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HOMESERVICE MANUALSFORD2021F-150 LIMITED, 3.5L ENG VIN 8, RWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTMEMORY MODULESENGINE CONTROLS - PINPOINT TESTS (EXCEPT DIESEL & HYBRID) (A TO H)PINPOINT TESTS DA: INTAKE AIR TEMPERATURE (IAT) SENSORINTRODUCTION
2021 Ford F-150 Limited, 3.5L Eng VIN 8, RWD
Pinpoint Tests DA: Intake Air Temperature (IAT) Sensor: Introduction
2021 Ford F-150 Limited, 3.5L Eng VIN 8, RWDSECTION Introduction
This pinpoint test is intended to diagnose the following:
- IAT sensor (12A697)
- integrated mass airflow/intake air temperature (MAF/IAT) sensor (12B579)
- manifold absolute pressure and temperature (MAPT) sensor (9F479)
- harness circuits: IAT and SIGRTN
- PCM (12A650)
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| E-Series, F-650/F-750, F-Series Super Duty, Motorhome/Stripped Chassis/Step Van | A | 3 4 |
SIGRTN IAT |
| EcoSport 2.0L, Ford GT, Mustang 5.0L, Mustang TiVCT 5.2L, Transit Connect 2.0L, Transit Connect 2.5L | B | 4 2 |
SIGRTN IAT |
| KA | C | 1 2 |
SIGRTN IAT |
| All other vehicles | D | 2 1 |
SIGRTN IAT |
Fig 2: Mass Air Flow Bank 2, Sensor 1/Intake Air Temperature Bank 2, Sensor 1 (MAF21/IAT21) Sensor Connector
| Pin | Circuit |
|---|---|
| 4 | SIGRTN (Signal Return) |
| 2 | IAT21 (Intake Air Temperature Bank 2, Sensor 1) |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Continental, EcoSport 1.5L, Edge, Explorer 3.3L, KA, Nautilus, Transit Connect 1.0L | A | 4 3 |
SIGRTN IAT |
| Corsair 2.5L, Escape/Kuga 2.5L, F-150 3.3L, F-150 5.0L, F-Series Super Duty 6.2L | B | 4 3 |
SIGRTN IAT |
| Ranger 2.5L | C | 4 3 |
SIGRTN IAT |
| Transit TiVCT 3.5L | A | 4 1 |
SIGRTN IAT |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to Reference Values.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Aviator, Explorer 3.0L, Mustang 5.2L Supercharged | 306 PIN | B28 B24 |
SIGRTN IAT |
| Continental, EcoSport 1.0L Manual Transmission | 198 PIN | B19 B75 |
SIGRTN IAT |
| Corsair 2.5L, Escape/Kuga 2.5L | 198 PIN | E77 E24 |
SIGRTN IAT |
| E-Series, Edge 2.7L, F-650/F-750, F-Series Super Duty 7.3L, Motorhome/Stripped Chassis/Step Van, Mustang 5.0L, Nautilus 2.7L | 306 PIN | B58 B24 |
SIGRTN IAT |
| EcoSport 1.0L Automatic Transmission | 198 PIN | B19 B77 |
SIGRTN IAT |
| EcoSport 1.5L Automatic Transmission, KA 1.5L Automatic Transmission | 198 PIN | E35 E24 |
SIGRTN IAT |
| EcoSport 1.5L Manual Transmission, KA 1.2L, KA 1.5L Manual Transmission | 112 PIN | E4 E20 |
SIGRTN IAT |
| EcoSport 2.0L | 198 PIN | B9 B75 |
SIGRTN IAT |
| Expedition High Output, Navigator High Output | 198 PIN | E20 B34 |
SIGRTN IAT |
| Expedition Base, Navigator Base, Transit GTDI 3.5L | 306 PIN | B26 B24 |
SIGRTN IAT |
| Explorer 3.3L, F-Series Super Duty 6.2L | 306 PIN | E13 E52 |
SIGRTN IAT |
| F-150 2.7L, F-150 3.5L | 306 PIN | B40 B35 |
SIGRTN IAT |
| F-150 3.3L, F-150 5.0L | 306 PIN | E89 E72 |
SIGRTN IAT |
| Ford GT | 198 PIN | B9 B75 E32 B76 |
SIGRTN IAT SIGRTN IAT21 |
| KA 1.0L | 128 PIN | T17 T10 |
SIGRTN IAT |
| Mustang TiVCT 5.2L | 198 PIN | B54 E27 |
SIGRTN IAT |
| Ranger 2.5L | 128 PIN | B38 E17 |
SIGRTN IAT |
| Transit TiVCT 3.5L | 306 PIN | E13 E50 |
SIGRTN IAT |
| Transit Connect 2.0L | 198 PIN | B89 B56 |
SIGRTN IAT |
| Transit Connect 2.5L | 198 PIN | B54 B25 |
SIGRTN IAT |
| All other vehicles | 198 PIN | B36 B56 |
SIGRTN IAT |
RENDER: 1.0x
NO RELATED
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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.