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.
DX: Engine Coolant Temperature (ECT)
DX: Introduction
Sensor
DX1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
Are DTCs P0116, P0117, P0118, P0119, P011E, P0125, P0128, P1117, or P111B present?
Yes | No |
|---|---|
For DTC P111B, GO to DX10 . For all others, GO to DX2 . | For symptoms without DTCs, GO to DX2 . For all others, RETURN to Section 3 , Symptom Charts for further direction. |
DX2 CHECK THE COOLING SYSTEM
WARNING: TO AVOID PERSONAL INJURY DO NOT UNSCREW THE COOLANT PRESSURE RELIEF CAP WHILE THE ENGINE IS OPERATING OR HOT. THE COOLING SYSTEM IS UNDER PRESSURE. STEAM AND HOT LIQUID CAN COME OUT FORCEFULLY WHEN THE CAP IS LOOSENED SLIGHTLY. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
Note: Verify cooling fan operation before proceeding with this test.
• Check the cooling system for any loss of coolant or overheating concerns.
Is the cooling system OK?
Yes | No |
|---|---|
GO to DX3 . | REFER to the Workshop Manual Section 303- 03, Engine Cooling for cooling system diagnosis. Clear the PCM DTCs. REPEAT the self-test. |
DX3 CHECK THE RESISTANCE OF THE ECT SENSOR WITH THE ENGINE OFF
Note: Refer to the chart at the beginning of this test for the resistance specifications.
• Ignition OFF.
• ECT Sensor connector disconnected.
• Measure the resistance between:
( + ) ECT Sensor Connector, Component Side | ( - ) ECT Sensor Connector, Component Side |
|---|---|
ECT - Pin 1 | SIGRTN - Pin 2 |
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.