HARNESS AS-CHASSIS 3568799 - Caterpillar

Illustration 1 g01377699
Left front drive motor speed sensor circuitThis diagnostic code is recorded when there is no input signal from a left speed sensor number two in the manual mode.The following conditions activate this diagnostic code:
Sensor power wire (T800-OR) open
Sensor return wire (J767-GY) open
Sensor return wire (J767-GY) shorted to the + battery circuit
Signal wire (J713-BR) open.
Signal wire (J713-BR) shorted to the + battery circuit
Signal wire (J713-BR) shorted to ground
Faulty sensor
Failed left drive pump
Failed left charge pump
Low charge pressure
Failed pump input gears
Failed pump shaft
Failed ECMTest Step 1. VISUALLY VERIFY THAT THE FRONT WHEELS ARE SPINNING
Select forward direction.
Select maximum "Creep" speed.
Engage AWD "Creep" mode.
Lower the blade to lift the front wheels off the ground.
Verify that the green AWD indicator is illuminated.
Select reverse direction.
Select maximum "Creep" speed.
Engage AWD "Creep" mode.
Lower the blade to lift the front wheels off the ground.
Verify that the green AWD indicator is illuminated.Expected Result:Both front wheels turn in both forward and reverse directions in "Creep" mode. The green AWD indicator illuminates.Results:
NOT OK - Green AWD Indicator does not activate. Repair: Check Caterpillar® Electronic Technician (Cat® ET) service tool for other active AWD diagnostics or events. Clear the diagnostic codes that are active. Proceed to Test Step 2.
OK - Both front wheels spin as expected. Proceed to Test Step 2.
One or both wheels do not spin when commanded in one or both directions. - Proceed to Test Step 3.Test Step 2. CHECK THE SPEED SENSOR
Perform the Testing and Adjusting, "Speed Sensor - Test" procedure.Expected Result:Speed sensors read correct speed and direction.Results:
OK - Speed and direction are correct. There is an intermittent open circuit or a short circuit in the harness of the speed sensor. Repair: Repair or replace the harness.STOP
NOT OK - Speed and direction are incorrect. Repair: See the Troubleshooting, "MID 075 - CID 2320 - FMI 02" Story in this manual. After completing, "MID 075 - CID 2320 - FMI 02", return to this story. Proceed to Test Step 3.Test Step 3. CHECK THE CLUTCH PRESSURE
Perform the Testing and Adjusting, "Solenoid Valve (Control Manifold) - Test" procedure.Expected Result:Clutch pressure is in the test procedure tolerance.Results:
OK - Clutch pressure is in the test procedure tolerance. Proceed to Test Step 4.
NOT OK - One or more clutch pressures are not in the test procedure tolerance.Repair: Correct the clutch pressure. Proceed to Test Step 1.Test Step 4. CHECK THE PUMP SOLENOID
Perform the Testing and Adjusting, "Solenoid Valve (Pump Displacement) - Test" procedure.Expected Result:Readings of the pump control pressure are within the specification provided in the test procedure.Results:
OK - Readings of the pump control pressure are within the specification provided in the test procedure. Proceed to Test Step 5.
NOT OK - Readings of the pump control pressure are not within the specification provided in the test procedure. Repair: Follow diagnostic steps that are defined in the Test procedure for the Solenoid Valve (Pump Displacement). Repeat the Test Step 1 after correcting any problems.Test Step 5. AUDIBLE CHECK FOR MOTOR SPEED
Start the engine.
Set engine speed to 800 RPM.
Override the left front drive