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: Identifying Manifold Absolute Pressure (MAP) Sensor Connector

Courtesy of FORD MOTOR CO.

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

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

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Transit	A	2, 3, 42, 53, 7 17, 29, 5 48 39	PWRGND VPWR PCMRC ISP-R
All other vehicles	B	70, 71, 72, 73, 74 67, 68, 69 38 42	PWRGND VPWR PCMRC ISP-R