Idle Stop Switch Signal Circuit Troubleshooting

Idle Stop Switch Signal Circuit Troubleshooting

1. Check the idle stop switch adjustment Idle Stop Switch Adjustment.

Is the adjustment OK?

YES -

Go to step 2.

NO -

Adjust the idle stop switch Idle Stop Switch Adjustment.

2. Jump the SCS with the HDS.

3. Disconnect PCM connector A (49P).

4. Turn the ignition switch to ON (II).

5. Release the brake pedal.

6. Measure the voltage between PCM connector terminal A15 and body ground.





Is there battery voltage?

YES -

Go to step 7.

NO -

Go to step 9.

7. Press the brake pedal.

8. Measure the voltage between PCM connector terminal A15 and body ground.





Is there 0 V?

YES -

The idle stop switch signal is OK.

NO -

Go to step 17.

9. Turn the ignition switch to LOCK (0).

10. Check the No.12 IMA (10A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 11.

NO -

Repair a short in the wire between the No. 12 IMA (10A) fuse, the idle stop switch 2P connector, and the PCM (A15), then replace the No. 12 IMA (10A) fuse.

11. Disconnect the idle stop switch 2P connector.

12. Turn the ignition switch to ON (II).

13. Measure the voltage between idle stop switch 2P connector terminal No. 2 and body ground.





Is there battery voltage?

YES -

Go to step 14.

NO -

Repair an open in the wire between the No. 12 IMA (10A) fuse and the idle stop switch 2P connector.

14. Turn the ignition switch to LOCK (0).

15. Release the brake pedal.

16. Check for continuity between idle stop switch 2P connector terminals No. 1 and No. 2.





Is there continuity?

YES -

Repair an open in the wire between the PCM (A15) and the idle stop switch.

NO -

Replace the idle stop switch Service and Repair.

17. Turn the ignition switch to LOCK (0).

18. Disconnect the idle stop switch 2P connector.

19. Press the brake pedal.

20. Check for continuity between idle stop switch 2P connector terminals No. 1 and No. 2.





Is there continuity?

YES -

Replace the idle stop switch Service and Repair.

NO -

Repair a short to power in the wire between the idle stop switch 2P connector and the PCM (A15).