GEAR GP-BEVEL & TRANSFER 3523191 - Caterpillar

Illustration 1 g00553691
MODULATION SWITCH\DISPLACEMENT SOLENOID VALVESSystem Response:The fault should not be active when the machine is stopped and the engine has been shut off. When this fault is active and the all wheel drive system is ON (AUTOMATIC or MANUAL), the all wheel drive ECM will enter the diagnostic operating mode. The all wheel drive system will shut off and a category three warning is activated. Test Step 1. Perform the following test: Machine Preparation for TroubleshootingResults:
OK - Proceed to test step 2.Test Step 2.
Turn the key start switch to the OFF position. Disconnect the machine harness from the all wheel drive modulation pressure switch.
Use a 6V-7070 Digital Multimeter in order to measure the resistance at the machine harness. Measure the resistance between the contact 1 (wire F769-BU) and contact 2 (wire 202-BK). The resistance should be at least 5000 ohms.Schematic...
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MODULATION SWITCH\DISPLACEMENT SOLENOID VALVESExpected Result:The resistance is at least 5000 ohms.Results:
Yes - Proceed to test step 3.
No - Proceed to test step 4.Test Step 3.
Turn the key start switch to the OFF position. Disconnect the harness from the all wheel drive ECM.
Use a 6V-7070 Digital Multimeter in order to measure the resistance at the harness for the all wheel drive ECM. Measure the resistance between the contact 4 (wire F769-BU) and contact 2 (wire 202-BK). The resistance should be at least 5000 ohms.Schematic...
Illustration 3 g00550731
ECMExpected Result:The resistance is at least 5000 ohms.Results:
No - Proceed to test step 5.
Yes - Proceed to test step 6.Test Step 4.
Replace the all wheel drive modulation pressure switch. Use a new Caterpillar part for replacement.How...Reference: Refer to Troubleshooting, "Transmission Hydraulic Control Valve".PartsReference: Refer to Troubleshooting, "145-9532 CONTROL GP-TRANSMISSION HYD S/N 4LY459-UP. PART OF 144-2233 TRANSMISSION AR".Schematic...
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MODULATION SWITCH\DISPLACEMENT SOLENOID VALVESSpecificationsReference: Refer to Troubleshooting, "All Wheel Drive Modulation Pressure Switch".Expected Result:The all wheel drive modulation pressure switch has been replaced.Results:
Repair Complete - Stop.Test Step 5.
Repair the faulty harness or replace the faulty harness. Use new Caterpillar parts for replacement.Expected Result:The harness has been repaired or the harness has been replaced.Results:
Repair Complete - Stop.Test Step 6.
Clean the contacts on the machine harness and the harness for the all wheel drive ECM.
Connect the machine harness to the all wheel drive modulation pressure switch. Connect the harness for the all wheel drive ECM to the all wheel drive ECM.
Turn the key start switch to the ON position. Put the all wheel drive ECM in the service mode. Clear all the inactive faults from the all wheel drive ECM.
Start the engine and operate the engine in high idle. Turn the all wheel drive control to the ON (AUTOMATIC or MANUAL) position. Operate the machine in fourth speed forward through seventh speed forward. The engine speed must exceed 500 rpm. Depress the inching pedal and release the inching pedal several times during machine operation.
Stop the machine and shut off the engine. Check the all wheel drive ECM for the 380-02 fault code.How...Reference: Refer to Troubleshooting, "Using The ECM Display For Troubleshooting".Expected Result:The 380-02 fault code is present.Results:
Yes - Proceed to