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

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

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 HYBRID 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)
unable to communicate with the transaxle control module (TCM)
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.

ETB CONNECTOR PINS REFERENCE CHART

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

Fig 2: Transaxle Assembly-A Connector

Courtesy of FORD MOTOR CO.

TRANSAXLE ASSEMBLY-A CONNECTOR PINS REFERENCE CHART

Pin	Circuit
4, 5	VPWR (Vehicle Power)
2, 8	GND (Ground)
12	B+ (Battery Positive Voltage)

Fig 3: Powertrain Control Module (PCM) Connector

Courtesy of FORD MOTOR CO.

PCM CONNECTOR PINS REFERENCE CHART

Pin	Circuit
B69, B70	PWRGND (Power Ground)
B67, B68	VPWR (Vehicle Power)
B38	PCMRC (PCM Relay Control)
B42	ISP-R (Ignition Switch Position Run)