Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2018EXPEDITION LIMITED, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 325 (ENGINE CONTROLS - PINPOINT TEST A: NO START THROUGH PINPOINT TEST DL: CYLINDER HEAD TEMPERATURE (CHT) SENSOR - (EXCEPT DIESEL & HYBRID))PINPOINT TEST DC: MASS AIRFLOW (MAF) SENSORINTRODUCTION
2018 Ford Expedition Limited, RWD
Pinpoint Test Dc: Mass Airflow (MAF) Sensor: Introduction
2018 Ford Expedition Limited, RWDSECTION Introduction
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2016 Lincoln Navigator, 2016 Lincoln MKZ, 2016 Lincoln MKX, 2016 Lincoln MKT, and 2016 Lincoln MKS. 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 |
|---|---|---|---|
| E-Series 5.4L, MKX |
A | 4 3 5 6 |
MAFRTN MAF GND VPWR |
| Motorhome/Stripped Chassis/Step Van | A | 5 4 3 |
MAF GND VPWR |
| All other vehicles | A | 4 5 3 |
SIGRTN MAF VPWR |
Powertrain Control Module (PCM) Connector
For PCM connector views or reference values, refer to REFERENCE VALUES .
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| E-Series 5.4L | 190-PIN | B41 B40 |
MAFRTN MAF |
| Escape/Kuga, Fusion, MKZ |
190-PIN | B41 B40 |
SIGRTN MAF |
| F-150 | 198 PIN | B2 | SIGRTN |
| F-Series Super Duty | 190-PIN | B2 B40 |
SIGRTN MAF |
| Fiesta | 198 PIN | B9 B8 |
SIGRTN MAF |
| Focus | 154 PIN | E36 E55 |
SIGRTN MAF |
| MKX | 198 PIN | B40 | MAF |
| All other vehicles | 198 PIN | B54 B73 |
SIGRTN MAF |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.