Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) — 2016 workshop reference 3456

Allow the A/C system to stabilize to the outside ambient temperature. Ignition ON. Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs). With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM ACP_PRESS PID.

Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID within ± 103 kPa (15 psi)?

Yes		IGNORE the Diagnostic Trouble Codes (DTCs). REFER to the Symptom Chart in this section.
No	GO to A2

A2 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF. Disconnect PCM, 2.3L C1551B, 3.7L C1381B or 5.0L and 5.2L C175B. Disconnect A/C pressure transducer C1260. Disconnect Turbocharger boost pressure sensor C1588 (if equipped). Disconnect Generator current sensor C1645. Ignition ON. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C1260-1		Ground
C1260-2		Ground
C1260-3		Ground

Is any voltage present?

Yes		REPAIR the circuit.
No	GO to A3

A3 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C1260-1		Ground
C1260-2		Ground
C1260-3		Ground

Are the resistances greater than 10,000 ohms?

Source reference 3456

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.