False Intake Manifold Air Temperature Causing Shutdown on Certain G3412 Engines with EMCP 4.2 Panels{1920, 4490, 7490} Caterpillar

Engine:

G3412 (S/N: R7A1-UP; KAP1-UP)

G3412C (S/N: SPY1-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 location of intake manifold air temperature (IMAT) switch does not allow for enough intake air to flow around sensing probe. That coupled with proximity of the turbocharger allows for additional heat soaking of the separate circuit aftercooler (SCAC) housing at the mounting location of switch.

Resolution

Disable digital input #1 on the EMCP 4.2 panel. The engine is still protected by the detonation detection if there is true high IMAT temperature.

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Illustration 1	g03850503

1. Click on the Configuration Tool Icon.

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Illustration 2	g03850504

2. Click on "EMCP 4.2"

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3. Click on "Digital Inputs".

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Illustration 4	g03850506

4. Select "Disable" in the "Digital Input #1 Usage Type" drop-down menu.

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