Pinpoint Tests J: Mass Airflow (MAF) Sensor: Introduction

NOTE: Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.

This pinpoint test is intended to diagnose the following:

mass air flow/intake air temperature (MAF/IAT) sensor (12B579)
harness circuits: MAF, SIGNAL, SIGRTN, and VPWR
PCM (12A650)

Fig 1: Mass Airflow/Intake Air Temperature (MAF/IAT) Sensor Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
F-650/F-750, F-150, F-Series Super Duty	A	1 3 2	SIGNAL SIGRTN VREF
Transit Connect	B	5 3 4	MAF VPWR SIGRTN

Fig 2: Powertrain Control Module-B (PCM-B) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Transit Connect	A	30 4	MAF SIGRTN
All other vehicles	B	11 10	SIGRTN SIGNAL