Charging System - 5.0L 32V Ti-VCT — 2016 workshop reference 4038

No	GO to B2

B2 RETRIEVE DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, perform the PCM self-test.

Is DTC P0620, P0625 or P0626 present?

Yes	For DTC P0620, GO to Pinpoint Test F For Diagnostic Trouble Codes (DTCs) P0625 and P0626, GO to Pinpoint Test G
No	GO to B3

B3 CHECK THE GENERATOR CONNECTIONS

Ignition OFF. Disconnect all of the generator connectors and inspect for:

corrosion (install new connector or terminals – clean module pins) damaged or bent pins – install new terminals/pins pushed-out pins – install new pins as necessary

Reconnect the generator connectors. Make sure they seat and latch correctly. Measure and record:

Positive Lead	Measurement / Action	Negative Lead
Charging System - 5.0L 32V Ti-VCT — original illustration 1, reference 4038Original colors & callouts · Select to enlarge		Charging System - 5.0L 32V Ti-VCT — original illustration 2, reference 4038Original colors & callouts · Select to enlarge

Positive Lead

Measurement /

Action

Negative Lead

Charging System - 5.0L 32V Ti-VCT — original illustration 1, reference 4038Original colors & callouts · Select to enlarge

Charging System - 5.0L 32V Ti-VCT — original illustration 2, reference 4038Original colors & callouts · Select to enlarge

Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C102C-1		Ground

Is the voltage within 0.5 volt of the recorded battery voltage?

Yes	GO to B4
No	TIGHTEN or INSTALL a new generator B+ nut as needed. REFER to: Generator - 5.0L 32V Ti-VCT (414-02 Generator and Regulator, Removal and Installation). VERIFY high current BJB MEGA fuse (275A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

B4 CHECK THE VOLTAGE DROP IN THE GENERATOR B+ CIRCUIT

Start the engine. With the engine running at idle, headlamps on and blower on high, measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C102C-1

Perform a wiggle test of the generator wiring and connections while measuring voltage drop.

Is the voltage drop less than 0.5 volt?

Yes	GO to B5
No	INSPECT and REPAIR any corrosion in the generator B+ circuit or positive battery cable connections.

Source reference 4038

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.