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.

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

Fig 2: Manifold Absolute Pressure And Charge Air Cooler Temperature (MAP/CACT) Sensor Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
4	SIGRTN (Signal Return)
2	VREF (Reference Voltage)

Fig 3: Powertrain Control Module-B (PCM-B) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
F-150	A	47, 61, 62, 76, 77 67, 68, 69 50 21	PWRGND VPWR PCMRC ISP-R
Transit Connect	B	96, 97, 98 101, 102, 103 42 82	PWRGND VPWR PCMRC ISP-R
All other vehicles	A	47, 61, 62, 76, 77 1, 16, 17, 2 50 21	PWRGND VPWR PCMRC ISP-R