773F, 773F OEM, 777F and 777F OEM Off-Highway Trucks and 775F and 775F OEM Quarry Truck Vital Information Management System (VIMS) Caterpillar

• The Service Meter Hour (SMH) reading

• The system date changes to January 1, 2000

These two values will be notably different than other displayed values. Typically, these values will assume a very large number. When this occurs, the backup battery should be replaced.

Required Tools

The tools that are listed in Table 1 are required in order to replace a failed backup battery.

Procedure

The following steps are required in order to replace a failed backup battery:

1. Safely stop the machine and shutdown the engine.

2. Verify that the disconnect switch is in the OFF position.

3. Verify that the key start switch is in the OFF position.

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Illustration 1	g01235392
Front of ECM

4. Remove the ECM from the machine. See Illustration 1.

5. Clean all dirt and debris from the outside of the ECM in order to prevent foreign material from entering the ECM.

   Note: Foreign material could harm the internal components of the ECM.

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Illustration 2	g01235397
Back of ECM and location of the battery

6. Position the ECM so that the back is up. See Illustration 2.

7. Locate the backup battery. See Illustration 2.

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Illustration 3	g01235137
Bolt that holds down the backup battery

8. Remove the bolt that holds down the backup battery with the 9/32 socket. See Illustration 3.

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Illustration 4	g01243556
Starting to pry the battery out of the ECM with a putty knife

9. Slide a putty knife between the ECM and the backup battery, and pry up and down until sufficient space exists for the tip of a flat head screwdriver. See Illustration 4.

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Illustration 5	g01235152
Prying the battery out of the ECM with a flat head screwdriver

10. Insert the tip of a flat head screwdriver and pry up and down until the backup battery is free from the ECM. See Illustration 5.

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Illustration 6	g01235383
Removing the battery wire from the ECM and placing the battery beside the ECM

11. Pull the backup battery wire out of the ECM and place the backup battery on the side of the ECM. See Illustration 6.

    Note: The battery wire fits snugly in the ECM. Pull the battery wire out of the ECM carefully.

12. Perform the following in order to test the backup battery voltage:
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    Illustration 7	g01235198
    Test points of the battery

    1. Locate the test points on the back side of the connector. See Illustration 7.

       Note: Red is the positive test point and black is the negative test point.

    2. Turn on the multimeter.
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    Illustration 8	g01235203
    Multimeter probes and the test points of the battery

    3. Contact the red probe of the multimeter to the red test point and the black probe of the multimeter to the black test point. See Illustration 8.

    4. Observe the displayed backup battery voltage.

       Note: Check the backup battery voltage while the backup battery is still connected to the ECM. Do not unplug the backup battery until the voltage is verified. The ECM Backup Memory will be erased if the voltage falls to approximately 2.5 volts DC. The backup battery voltage should be between 3 volts DC and 3.6 volts DC. Backup battery voltage that is below 3 volts DC is considered to be too low. Replace a backup battery that has too low voltage.

13. Perform the following in order to replace the backup battery:

    1. Locate the Release tab on the backup battery side of the connector.

    2. Firmly grip both sides of the connector and press on the Release tab.

       Note: Pulling the connector apart by holding the wires at the back of the connector can cause these wire connections to be damaged.

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    Illustration 9	g01235219
    Separating the battery wire from the ECM connector

    3. Separate the backup battery wire from the ECM connector. See Illustration 9.
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    Illustration 10	g01235319
    Battery

    4. Acquire a new backup battery. See Illustration 10.
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    Illustration 11	g01235555
    Connecting the battery wire to the ECM connector

    5. Connect the backup battery wire to the ECM connector. See Illustration 11.

    6. Test the backup battery voltage in accordance with Step 12.

       Note: If this backup battery voltage is not between 3.4 volts DC and 3.6 volts DC then this replacement backup battery should not be installed. Acquire a different backup battery and go to Step 13.e.

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    Illustration 12	g01235357
    Feeding the battery wire into the ECM

    7. Carefully feed the wire back inside the ECM. See Illustration 12.

    8. Position the newbackup battery at the hole for the backup battery in the ECM and line up the holes for the bolt.

       Note: To ensure that the holes are lined up, reinstall the original bolt and begin tightening. Once the threads start to grip, stop tightening and go to Step 13.i.

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    Illustration 13	g01235369
    Pressing the battery into the ECM

    9. Press the backup battery into the ECM.

       Note: Use slip joint pliers in order to press the backup battery into the ECM. Place towels on the jaws of the slip joint pliers in order to prevent damaging the outer surfaces of the backup battery and the ECM. Gently press the backup battery into the ECM with the slip joint pliers and the towels. Alternate pressure on both sides of the backup battery until the battery is firmly seated. See Illustration 13.

    10. Gently seat the bolt with a 9/32 socket.

        Note: The bolt will break when the bolt is overtightened. Do not overtighten the bolt.

    11. Torque the bolt to 2.25 N·m (20 lb in) with a torque wrench and a 9/32 socket.

    12. Reinstall the ECM on the machine.