Pinpoint Tests QA: Unable To Activate Self-Test/Network Communication Error: Introduction

WARNING: TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.

This pinpoint test is intended to diagnose the following:

unable to communicate with the powertrain control module (PCM)
incorrect self-test procedure
harness circuits: B+, ETCREF, GND, ISP-R, PWRGND and VPWR

Fig 1: Electronic Throttle Body (ETB) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
4	ETCRTN (Electronic Throttle Control Return)
5	ETCREF (Electronic Throttle Control Reference Voltage)

Fig 2: Powertrain Control Module (PCM) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
B35, B36, B47, B48, T31	PWRGND (Power Ground)
B11, B12	VPWR (Vehicle Power)
B1	PCMRC (PCM Relay Control)
B8	ISP-R (Ignition Switch Position Run)