PINPOINT TEST DC: Mass Air Flow (MAF) Sensor: Introduction
This pinpoint test is intended to diagnose the following:
- mass air flow (MAF) sensor (12B579)
- harness circuits: MAF SIG, MAF RTN, vehicle power (VPWR), power ground (PWRGND), IAT and SIGRTN
- powertrain control module (PCM) (12A650)
| Pin | Circuit |
|---|---|
| 1 | IAT (Intake Air Temperature) |
| 2 | SIGRTN (Signal Return) |
| 4 | MAF RTN (Mass Air Flow Return) |
| 3 | MAF (Mass Air Flow) |
| 5 | PWRGND (Power Ground) |
| 6 | VPWR (Vehicle Power) |
For PCM connector views or reference values, refer to the REFERENCE VALUES article.
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Edge, MKX, Sable, Taurus, Taurus X |
190 Pin | B41 B42 |
MAF MAF RTN |
| Escape/Mariner | 150 (50-50-50) Pin | B32 B43 |
MAF MAF RTN |
| Expedition, Fusion, Milan, MKZ, Navigator |
140 Pin | B41 B42 |
MAF MAF RTN |
| F-150, Mark LT |
190 Pin | E25 E26 |
MAF MAF RTN |
| Focus | 190 Pin | B40 B41 |
MAF MAF RTN |
| All other vehicles | 170 Pin | E25 E26 |
MAF MAF RTN |