Pinpoint Test JH: Engine Speed Signal: 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 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:

harness circuits: clean tach output (CTO)
powertrain control module (PCM) (12A650)
transaxle assembly (7000)

Fig 1: Transaxle Assembly-B Connector

Courtesy of FORD MOTOR CO.

TRANSAXLE ASSEMBLY-B CONNECTOR PINS REFERENCE CHART

Pin	Circuit
4	TMAC (Torque of Motor - AC signal)
9	TGAC (Torque of Generator - AC signal)
5	GMSDN (Generator Motor Shutdown)
7	ISDN2 (Immediate Shutdown 2)
1	CTO (Clean Tachometer Output)

Fig 2: Powertrain Control Module (PCM) Connector

Courtesy of FORD MOTOR CO.

PCM CONNECTOR PINS REFERENCE CHART

Pin	Circuit
B10	CTO (Clean Tach Out)