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.
REPAIR the short circuit. CARRY out the misfire monitor drive cycle. REFER to Section 2, On Board Diagnostic (OBD) Drive Cycle. Clear the PCM DTCs. REPEAT the self-test. | GO to JE7 . |
JE7 CHECK THE SUSPECT CD CIRCUIT FOR A SHORT TO GROUND
• Ignition OFF.
• Measure the resistance between:
( + ) Coil Pack Assembly Connector, Harness Side | ( - ) |
|---|---|
Suspect coil driver | Ground |
Is the resistance greater than 10K ohms?
Yes | No |
|---|---|
GO to JE9 . | REPAIR the short circuit. CARRY out the misfire monitor drive cycle. REFER to Section 2, On Board Diagnostic (OBD) Drive Cycle. Clear the PCM DTCs. REPEAT the self-test. |
JE8 CHECK THE SUSPECT COIL FOR DAMAGE
• Ignition OFF.
• Remove the spark plug wire from the suspect coil tower (as determined from the table).
• Connect the Adjustable Ignition Spark Tester THX458 or equivalent to the suspect spark plug wire.
• Observe the spark tester while cranking the engine.
Is a bluish-white spark present?
Yes | No |
|---|---|
GO to Pinpoint Test Z . | INSTALL a new coil pack as needed. REFER to the Workshop Manual Section 303-07, Engine Ignition. CARRY out the misfire monitor drive cycle. REFER to Section 2, On Board Diagnostic (OBD) Drive Cycle. Clear the PCM DTCs. REPEAT the self-test. |
JE9 CHECK FOR CORRECT PCM OPERATION
• Disconnect all the PCM connectors.
• Visually inspect for:
◾ pushed out pins ◾ corrosion
• Connect all the PCM connectors and make sure they seat correctly.
• Carry out the PCM self-test.
• Verify the concern is still present.
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.