ROLLER GP-TRACK-DOUBLE FLANGE 2280964 - Caterpillar

Illustration 1 g00546364
MODULATION SWITCH/DISPLACEMENT SOLENOID GRAPHICSSystem Response:This fault can be active when the key start switch is turned ON. 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 will be 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 harness connector from the reverse pump displacement solenoid valve.
Use a 6V-7070 Digital Multimeter in order to measure the resistance at the machine harness. Measure the resistance between contact 1 (wire 797-PU) and contact 2 (wire 912-GY). The resistance should be approximately 30 ohms.Schematic...
Illustration 2 g00546364
MODULATION SWITCH/DISPLACEMENT SOLENOID GRAPHICSExpected Result:The resistance is approximately 30 ohms.Results:
No - Proceed to test step 3.
Yes - Proceed to test step 4.Test Step 3.
Replace the reverse pump displacement solenoid valve. Use a new Caterpillar part for replacement.PartsReference: Refer toTroubleshooting, "115-1517 ACTUATOR GP-PUMP PIN 1AL1-UP. PART OF 6E-3471 PUMP GP-PISTON".SpecificationsReference: Refer toTroubleshooting, "Piston Pump (All Wheel Drive)".Schematic...
Illustration 3 g00546364
MODULATION SWITCH/DISPLACEMENT SOLENOID GRAPHICSExpected Result:The reverse pump displacement solenoid valve has been replaced.Results:
Repair Complete - Stop.Test Step 4.
Use a 6V-7070 Digital Multimeter in order to measure the resistance at the harness connector. Check for continuity between contact 2 (ground return) and the frame ground. Measure the resistance between contact 2 (ground return) and the frame ground. The resistance should be less than 5000 ohms.Schematic...
Illustration 4 g00546364
MODULATION SWITCH/DISPLACEMENT SOLENOID GRAPHICSExpected Result:The resistance is less than 5000 ohms.Results:
Yes - Proceed to test step 5.
No - Proceed to test step 6.Test Step 5.
Connect the harness connector to the reverse pump displacement solenoid valve. 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. Check for continuity between contact 10 (wire 797-PU) and contact 39 (wire 912-GY). Measure the resistance between contact 10 (wire 797-PU) and contact 39 (wire 912-GY). The resistance should be approximately 30 ohms.Schematic...
Illustration 5 g00550731
ECMExpected Result:The resistance is approximately 30 ohms.Results:
Yes - Proceed to test step 7.
No - Proceed to test step 6.Test Step 6.
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 7.
Clean the contacts on the harness for the all wheel drive ECM. Connect the harness 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.
Check the all wheel drive ECM for the 391-05 fault code.How...Reference: Refer toTroubleshooting, "Using The ECM Display For Troubleshooting".Expected Result:The 391-05 fault code is present.Results:
Yes - Proceed to test step 8.
No - The fault does not exist at this time. The initial fault was probably caused by a poor electrical