Pinpoint Tests AE: Unable to Activate Self Test/Network Communication Error: 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:

unable to communicate with the PCM
unable to activate the PCM self-test
harness circuits VPWR, ISP-R, PCMRC and PWRGND

Fig 1: Manifold Absolute Pressure (MAP) Sensor Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
VREF (Reference Voltage)	3
SIGRTN (Signal Return)	1

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

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
ISP-R (Ignition Switch Position Run)	42
PCMRC (PCM Relay Control)	38
VPWR (Vehicle Power)	69
VPWR (Vehicle Power)	68
VPWR (Vehicle Power)	67
PWRGND (Power Ground)	70
PWRGND (Power Ground)	71
PWRGND (Power Ground)	72
PWRGND (Power Ground)	73
PWRGND (Power Ground)	74