X66 - Check Ground Circuit to ACPSW

- Engine running.

- AC Pressure Switch (ACPSW) disconnected.

- Connect jumper wire between ACPSW circuit at the ACPSW vehicle harness connector and the battery negative post.

- Does the high speed fan now come on?

Yes -- Key "OFF". Service open GND circuit to ACPSW. Reconnect ACPSW. Re-evaluate symptom.

No -- Key "OFF". Go to X67. X67 - Check ACPSW Circuit Continuity to PCM