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.
Is any voltage present?
Yes | No |
|---|---|
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. | GO to DC21 . |
DC21 CHECK FOR AN INTERMITTENT CONCERN
• Ignition OFF.
• PCM connector connected.
• MAF/IAT Sensor connector connected.
• Ignition ON, engine running.
• Run the engine up to 1,500 RPM for 5 seconds, then bring it back to idle. Run the engine up to 1,500 RPM for 5 seconds, then bring it back to idle.
• If the idle is not stable, refer to Section 3, No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index.
• Access the PCM and monitor the MAF_HZ (FREQ) PID.
• Lightly tap on the MAF sensor and wiggle the harness connector to simulate road shock.
Does the MAF PID reading change?
Yes | No |
|---|---|
CLEAN the MAF/IAT sensor using CRC Mass Air Flow Sensor Cleaner 05110 or equivalent. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM). REPEAT the self-test. If the concern is still present, INSTALL a new MAF/IAT sensor. REFER to the Workshop Manual Section 303-14, Electronic Engine Controls. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM). REPEAT the self-test. If the concern or DTC is still present, GO to DC23 . | GO to DC22 . |
DC22 CHECK THE MAF/IAT HARNESS FOR INTERMITTENT CONCERNS
• Access the PCM and monitor the MAF_HZ (FREQ) PID.
• While observing the PID, wiggle, shake, and bend small sections of the wiring harness working from the sensor to the PCM.
Does the MAF PID reading change?
Yes | No |
|---|---|
CLEAN the MAF/IAT sensor using CRC Mass Air Flow Sensor Cleaner 05110 or equivalent. |
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.