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.
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HOMESERVICE MANUALSFORD2021TRANSIT-350 XLT, 3.5L ENG VIN G, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - PINPOINT TESTS (EXCEPT DIESEL & HYBRID) (A TO H)PINPOINT TESTS DC: MASS AIRFLOW (MAF) SENSORINTRODUCTION
2021 Ford Transit-350 XLT, 3.5L Eng VIN G, RWD
Pinpoint Tests Dc: Mass Airflow (MAF) Sensor: Introduction
2021 Ford Transit-350 XLT, 3.5L Eng VIN G, RWDSECTION Introduction
This pinpoint test is intended to diagnose the following:
- mass airflow (MAF) sensor (12B579)
- harness circuits: IAT, GND, MAF, MAFRTN, SIGRTN and VPWR
- PCM (12A650)
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| EcoSport, Mustang, Transit Connect | A | 4 5 3 |
SIGRTN MAF VPWR |
| All other vehicles | B | 3 1 |
SIGRTN MAF |
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) |
| 5 | MAF21 (Mass Air Flow Bank 2, Sensor 1) |
| 3 | VPWR (Vehicle Power) |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to Reference Values.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| EcoSport | 198 PIN | B9 B8 |
SIGRTN MAF |
| Ford GT | 198 PIN | B9 B8 E32 E27 |
SIGRTN MAF SIGRTN MAF21 |
| Mustang 5.0L | 306 PIN | B58 B36 |
SIGRTN MAF |
| Mustang 5.2L, Transit Connect 2.5L | 198 PIN | B54 B73 |
SIGRTN MAF |
| Transit Connect 2.0L | 198 PIN | B89 B90 |
SIGRTN MAF |
| All other vehicles | 306 PIN | B58 T39 |
SIGRTN MAF |
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.