XB64 - Check ACP SIG RTN For Short To VREF

- Key "OFF".

- A/C Pressure (ACP) sensor disconnected.

- Variable Control Relay Module (VCRM) disconnected.

- Measure resistance between the ACP SIG RTN circuit and the ACP VREF circuit at the ACP sensor vehicle harness connector.

- Is resistance greater than 10,000 ohms?

Yes -- Go to XB65. XB65 - Check ACP SIG RTN For Short To Power

No -- Service ACP SIG RTN short to ACP VREF. Reconnect all components. Clear continuous memory. Clearing Diagnostic Trouble Codes

Attempt to reset Diagnostic Trouble Code (DTC) 579 (Refer to XB52 for procedure only). XB52 - Clear and Attempt to Regenerate DTC

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)