Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) — 2016 workshop reference 3521

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The PCM controls the A/C compressor clutch field coil based on messages received from the BCM over the HS-CAN. When the FCIM determines it is necessary to activate the A/C compressor due to driver request or automatic climate control settings, the FCIM sends a message to the BCM over the MS-CAN, the BCM then sends a message to the PCM to activate the A/C compressor.

An internal failure of the PCM, BCM or FCIM, or a failure in the MS-CAN or HS-CAN, causes the PCM to set a DTC.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
	P193E A/C Clutch Request Signal	This DTC sets when the PCM does not receive the A/C enable request from the BCM.

DTC

Description

Fault Trigger Conditions

P193E A/C Clutch Request

Signal

This DTC sets when the PCM does not receive the A/C enable request from the BCM.

Possible Sources

Network concerns BCM PCM FCIM

PINPOINT TEST S : P193E

S1 VERIFY THE CUSTOMER CONCERN

Ignition ON. Verify there is an observable symptom present.

Is an observable symptom present?

Yes		GO to S2
No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

S2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, carry out the Network Test.

Do the BCM, PCM and the FCIM pass the Network Test?

Yes		GO to S3
No	DIAGNOSE the BCM, PCM or FCIM does not communicate with the diagnostic scan tool. REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).

S3 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION)

Source reference 3521

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.