?
YES - The neutral position switch signal is OK.
NO - Go to step 12.
6. Turn the ignition switch OFF.
7. Disconnect the neutral position switch 2P connector.
8. Turn the ignition switch ON (II).
9. Measure voltage between ECM connector terminals B16 and B20.
Is there battery voltage?
YES - Replace the neutral position switch.
NO - Go to step 10.
10. Turn the ignition switch OFF.
11. Disconnect ECM connector B (25P).
12. Check for continuity between ECM connector terminal B16 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (B16) and the neutral position switch.
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.
13. Turn the ignition switch OFF.
14. Disconnect the neutral position switch 2P connector.
15. Check for continuity between neutral position switch 2P connector terminals No.1 and No.2 with the transmission in 1st gear.
Is there continuity?
YES - Go to step 15.
NO - Replace the neutral position switch.
16. Turn the ignition switch ON (II).
17. Measure voltage between neutral position switch 2P connector terminal No.2 and body ground.
Is there battery voltage?
YES - Repair open in the wire between the neutral position switch and G101.
NO - Repair open in the wire between the ECM (B16) and the neutral position switch.