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Electronic Control Module (Power Train)Inout Output

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    Systems Operation966G Series II Wheel Loader and 972G Series II Wheel Loader Power Train

    Electronic Control Module (Power Train)

    SMCS -7610-DTN

    The power train electronic control module (ECM) is located on the back wall of the cab to the right ofthe operator's station. The power train ECM shifts the transmission. The operator input indicates thedesired speed for the transmission and the desired direction for the transmission. The power train ECM

    makes decisions that are based on the input information and on the memory information. After thepower train ECM receives the input information and the memory information, the power train ECMsends a corresponding response via the outputs. The inputs and outputs of the power train ECM areconnected to the machine harness. Use contact connectors J1 and J2.

    Inputs

    The machine has several input devices. Input devices inform the power train ECM of the operatingconditions of the machine. The machine has inputs from switches and sensors. Switches provide an

    Media Number -RENR4386-05 Publication Date -01/05/2003 Date Updated -19/05/2003

    i01775614

    View Image

    Illustration 1 g00291779

    Power Train Electronic Control Module (ECM)

    (1) Connector J1. (2) Connector J2.

    Page 1 of 7Service Information System

    4/5/2011https://sis.cat.com/sisweb/sisweb/techdoc/content.jsp?calledpage=/sisweb/sisweb/mediasear...

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    open, a ground or a +battery to the inputs of the implement ECM. Sensors provide a constantly changingsignal to the power train ECM. The inputs into the implement ECM are listed in the tables that follow.

    Outputs

    The power train ECM responds to decisions by sending electrical signals through the outputs. The

    outputs can create an action or the outputs can provide information to the power train ECM. The outputsfor the implement ECM are listed in the tables that follow.

    Input/Output

    The CAT Data Link is used to communicate with the other electronic control modules on the machine.The CAT Data Link is bidirectional. This allows the power train ECM to receive information and thisallows the power train ECM to send information. The CAT Data Link allows the sharing of informationwith other electronic controls.

    A module identifier (MID) is assigned to all of the electronic controls that use the CAT Data Link. The

    MID for the power train ECM is 081.

    Reference: For more information on the CAT Data Link, refer to the Service Manual module SystemsOperation, "CAT Data Link" for the machine that is being serviced.

    Reference: For more information on the Caterpillar Monitoring System, refer to the Service Manualmodule Systems Operation, "Monitoring System (Power Train Functions)" for the machine that is beingserviced.

    Conventional Steering Machines

    Table 1

    J1 Connector (Power Train ECM)Machines Equipped with Conventional Steering

    No. Function Type

    1 Battery (+) Power

    2 Ground Ground

    3 Cat Data Link (-) Input/Output

    4 Secondary Steering Intermediate Relay Solenoid Output

    5 Ground Ground

    6 Battery (+) Power

    7 Solenoid and Indicator Return Output Return

    8 Start Relay (-) Solenoid Output

    Page 2 of 7Service Information System

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    11 Secondary Steering Pressure Switch (N/O) Switch Input

    12 Sensor/Indicator Power Supply (+8V) Sensor Supply +8V

    14 Transmission Output Speed (-) Frequency Input

    18 Transmission Oil Temperature Pulse Width Modulated

    20 Transmission Output Speed (+) Frequency Input

    22 Fuel Pressure Indicator Output

    23 Transmission Input Speed (-) Frequency Input

    25 Transmission Output Speed Trailing (+) Frequency Input

    28 Transmission Filter Indicator Output

    29 Transmission Input Speed (+) Frequency Input

    31 Transmission Output Speed Trailing (-) Frequency Input

    37 Backup Alarm (+24V) Solenoid Output

    38 Engine Speed Frequency Input

    40 Fuel Level Low Indicator Output

    Copyright 1993 - 2011 Caterpillar Inc.

    All Rights Reserved.

    Private Network For SIS Licensees.

    Tue Apr 5 14:59:48 UTC+0430 2011

    Page 7 of 7Service Information System


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