## Idle Control System

#### PSP Switch Signal Circuit Troubleshooting (cont'd)

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14. Measure voltage between ECM/PCM connector terminals A24 and E16.

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

Is there battery voltage?

YES | - Replace the PSP switch.
NO | - Go to step 15.

15. Turn the ignition switch OFF.
16. Disconnect ECM/PCM connector E (31P).
17. Check for continuity between body ground and ECM/PCM connector terminal E16.

ECM/PCM CONNECTOR E (31P)

Wire side of female terminals

Is there continuity?

YES | - Repair short in the wire between ECM/PCM (E16) and the PSP switch.
NO | - Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM.