Allison Transmission WTECIII Instrukcja rozwiązywania problemów

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Allison WTECII & WTECIII ECU's (TCM's) Power Failure

Caution!!: The following procedures are technical and should not be attempted if you are unfamiliar with

electronics or uncomfortable working with electrical components. Doing this troubleshooting method is at

your own risk. Although this procedure has been recommended by other Monaco Owners, it should be

used with caution. If in doubt, contact Transmission Instruments

Have you recently replaced or charged the battery outside the vehicle? If yes, recheck connections in

your battery compartment and look for two 10 gauge wires. These are near the battery terminals which

supplies positive and negative power directly to your ECU through VIM (Vehicle Interface Module). The

VIM contains two fuses [for ECU only] and up to six relays powered by the ECU (including the start relay).

Recommended Tools :

Light Bulb Type Continuity Tester. Available at many autoparts stores.

Alternative: Assemble 12V/15-25W light bulb (spare brake lamp bulb or similar – #1156, #1073 etc.) with 20 gauge solid

copper wire (ordinary hookup or "bell wire"). Strip 1/2" on test side.

When you check ECU connectors, the lamp must glow bright white light. A dim light will indicate a bad

connection somewhere; likely due to oxidization.

A voltmeter will not indicate bad connections. An ordinary voltmeter or VOM isn't reliable for this test.

However you will need one to check the lower voltage systems.

 After assembly, check lamp directly on your battery terminals. Caution lamp will become

HOT!

 Always disconnect the battery or turn off the battery switch (Power Train Battery) prior to

disconnecting or reconnecting ECU connectors!

Brought to you by the Monaco Parts List Project:

Troubleshooting Guide

Reference:

Page 1 of 4

http://www.visualsc.com/monaco_parts.php

https://www.transmissioninstruments.com/troubleshooting/

for advice.

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