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.
DX6 CHECK FOR A SHORT TO VOLTAGE
• Measure the voltage between:
( + ) ECT Sensor Connector, Harness Side | ( - ) |
|---|---|
ECT - Pin 1 | Ground |
Is any voltage present?
Yes | No |
|---|---|
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. | GO to DX7 . |
DX7 INTERMITTENT CHECK
Note: All PIDs may not be available on all vehicles.
• Ignition OFF.
• PCM connector connected.
• ECT Sensor connector connected.
• Ignition ON, engine OFF.
• Access the PCM and monitor the ECT (TEMP) and ECT1 (TEMP) PIDs.
• While observing the PID, wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM.
• Lightly tap on the ECT sensor and wiggle the harness and connector to simulate road shock.
Does the PID reading change?
Yes | No |
|---|---|
REPAIR as necessary or INSTALL a new ECT 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. | GO to DX8 . |
DX8 CHECK ENGINE COOLANT TEMPERATURE AND AMBIENT AIR TEMPERATURE CORRELATION
Note: Check temperature values while engine is at ambient temperature, cold soak the engine for a minimum of 6 hours if necessary. Make sure the vehicle has not been in direct sunlight.
Note: All PIDs may not be available on all vehicles.
• Access the PCM and monitor the AAT (TEMP), ECT (TEMP) and ECT1 (TEMP) PIDs.
Are the temperature readings within 18°C (32.2°F) of each other?
Yes | No |
|---|---|
GO to DX9 . | INSTALL a new ECT sensor. REFER to the Workshop Manual Section 303- |
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.