Test Notes

You should enter this pinpoint test only when directed here.

This pinpoint test is intended to diagnose:
- Harness circuits: ACR, HPS
- A/C relay
- High pressure switch
- Powertrain Control Module (PCM)

DESCRIPTION

A/C Relay
The A/C relay (ACR) is controlled by the PCM with an output signal. The signal acts as a circuit On/Off switch for the compressor magnetic clutch. The PCM will cut off the ACR during Wide Open Throttle (WOT) conditions, thus the relay is sometimes referred to as the Wide Open Throttle Air Conditioning Cutoff (WAC) relay.

High Pressure Switch
The high pressure switch closes when A/C pressure exceeds specified limits.