Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
B: Powertrain Control Module (PCM) Power
B: Introduction
Relay
B1 CHECK FOR DTCS
Note: If DTC P0607, P068A or P06B8 is retrieved after a PCM reprogramming, turn the ignition OFF and allow the PCM to complete a normal power down sequence. Clear the PCM DTCs and repeat the PCM self-test. If DTC P0607, P068A or P06B8 is retrieved again, continue with this pinpoint test.
Are DTCs P0685, P0686, P0687, P0689, P068A, P0690, P1793, P2510, or U300C present?
Yes | No |
|---|---|
For DTC P068A, GO to B2 . For DTCs P0689 and P2510, GO to B7 . For all others, GO to B9 . | GO to B4 . |
B2 CHECK THE BATTERY AND CHARGING SYSTEM
• Check the battery and charging system voltages. Refer to the Workshop Manual Section 414-00, Charging System, Inspection and Verification.
Are the battery and charging system voltages within specification?
Yes | No |
|---|---|
GO to B3 . | REPAIR as necessary. REFER to the Workshop Manual Section 414-00, Charging System, Symptom Chart to diagnose the system voltage low or battery is discharged symptom or the system voltage high symptom. Clear the PCM DTCs. REPEAT the self-test. |
B3 CHECK THE PCM POWER RELAY
• Carry out the PCM power relay component test. Refer to the Wiring Diagrams Cell 149, Component Testing.
Does the PCM power relay pass the component test?
Yes | No |
|---|---|
GO to B4 . | INSTALL a new PCM Power Relay. Clear the PCM DTCs. REPEAT the self-test. |
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.