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STRAP 4Z8796 - Caterpillar

4Z8796 STRAP Caterpillar parts D8R, D8R II STRAP
Alternative (cross code) number:
Caterpillar 4Z8796 STRAP

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Compatible equipment models: 4Z8796:

TRACK-TYPE TRACTOR  D8R   D8R II   Caterpillar
Number on catalog scheme: 2
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Illustration 1 g01206575
Schematic of the Solenoid Valves (Ride Control)This diagnostic code is associated with ride control solenoid valve #1. The FMI 06 means that the ECM has determined that the current is above normal.The possible causes of this diagnostic code are listed:
The energizer circuit of the solenoid is shorted to ground.
The solenoid has failed.
The ECM has failed. An ECM failure is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2129 - FMI 06 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.System Response:When this diagnostic code occurs, the ride control function will stick in a balance position. The other two ride control solenoids are not energized. The operator does not have ride control that is independent of the switch setting.Test Step 1. CHECK THE SOLENOID.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Observe the status of the diagnostic code.
Disconnect the solenoid with the active diagnostic code from the machine harness. Expected Result:The FMI 06 changes to FMI 05 after the solenoid is disconnected.Results:
YES - The FMI 06 changes to FMI 05 after the solenoid is disconnected. The circuit is correct.Repair: The solenoid has failed. Replace the solenoid. Verify that the new solenoid has corrected the problem.STOP
NO - The FMI 06 remains active. Proceed to Test Step 2.Test Step 2. CHECK THE SOLENOID ENERGIZER CIRCUIT FOR A SHORT TO GROUND
Turn the key start switch and the disconnect switch to the OFF position.
Ride Control Solenoid Valve #1 remains disconnected from the machine harness.
Disconnect the machine harness connectors from the ECM.
At the machine harness connector for the ECM, measure the resistance from J2-5 wire (976-OR) to all contacts that are used in the machine harness connectors for the ECM.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NO - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between the signal circuit for Ride Control Solenoid Valve #1 and the circuit with the low resistance measurement.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors and clean the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 2129 - FMI 06.Expected Result:The CID 2129 - FMI 06 is active.Results:
YES - The CID 2129 - FMI 06 is active. The diagnostic code has not been corrected. The ECM may have failed.Repair: An ECM failure is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Refer to Testing and

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