Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Ford F-150 Police ResponderFACTORY OEM SERVICE PROCEDURE
Pinpoint Tests F: Intake Air Temperature (IAT) Sensor: Introduction
NOTE:
Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.
This pinpoint test is intended to diagnose the following:
- harness circuits: IAT and SIGRTN
- mass airflow/intake air temperature (MAF/IAT) sensor (12B579)
- PCM (12A650)
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| F-650/F-750, F-150, F-Series Super Duty |
A | 3 | SIGRTN |
| Transit Connect | B | 4 2 |
SIGRTN IAT |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Transit Connect | A | 4 17 |
SIGRTN IAT |
| All other vehicles | B | 11 | SIGRTN |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.