Charging System - 5.0L 32V Ti-VCT — 2016 workshop reference 4040

Positive Lead	Measurement / Action	Negative Lead
Charging System - 5.0L 32V Ti-VCT — original illustration 1, reference 4040Original colors & callouts · Select to enlarge		Charging System - 5.0L 32V Ti-VCT — original illustration 2, reference 4040Original colors & callouts · Select to enlarge

Positive Lead

Measurement /

Action

Negative Lead

Charging System - 5.0L 32V Ti-VCT — original illustration 1, reference 4040Original colors & callouts · Select to enlarge

Charging System - 5.0L 32V Ti-VCT — original illustration 2, reference 4040Original colors & callouts · Select to enlarge

Using a diagnostic scan tool, view the PCM PID VPWR.

Does the PID accurately display battery voltage within ±0.5 volt of the recorded battery voltage?

Yes	GO to B8
No	REPAIR high resistance or loose connections in the affected PCM power circuit(s).

B8 CHECK PCM (POWERTRAIN CONTROL MODULE) SUPPLY VOLTAGE CIRCUITS

Ignition OFF. Disconnect BJB PCM power relay. Disconnect PCM C175B. Connect a fused jumper wire:

Positive Lead	Measurement / Action	Negative Lead
BJB PCM Relay pin 3 Charging System - 5.0L 32V Ti-VCT — original illustration 3, reference 4040Original colors & callouts · Select to enlarge		BJB PCM Relay pin 5 Charging System - 5.0L 32V Ti-VCT — original illustration 4, reference 4040Original colors & callouts · Select to enlarge

Positive Lead

Measurement /

Action

Negative Lead

BJB PCM Relay pin 3

Charging System - 5.0L 32V Ti-VCT — original illustration 3, reference 4040Original colors & callouts · Select to enlarge

BJB PCM Relay pin 5

Charging System - 5.0L 32V Ti-VCT — original illustration 4, reference 4040Original colors & callouts · Select to enlarge

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
Charging System - 5.0L 32V Ti-VCT — original illustration 5, reference 4040Original colors & callouts · Select to enlarge		Charging System - 5.0L 32V Ti-VCT — original illustration 6, reference 4040Original colors & callouts · Select to enlarge

Positive Lead

Measurement /

Action

Negative Lead

Charging System - 5.0L 32V Ti-VCT — original illustration 5, reference 4040Original colors & callouts · Select to enlarge

Charging System - 5.0L 32V Ti-VCT — original illustration 6, reference 4040Original colors & callouts · Select to enlarge

NOTE: The following step will load test the circuit. A headlamp bulb would be an effective load. To avoid connector terminal damage, use the Flex Probe Kit for connector connections.

Source reference 4040

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.