Pinpoint Tests Dc: Mass Airflow (MAF) Sensor: Introduction
WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2021 Lincoln Navigator, 2021 Lincoln Nautilus, 2021 Lincoln Corsair, 2021 Lincoln Aviator, and 2021 Ford Transit-350 HD. However, it is still accessible from the selected car via links, so may be relevant.
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 |