DTC | Description | Fault Trigger Conditions |
|---|---|---|
P06A0 Variable A/C Compressor Control Circuit | The PCM senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. |
Possible Sources
Wiring, terminals or connectors A/C compressor PCM
Visual Inspection and Diagnostic Pre-checks
Inspect for loose or corroded PCM and A/C compressor connections.
PINPOINT TEST R : P06A0
R1 EXTERNALLY CONTROLLED VARIABLE DISPLACEMENT COMPRESSOR (EVDC) PERFORMANCE CHECK
NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).
NOTE: The performance check test is used to determine if the Externally Controlled Variable Displacement Compressor (EVDC) is able to change the displacement by measuring the amperage to the solenoid and monitoring the manifold pressure gauges soon after the air conditioning clutch is engaged.
Ignition OFF. Disconnect BJB fuse 42 (15A). Measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
BJB fuse 42 socket, component side | BJB fuse 42 socket, component side |
With a manifold gauge set connected, monitor the low side and high side pressures. Start the engine. Run the engine until it reaches normal operating temperature. Select the floor position on the HVAC controls. Set the temperature control to full warm and the blower to the highest setting. Set the A/C to off. Close all windows and doors. Run for 5 minutes to heat up the climate control housing. Monitor the multi meter and the manifold gauges. Select the PANEL position on the HVAC controls. Set the temperature control to full cold and the blower to the highest setting. Set the recirculated air mode to on. Set the A/C to on. Record the highest amperage measurement and the A/C pressures.
Did the amperage initially increase approximately 0.8A, and did the low side pressure decrease and the high side pressure increase and after a few minutes did the amperage and high side pressure decrease and low side pressure increase?
Yes | The Externally Controlled Variable Displacement Compressor (EVDC) is able to change the displacement. CHECK refrigerant charge amount. REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging (412-00 Climate Control System - General Information, General Procedures). | |
|---|---|---|
No | GO to R2 | |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.