AW4 CHECK THE MODULE VOLTAGE SUPPLY

REFER to: Charging System - 5.0L 32V Ti-VCT (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an under voltage condition.

• For vehicles with the 5.2L, REFER to: Charging System - 5.2L (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an under voltage condition.

Ignition OFF. Measure and record the voltage at the battery. Disconnect the audio system module setting DTC U3003:16. Ignition ON. Measure the voltage between the module setting DTC U3003:16 and ground. For the ACM, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C240A-1		Ground

For the APIM, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2383-1		Ground

For the audio DSP module, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2385B-14		Ground

For the DACMC, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C240A-1		Ground

For the FCIM, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2402A-7		Ground

Is the voltage within 0.2 volts of the recorded battery voltage?

Yes	GO to AW5
No	REPAIR the circuit for high resistance.

Source reference 4539

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.