VALVE AS-RELIEF 1039725 - Caterpillar

Illustration 1 g00803836
Schematic for the Auxiliary Lever Position Sensor
This diagnostic code is recorded when the ECM reads the voltage of the circuit for the position sensor as being above normal. The auxiliary lever position sensor is a PWM sensor. The signal wire for the position sensor connects to connector contact J2-6 (wire G942-OR(Orange)) of the ECM.The causes for this diagnostic code are listed:
The signal circuit is shorted to the +battery circuit.
The sensor has failed.
The signal circuit is open.
The ground circuit is open.System Response:The machine response is listed:
The auxiliary function will be disabled until the diagnostic code is cleared. Also, the lever must be recentered.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code is corrected. Note: Ensure that the diagnostic code is active.Test Step 1. CHECK FOR POWER AT THE SENSOR.
Do not disconnect the harness connector from the sensor.
Turn the key start switch and the disconnect switch to the ON position.
At the harness connector for the sensor, measure the voltage from contact A to contact B. Use the 7X-1710 Multimeter Probes. Expected Result:The voltage is the system voltage.Results:
YES - The voltage is system voltage. Proceed to Test Step 2.
NO - The voltage is not system voltage. The + battery circuit in the machine harness has failed.Repair: Replace the machine harness or repair the machine harness.STOPTest Step 2. CHECK FOR PROPER GROUND AT THE SENSOR.
The machine harness remains connected to the sensor.
Turn the key start switch and the disconnect switch to the OFF position.
At the harness connector for the sensor, measure the resistance from contact B to frame ground. Use the 7X-1710 Multimeter Probe. Expected Result:The resistance is less than 5 ohms.Results:
YES - The resistance is less than 5 ohms. The ground circuit is correct. Proceed to Test Step 3.
NO - The resistance is greater than 5 ohms. The ground circuit in the machine harness has failed.Repair: Replace the machine harness or repair the machine harness.STOPTest Step 3. CHECK THE WIRING HARNESS OF THE POSITION SENSOR FOR AN OPEN CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the position sensor.
At the harness connector for the sensor, connect a jumper wire between contact B and contact C.
Disconnect machine harness connectors from the ECM.
At the harness connector for the ECM, measure the resistance between contact J2-6 (wire G942-OR(Orange)) and contact J1-2 (wire A272-BK(Black)). Expected Result:The resistance measurement is less than 5 ohms.Results:
YES - The resistance measurement is less than 5 ohms. Proceed to Test Step 4.
NO - The resistance is greater than 5 ohms. There is an open circuit in the wiring harness.Repair: There is an open circuit in the wiring harness. Repair the wiring harness or replace the wiring harness.STOPTest Step 4. CHECK THE WIRING HARNESS OF THE POSITION SENSOR FOR A SHORT TO THE +BATTERY CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
The machine harness remains disconnected from the