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.
DX9 CHECK THE ECT CIRCUIT VOLTAGE CYCLING INTEGRITY
Note: All PIDs may not be available on all vehicles.
• Ignition OFF.
• ECT Sensor connector disconnected.
• Ignition ON, engine OFF.
• Access the PCM and monitor the ECT (TEMP) and ECT1 (TEMP) PIDs.
• Record the PID value.
• Connect a 5 amp fused jumper wire between the following:
Point A ECT Sensor Connector, Harness Side | Point B ECT Sensor Connector, Harness Side |
|---|---|
ECT - Pin 1 | SIGRTN |
• Record the PID value.
Does the PID value change when the jumper is connected?
Yes | No |
|---|---|
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 DX12 . |
DX10 CHECK FOR OTHER DTCS
• Carry out the PCM self-test.
Are any other DTCs present?
Yes | No |
|---|---|
DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to Section 4, Diagnostic Trouble Code (DTC) Charts and Descriptions. | GO to DX11 . |
DX11 CHECK FOR COOLING SYSTEM CONCERNS
• Verify the engine cooling system is operating correctly. Refer to the Workshop Manual Section 303-03, Engine Cooling.
• Check for:
◾ the engine overheats ◾ the engine does not reach normal operating temperature
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.