Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) — 2016 workshop reference 3576

Refer to Wiring Diagrams Cell 54 for schematic and connector information.

Normal Operation and Fault Conditions

The externally controlled variable displacement compressor is electronically controlled by the PCM. The PCM pulse width modulates the ground to the externally controlled variable displacement compressor to change the displacement of the A/C compressor. REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

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.

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 N : P06A0

N1 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.

Source reference 3576

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.