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.
( + ) IAT Sensor Connector, Harness Side ( - ) PCM Connector, Harness Side
SIGRTN | SIGRTN |
Are the resistances less than 5 ohms?
Yes | No |
|---|---|
GO to DA3 . | REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test. |
DA3 CHECK FOR A SHORT TO GROUND
• For EcoSport, F-150 3.5L TIVCT, F-150 5.0L, Fiesta 1.6L TIVCT, Flex 3.5L TIVCT, KA, MKS
3.7L, MKT 3.7L, Mustang 3.7L, Taurus 3.5L TIVCT, Taurus 3.7L and Transit 3.7L,
• Measure the resistance between:
( + ) MAPT Sensor Connector, Harness Side | ( - ) |
|---|---|
IAT | Ground |
• For all others,
• Measure the resistance between:
( + ) IAT Sensor Connector, Harness Side | ( - ) |
|---|---|
IAT | Ground |
Is the resistance greater than 10K ohms?
Yes | No |
|---|---|
GO to DA4 . | REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test. |
DA4 CHECK FOR A SHORT TO VOLTAGE
• Ignition ON, engine OFF.
• For EcoSport, F-150 3.5L TIVCT, F-150 5.0L, Fiesta 1.6L TIVCT, Flex 3.5L TIVCT, KA, MKS
3.7L, MKT 3.7L, Mustang 3.7L, Taurus 3.5L TIVCT, Taurus 3.7L and Transit 3.7L,
• Measure the voltage between:
( + ) MAPT Sensor Connector, Harness Side | ( - ) |
|---|---|
IAT | Ground |
• For all others,
• Measure the voltage between:
( + ) IAT Sensor Connector, Harness Side | ( - ) |
|---|---|
IAT | Ground |
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.