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Home >> Lincoln >> 1994 >> Mark VIII V8-4.6L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Pinpoint Tests >> XB - Variable Control Relay Module (VCRM) >> XB65 - Check ACP SIG RTN For Short To Power
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XB65 - Check ACP SIG RTN For Short To Power



- Key "OFF".

- A/C Pressure (ACP) sensor disconnected.

- Variable Control Relay Module (VCRM) disconnected.

- Key "ON".

- Measure voltage between the ACP SIG RTN circuit at the ACP sensor vehicle harness connector and the battery negative post.

- Key "OFF".

- Was voltage less than 1.0 volt?

Yes -- Replace VCRM. 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)

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

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

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