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 the resistance within specification?
Yes | No |
|---|---|
GO to DX4 . | 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. |
DX4 CHECK FOR AN OPEN CIRCUIT
• Ignition OFF.
• PCM connector disconnected.
• Measure the resistance between:
( + ) ECT Sensor Connector, Harness Side | ( - ) PCM Connector, Harness Side |
|---|---|
ECT - Pin 1 | ECT |
SIGRTN - Pin 2 | SIGRTN |
Are the resistances less than 5 ohms?
Yes | No |
|---|---|
GO to DX5 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
DX5 CHECK FOR A SHORT CIRCUIT
• Measure the resistance between:
( + ) ECT Sensor Connector, Harness Side | ( - ) |
|---|---|
ECT - Pin 1 | Ground |
• Measure the resistance between:
( + ) ECT Sensor Connector, Harness Side | ( - ) ECT Sensor Connector, Harness Side |
|---|---|
ECT - Pin 1 | SIGRTN - Pin 2 |
Are the resistances greater than 10K ohms?
Yes | No |
|---|---|
GO to DX6 . | REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. |
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.