Pinpoint Test 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, SIGRTN, and VPWR
PCM (12A650)

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

Courtesy of FORD MOTOR CO.

Pin	Circuit
4	SIGRTN (Signal Return)
5	MAF (Mass Airflow)
3	VPWR (Vehicle Power)

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

Courtesy of FORD MOTOR CO.

Pin	Circuit
60	SIGRTN (Signal Return)
40	MAF (Mass Airflow)