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.
HP: High Pressure Fuel Delivery System
HP: Introduction
HP1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
Note: Diagnose and repair all circuit DTCs before diagnosing P0087 or P0088.
Are DTCs P0001, P0003, P0004, P0087, P0088, P00C6 or P053F present?
Yes | No |
|---|---|
For DTC P0087, GO to HP2 . For DTC P0088, GO to HP10 . For DTCs P00C6 or P053F, GO to HP4 . For all others, GO to HP5 . | RETURN to Section 3 , Symptom Charts for further direction. |
HP2 CHECK THE LOW PRESSURE FUEL SYSTEM PRESSURE WITH ENGINE RUNNING
• Ignition OFF.
• Relieve the fuel pressure. Refer to the Workshop Manual Section 310-00, Fuel System for the Fuel System Pressure Release procedure.
• Mechanical fuel pressure gauge connected.
• Ignition ON, engine OFF.
• Pressurize the fuel system. Refer to the Workshop Manual Section 310-00, Fuel System for the Fuel System Pressure Release procedure to pressurize the fuel system.
• Ignition ON, engine running.
• Monitor the mechanical fuel pressure gauge.
Is the low pressure fuel system pressure greater than 310 kPa (45 psi)?
Yes | No |
|---|---|
GO to HP3 . | GO to Pinpoint Test HC . |
HP3 COMPARE THE FLP PID TO THE MECHANICAL GAUGE
Note: The vehicle may exhibit a long crank until the fuel system is pressurized.
• Ignition OFF.
• Relieve the fuel pressure. Refer to the Workshop Manual Section 310-00, Fuel System for the Fuel System Pressure Release procedure.
• Disable the fuel pump.
• Ignition ON, engine OFF.
• Monitor the mechanical gauge.
• Access the PCM and monitor the FLP (PRESS) PID.
• Compare the FLP PID to the mechanical gauge.
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.