XB91 - Check If PCM Is Receiving and Recognizing ACCS Input
- Key "OFF".
- Remove test lamp.
- Reconnect A/C clutch.
- A/C "ON".
- Perform Key On Engine Off Self-Test. Quick Test Appendix (Detailed Testing Instructions)
- Is Key On Engine Off Diagnostic Trouble Code (DTC) 539 present?
Yes -- The Powertrain Control Module (PCM) is receiving and recognizing the AC Clutch Supply (ACCS) input. Go to XB92 (to verify the Variable Control Relay Module (VCRM) is receiving the A/C demand voltage). XB92 - Check A/C Demand Switch Voltage at VCRM
No -- The PCM is not receiving or recognizing the ACCS input. Go to XB96. XB96 - Check For A/C Demand Voltage at A/C Pressure Switch