KM30 - Check A/C Input Circuitry

- A/C demand switch to "A/C ON".

- Perform Key On Engine Off Self-Test. Quick Test Appendix (Detailed Testing Instructions)

- Is Diagnostic Trouble Code (DTC) 539 present?

Yes -- The Powertrain Control Module (PCM) is receiving and recognizing the A/C input on Pin 10. Return to Diagnosis by Symptom (Diagnostic Routines) for other possible causes of a low idle.

No -- A/C demand switch "OFF". Go to KM31. KM31 - Check A/C Input Circuit