SENSOR GP-ENGINE 1634052 - Caterpillar

Illustration 1 g01079534
Schematic for hydraulic sensorThis diagnostic code is associated with the hydraulic pressure sensor. The FMI 03 means that the ECM has determined that the voltage of the circuit for the sensor is above normal. Refer to Systems Operation, "Sensors" for information regarding the operation of the sensor and the location.The possible causes of this diagnostic code are listed below:
The signal circuit for the sensor is open.
The signal circuit for the sensor is shorted to the positive battery circuit.
The sensor has failed.
The power circuit or the ground circuit has failed.
The ECM has failed. This is unlikely.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 has been corrected. Ensure that the diagnostic code of CID 2233 FMI 03 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:When this diagnostic code is active the hydraulic control system will default to the "Auto Not Allowed" state.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 back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe into contact "A".
Measure the voltage from contact "A" to frame ground.Expected Result:The voltage measurement is 5 VDC.Results:
OK - The voltage measurement is 5 VDC. Proceed to Test Step 2.
NOT OK - The voltage measurement is not 5 VDC. The positive battery circuit in the machine harness has failed.Repair: Replace the machine harness or repair the machine harness.STOPTest Step 2. CHECK THE WIRING HARNESS OF THE SENSOR FOR AN OPEN CIRCUIT.
The key start switch and the disconnect switch remain in the OFF position.
Disconnect the machine harness from the sensor.
At the harness connector for the sensor, connect a jumper wire between contact "B" and contact "C".
Disconnect the machine harness connector(s) from the ECM.
At the harness connector for the ECM, measure the resistance between contact J1-21 (wire L731-BR) and contact J1-36 (wire Y920-BU).Expected Result:The resistance measurement is less than 5 ohms.Results:
OK - The resistance measurement is less than 5 ohms. The circuit is correct. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5 ohms. The circuit is not correct. 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 3. CHECK THE WIRING HARNESS OF THE SENSOR FOR A SHORT TO THE +BATTERY CIRCUIT.
The key start switch and the disconnect switch remain in the OFF position.
The machine harness remains disconnected from the sensor. Remove the jumper wire that was installed in the previous step.
The machine harness connector(s) remains disconnected from the ECM.
At the machine harness connector for the ECM, measure the resistance from the signal contact J1-36 (wire Y920-BU) of the machine harness to all contacts that are used in the machine harness connectors for the ECM.Expected Result:Each resistance