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.
DL: Cylinder Head Temperature (CHT) Sensor
DL: Introduction
DL1 CHECK FOR DTCS
Are DTCs P0116, P0119, P0125, P0128, P017C, P017D, P017E, P101F, P1021, P1022, P1023, P1024, P1025, P1026, P1285, P1288, P1289, P128A, or P1290 present?
Yes | No |
|---|---|
GO to DL2 . | For temperature warning indicator lamp or gauge (applications with CHT sensor only) symptom, GO to DL12 . For all others, RETURN to Section 3 , Symptom Charts for further direction. |
DL2 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: DTC P0125 or P0128 indicates the engine coolant temperature has not achieved the required engine operation temperature level, since start-up within a specified amount of time.
• Check the cooling system for:
◾ correct coolant level ◾ internal or external coolant leaks ◾ blockage of the radiator ◾ cooling fan operation
Is the cooling system OK?
Yes | No |
|---|---|
For DTCs P0125 or P0128, GO to DL11 . For all others, GO to DL3 . | REFER to the Workshop Manual Section 303- 03, Engine Cooling to diagnose a cooling system concern. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. |
DL3 CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE OFF
Note: Refer to the chart at the beginning of this test for the resistance specifications.
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.