Pinpoint Tests DC: Mass Airflow (MAF) Sensor: 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 |