PUMP GP-ENGINE OIL 2122270 - Caterpillar

Illustration 1 g02472977
Connections of the 8 V power supply
This diagnostic code is associated with the 8 V power supply of the ECM. The 8 V power supply provides power for the left joystick, the left steer cylinder position sensor and the number two and three steering position sensors.The CID 0041 FMI 04 diagnostic code is recorded when the ECM reads the sensor supply circuit voltage and the voltage is below normal.The following conditions could cause this diagnostic code:
A sensor has failed.
The sensor supply circuit is shorted to a ground source.
The ECM has failed. This condition is unlikely.Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Visually inspect the connections for the following:
Connections are clean.
Connections are secure.
Connections are in good condition.If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.Note: The following test procedure may create other diagnostic codes. Clear these created diagnostic codes when the problem has been corrected. Test Step 1. CHECK THE SENSORS
Turn the key start switch and the disconnect switch to the OFF position.
While observing the status of the diagnostic code as each component is disconnected, disconnect the following:
Disconnect the machine harness connector from the connectors P-C2, and P-C5 of the left joystick.
Disconnect the machine harness connector from the left steer cylinder position sensorExpected Result:The CID 0041 FMI 04 diagnostic code is no longer active when one of the components in the supply circuit is disconnected.Results:
YES - The diagnostic code is not active when one of the components in the supply circuit is disconnected. The power supply circuit is correct. The sensor is disconnected when the diagnostic code that is cleared fails.Repair: Repeat this test step in order to determine the component that causes the problem. Replace the component that is causing the problem.STOP
NO - The diagnostic code is still active. Disconnecting the components in the circuit did not affect the status of the diagnostic code. Proceed to Test Step 2.Test Step 2. CHECK THE POWER SUPPLY AT THE ECM
Turn the disconnect switch and the key start switch to the OFF position.
At connector J1 of the Machine, use a 151-6320 Removal Tool to remove the following from the connector:
The supply wire and the socket at contact J1-44 (wire R800-OR(Orange))
The return wire and the socket at contact J1-45 (wire J842-BK(Black))The machine harness connector J1 remains connected to the ECM.
Turn the disconnect switch and the key start switch to the ON position.
Use the multimeter probes in order to make contact on the connector pins of the ECM. Measure the voltage at the ECM pins between the contact of the power supply J1-44 and the return contact J1-45. Expected Result:The voltage measurement is 8.0 0.3 VDC.Results:
OK - The voltage measurement is 8.0 0.3 VDC. The voltage is correct. The ECM power supply is correct. Install the wires and the sockets that were removed from