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Pinpoint Tests 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 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:

Fig 1: Transmission Control Module-A (TCM-A) Connector
G13533494Courtesy of FORD MOTOR CO.

Harness Side

Circuit Pin
CTO (Clean Tachometer Output) 4
Fig 2: Powertrain Control Module (PCM) Connector
G13533495Courtesy of FORD MOTOR CO.

Harness Side

Circuit Pin
CTO (Clean Tach Out) B10