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.
QA5 CHECK THE PCM VPWR CIRCUITS FOR VOLTAGE
• Disconnect the PCM.
• Connect a 5 amp fused jumper wire between the following:
Point A PCM Connector, Harness Side | Point B |
|---|---|
PCMRC | Ground |
• Ignition ON, engine OFF.
• Measure the voltage between:
( + ) PCM Connector, Harness Side | ( - ) |
|---|---|
VPWR | Ground |
Is the voltage greater than 10.5 V?
Yes | No |
|---|---|
GO to QA6 . | GO to Pinpoint Test B . |
QA6 CHECK THE PCM GROUND CIRCUITS FOR AN OPEN
• Ignition OFF.
• Measure the resistance between:
( + ) PCM Connector, Harness Side | ( - ) |
|---|---|
PWRGND | Ground |
Is the resistance less than 5 ohms?
Yes | No |
|---|---|
GO to QA17 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
QA7 CHECK FOR A TRANSMISSION CONTROL MODULE (TCM) CONCERN
• Check for any TCM DTCs.
• Check for other TCM related symptoms.
Is a concern present?
Yes | No |
|---|---|
REFER to the Workshop Manual Section 307- 01, Automatic Transmission, DTC Charts to continue diagnosis. | For DTCs U1011 or U1013, GO to QA15 . For all others, GO to QA17 . |
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.