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

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

This pinpoint test is intended to diagnose the following:

unable to communicate with PCM
unable to activate the PCM self-test.
incorrect self-test procedure
harness circuits: ISP-R, PCMRC, PWRGND and VPWR

VREF INFORMATION TABLE

Application	Engine	Measure the PCM VREF at:
Edge/MKX	All	ETBTPS
Escape/Mariner	All	TP Sensor or FRPT
Expedition/Navigator	All	ETBTPS
Focus	All	ETBTPS
Fusion/Milan/MKZ	All	ETBTPS
Ranger	All	TP Sensor
Taurus/Taurus X/Sable	All	ETBTPS
All Others	All	FRPT

Fig 1: Electronic Throttle Body Throttle Position Sensor (ETBTPS) Connector - A

Courtesy of FORD MOTOR CO.

Fig 2: Electronic Throttle Body Throttle Position Sensor (ETBTPS) Connector - B

Courtesy of FORD MOTOR CO.

Fig 3: Electronic Throttle Body Throttle Position Sensor (ETBTPS) Connector - C

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
E-Series 4.6L, Edge, F-150 4.2L, F-150 4.6L, Focus, MKX, MKZ, Sable, Taurus, Taurus X	A	2 3	ETCRTN ETCREF
Fusion 2.3L, Milan 2.3L	B	3 5	ETCRTN ETCREF
Fusion 3.0L, Milan 3.0L	B	4 5	ETCRTN ETCREF
All other vehicles	C	3 2	ETCRTN ETCREF

Fig 4: Fuel Rail Pressure Temperature (FRPT) Sensor Connector

Courtesy of FORD MOTOR CO.

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

Fig 5: Throttle Position (TP) Sensor Connector - A

Courtesy of FORD MOTOR CO.

Fig 6: Throttle Position (TP) Sensor Connector - B

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Escape/Mariner 2.3L, Ranger 2.3L	A	1 3	SIGRTN VREF
All other vehicles	B	3 1	SIGRTN VREF

Vehicle	Connector	Pin	Circuit
Edge, MKX, Sable, Taurus, Taurus X	190 Pin	B67, B68, B69, B70 B51, B52, B53 B8 B7	PWRGND VPWR PCMRC ISP-R
Escape/Mariner	150 (50-50-50) Pin	B47, B48, B49, B50 B35, B36	PWRGND VPWR
Expedition, Navigator	140 Pin	B67, B68, B69, B70 B51, B52, B53 B8 B7	PWRGND VPWR PCMRC ISP-R
Explorer, Explorer Sport Trac, Mountaineer, Mustang	170 Pin	B47, B48, B49, B50 B35, B36 B37 B46	PWRGND VPWR PCMRC ISP-R
F-150, Mark LT	190 Pin	B67, B68, B69, B70 B51, B52, B53 B40 B17	PWRGND VPWR PCMRC ISP-R
F-Super Duty	170 Pin	B47, B48, B49, B50 B35, B36 B37 B31	PWRGND VPWR PCMRC ISP-R
Focus	190 Pin	B69, B70 B67, B68 B38 B42	PWRGND VPWR PCMRC ISP-R
Fusion, Milan, MKZ	140 Pin	B67, B68, B69 B51, B52 B35 B37	PWRGND VPWR PCMRC ISP-R
All other vehicles	170 Pin	B47, B48, B49, B50 B35, B36	PWRGND VPWR