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.
A7 CHECK FOR SPARK AT THE CYLINDERS
• Remove the fuel pump fuse to disable the fuel pump.
• Disconnect the ignition coils from the spark plugs on half of the number of cylinders on the engine.
• Connect the Adjustable Ignition Spark Tester THX458 or equivalent to a spark plug boot and repeat for half the number of cylinders on the engine.
• Observe the spark tester while cranking the engine.
Is a bluish-white spark present for each tested cylinder?
Yes | No |
|---|---|
GO to A8 . | For EcoSport 1.6L, Fiesta 1.6L TiVCT, and KA 1.5L, GO to Pinpoint Test JE . For all others, GO to Pinpoint Test JF . |
A8 CHECK THE FUEL PRESSURE
WARNING: THE FUEL SYSTEM REMAINS PRESSURIZED WHEN THE ENGINE IS NOT RUNNING. TO PREVENT INJURY OR FIRE, USE CAUTION WHEN WORKING ON THE FUEL SYSTEM.
REFER TO THE FUEL SYSTEM WARNING INFORMATION AT THE BEGINNING OF PINPOINT TEST HC.
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
Note: While activating the fuel pump on an electronic returnless fuel system a brief pressure spike may occur.
• Ignition OFF.
• Relieve the fuel pressure. Refer to the Workshop Manual Section 310-00, Fuel System for the Fuel System Pressure Release procedure.
• Connect the fuel pressure gauge using the appropriate fuel pressure test hose and adaptor.
• Ignition ON, engine OFF.
• Access the PCM and control the FP (MODE) PID.
• Activate the fuel pump to obtain maximum fuel pressure.
Is the fuel pressure within specification (refer to the fuel pressure chart in Pinpoint Test HC)?
Yes | No |
|---|---|
GO to A9 . | GO to Pinpoint Test HC . |
A9 CHECK THE FUEL PRESSURE LEAKDOWN
• Ignition ON, engine OFF.
• Access the PCM and control the FP (MODE) PID.
• Activate the fuel pump to obtain maximum fuel pressure.
• Monitor the FRP.
• Verify the fuel pressure remains within 34 kPa (5 psi) of the maximum pressure for 1 minute after turning the pump off.
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.