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.

Vehicle	Connector	Pin	Circuit
F-150	A	2 3	SIGRTN VREF
All other vehicles	B	1 3	SIGRTN VREF

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

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
F-150	A	73, 72, 71, 70 69, 68, 67 38 42	PWRGND VPWR PCMRC ISP-R
Transit	B	2, 3, 42, 53, 7 17, 29, 5 48 39	PWRGND VPWR PCMRC ISP-R
All other vehicles	A	70, 71, 72, 73, 74 67, 68, 69 38 42	PWRGND VPWR PCMRC ISP-R