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.
JC: Secondary Ignition (Coil Pack)
JC: Introduction
JC1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
Are DTCs P0300, P0301, P0302, P0303 or P0304?
Yes | No |
|---|---|
For DTC P0300, GO to JC2 . For all others, GO to JC10 . | For symptoms without DTCs, GO to JC2 . For all others, RETURN to Section 3 , Symptom Charts for further direction. |
JC2 CYLINDER POWER BALANCE TEST
Note: The IDS test referenced in this step may not be available on all vehicles. Follow the YES answer if the IDS test is not available.
• Carry out the Power Balance Test. Refer to the instruction manual provided by the scan tool manufacturer.
Are all cylinders contributing correctly during the power balance test?
Yes | No |
|---|---|
GO to JC3 . | For a coil pack using an engine analyzer, GO to JC4 . For a coil pack not using an engine analyzer, GO to JC10 . |
JC3 VISUAL INSPECTION OF THE IGNITION SYSTEM
• Visually inspect the engine compartment to make sure all coils and spark plug wires are correctly and securely connected.
• Examine all wiring harnesses and connectors for damaged, burned or overheated insulation and loose or broken conditions.
• Visually inspect the interior and exterior surfaces of the coil tower for damage or carbon tracking.
• Visually inspect the interior and exterior surfaces of the spark plug wire boots for damage or carbon tracking.
• Make sure the vehicle battery is in good condition and all accessories are turned off.
Is a concern present?
Yes | No |
|---|---|
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test. | For a coil pack using an engine analyzer, GO to JC4 . |
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.