Fault Code 22

Fault Code 22

Compressor Lock Signal (12 cyl. vehicles only)
- Sensor, harness or Air Conditioning Control Module (A/CCM) open circuit.
- Sensor, harness or (A/CCM) short circuit to ground.

The compressor lock sensor provides an a.c. signal proportional to engine speed. As engine speed increases the a.c. signal voltage value will increase.

A voltage check can be carried out on the sensor and should read approximately 0.5 V a.c. while the compressor is ON and 0V while the compressor is OFF, measured between pin 26 (12-way connector) and pin 19 (22-way connector) A/CCM.

If the reading is 0 V while the compressor is ON, suspect the sensor or the sensor harness (open circuit or short circuit to ground).

Check the resistance between pins 1 and 2 of the compressor lock sensor, value should be 190 Ohm ± 20%. If the resistance measured falls outside the limits, renew the compressor lock sensor.

Inspect the sensor harness for open circuit or short circuit to ground. repair as necessary.

If the sensor and harness appear correct, suspect the A/CCM.