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.
HX35 CHECK THE INSTRUMENT PANEL CLUSTER (IPC) FOR DTCS
• Carry out the ICIPC self-test.
Are any DTCs present?
Yes | No |
|---|---|
GO to HX36 . |
HX36 CHECK THE FLI PID
• Ignition ON, engine running.
• Access the PCM and monitor the FLI (PER) PID.
Does the FLI PID match the fuel gauge?
Yes | No |
|---|---|
GO to HX37 . | GO to HX53 . |
HX37 CHECK FOR FUEL TANK FLOAT LEVEL RESPONSE
Note: A dual-container (saddle type) fuel tank has two fuel level sensors. The FLI PID in the PCM is the average value of both fuel level sensors. Some dual-container tanks may require the fuel level to be greater 3/4 full before the fuel level equalizes.
• Ignition ON, engine running.
• Access the PCM and monitor the FLI (PER) PID.
• Ignition OFF.
• If the fuel level is less than 1/4 (25% on FLI), add approximately 1/4 tank of fuel.
• If the fuel level is greater than 3/4 (75% on FLI), drain approximately 1/4 tank of fuel.
• Ignition ON, engine running.
Does the FLI PID indicate a movement upward or downward as fuel is either added or drained?
Yes | No |
|---|---|
Unable to duplicate or identify the concern at this time. GO to Pinpoint Test Z . |
HX38 CHECK THE FUEL FILLER CAP OR CAPLESS FUEL TANK FILLER PIPE
• For vehicles with a fuel filler cap, visually inspect the fuel filler cap without initially disturbing it.
◾ Verify the fuel filler cap tether is visible and free to move. ◾ Check for missing or loose fuel filler cap. ◾ Check the fuel filler cap for damage.
• For vehicles with a capless fuel tank filler pipe, visually inspect the capless fuel tank filler pipe inlet without initially disturbing it.
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.