Pinpoint Test Dc: Mass Air Flow (MAF) Sensor: Introduction
WARNING: This page is about a different car, the 2014 Lincoln MKZ, 2014 Ford Fusion, and 2014 Ford C-Max. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
This pinpoint test is intended to diagnose the following:
- MAF sensor (12B579)
- harness circuits: MAF, VPWR, IAT and SIGRTN
- powertrain control module (PCM) (12A650)
| Pin | Circuit |
|---|---|
| 4 | SIGRTN (Signal Return) |
| 5 | MAF (Mass Airflow) |
| 3 | VPWR (Vehicle Power) |
| Pin | Circuit |
|---|---|
| E1 | SIGRTN (Signal Return) |
| E13 | MAF (Mass Airflow) |