Idle Stop Switch Signal Circuit Troubleshooting
Idle Stop Switch Signal Circuit TroubleshootingCVT model
1. Check the idle stop switch position.
Is the position OK?
YES - Go to step 2.
NO - Check the idle stop switch adjustment.
2. Turn the ignition switch ON (II).
3. Press the brake pedal.
4. Measure voltage between the ECM connector terminals A31 and B20.
Is there battery voltage?
YES - Go to step 5.
NO - Go to step 7.
5. Release the brake pedal.
6. Measure voltage between ECM connector terminals A31 and B20.
Is voltage less than 1.0 V?
YES - Idle Stop Switch signal is OK.
NO - Go to step 14.
7. Turn the ignition switch OFF.
8. Disconnect the Idle Stop Switch switch 2P connector.
9. Turn the ignition switch ON (II).
10. Measure voltage between ECM connector terminals A31 and B20.
Is there battery voltage?
YES - Replace the idle stop switch.
NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Disconnect ECM connector A (32P).
13. Check for continuity between ECM connector terminal A31 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (A31) and the idle stop 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.
14. Turn the ignition switch OFF.
15. Disconnect the idle stop switch 2P connector.
16. Check for continuity between the idle stop switch 2P connector terminals No.1 and No.2.
Is there continuity?
YES - Go to step 17.
NO - Replace the idle stop switch.
17. Turn the ignition switch ON (II).
18. Measure voltage between idle stop switch 2P connector terminal No.2 and body ground.
Is there battery voltage?
YES - Repair open in the wire between the idle stop switch and G402.
NO - Repair open in the wire between the ECM (A31) and the idle stop switch.