Pinpoint Test Dc: Mass Air Flow (MAF) Sensor: Introduction
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Mercury Grand Marquis, and 2009 Lincoln Town Car. 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 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)
For PCM connector views or reference values, refer to REFERENCE VALUES .
POWERTRAIN CONTROL MODULE (PCM) CONNECTOR
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| E-Series 4.6L, E-Series 5.4L, Escape/Mariner, Expedition, F-150, Focus, Navigator |
190-Pin | B40 B41 |
MAF MAF RTN |
| Edge, Flex, MKS, MKX, Sable, Taurus, Taurus X |
190-Pin | B41 B42 |
MAF MAF RTN |
| Fusion, Milan, MKZ |
140 Pin | B41 B42 |
MAF MAF RTN |
| All other vehicles | 170 Pin | E25 E26 |
MAF MAF RTN |