Secondary Speed Timing Sensor Harness Inspection on Certain C18 Engines {1408} Caterpillar

Excavator

390F (S/N: MGF1-UP)

Landfill Compactor

836K (S/N: TWZ1-UP)

Off Highway Truck

772G (S/N: KEX1-UP)

Track-Type Tractor

D9T (S/N: TWG1-UP; RJS1-UP; REX1-UP)

Wheel Loader

988K (S/N: TWX1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

The secondary speed timing sensor has had vibration causing the connector to fatigue on the engine harness side.

Illustration 1	g06008557

Solution

To diagnose the problem, perform the steps prior to sensor replacement.

• Check the harness connection.

• Check the pins of the connector.

• Check the wire tie that is holding the pig tail of the sensor, since the tie may be too tight.