AR3 CHECK THE BATTERY VOLTAGE

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

• For vehicles with the 5.2L, REFER to: Charging System - 5.2L 32V Ti-VCT (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an overvoltage condition.

No	GO to AR3

Turn off all interior lights, exterior lights, and accessories. Start and run the engine at approximately 2,000 RPM for 3 minutes while monitoring the battery voltage.

Does the battery voltage rise to 15.5 volts or higher?

Yes	• For vehicles with the 2.3L EcoBoost (201kW/273PS), REFER to: Charging System - 2.3L EcoBoost (201kW/273PS) (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an overvoltage condition. • For vehicles with the 3.7L Duratec (227kW/301PS), REFER to: Charging System - 3.7L Duratec (227kW/301PS) (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an overvoltage condition. • For vehicles with the 5.0L 32V Ti-VCT, REFER to: Charging System - 5.0L 32V Ti-VCT (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an overvoltage condition. • For vehicles with the 5.2L, REFER to: Charging System - 5.2L 32V Ti-VCT (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an overvoltage condition.
No	• For the ACM, GO to AR4 • For the APIM, GO to AR5 • For the DACMC, GO to AR6 • For the FCIM, GO to AR7 • For the GPSM, GO to AR8

Yes

• For vehicles with the 2.3L EcoBoost (201kW/273PS), REFER to: Charging System - 2.3L EcoBoost (201kW/273PS) (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an overvoltage condition.

• For vehicles with the 3.7L Duratec (227kW/301PS), REFER to: Charging System - 3.7L Duratec (227kW/301PS) (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an overvoltage condition.

• For vehicles with the 5.0L 32V Ti-VCT, REFER to: Charging System - 5.0L 32V Ti-VCT (414-00 Charging System - General Information, Diagnosis and Testing). See Symptom Chart to diagnose an overvoltage condition.

• For the ACM, GO to AR4

• For the APIM, GO to AR5

• For the DACMC, GO to AR6

• For the FCIM, GO to AR7

• For the GPSM, GO to AR8

AR4 CHECK FOR CORRECT ACM (AUDIO FRONT CONTROL MODULE) OPERATION

Ignition OFF. Disconnect and inspect all the ACM connectors. Repair:

Corrosion (clean module pins or install new connectors or terminals) Damaged or bent pins (install new terminals or pins) Pushed-out pins (install new pins as necessary)

Reconnect the ACM connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ACM. REFER to: Audio Front Control Module (ACM) (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation).

Yes

CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ACM. REFER to: Audio Front Control Module (ACM) (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation).

Source reference 4247

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.