COVER-TORQUE CONVERTER 8E8158 - Caterpillar

Illustration 1 g02408297
Machine Control ECM 8 VDC Sensor Power Supply connectionsThis diagnostic code is associated with the Machine ECM 8 VDC sensor power supply. The 8 VDC sensor power supply provides power for three pressure sensors on the machine. The pressure sensors are:
The "Brake System" Pressure Sensor.
The "Boom Cylinder Head End" Pressure Sensor.
The "Boom Cylinder Rod End" Pressure Sensor.The CID 0041 FMI 03 diagnostic code is activated when the ECM detects that the voltage of the power supply circuit is higher than normal.The following conditions could cause this diagnostic code:
The power supply circuit is shorted to a voltage source.
The Machine ECM has failed. A failure of the ECM is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the problem has been corrected. Verify that the CID 0041 FMI 03 is active before performing this procedure.Test Step 1. CHECK THE POWER SUPPLY AT THE ECM
Turn the disconnect switch and the key start switch to the OFF position.
At ECM connector J1, use a 151-6320 Removal Tool or a similar tool to remove the supply wire and socket at contact J1-44 (wire E774-GN) and the return wire and socket at contact J1-45 (wire 998-BR) from the connector. The machine harness connector J1 remains connected to the ECM.
Turn the disconnect switch and the key switch to the ON position.
Use the multimeter probes to contact the ECM connector pins. Measure the voltage at the ECM pins between the power supply contact J1-44 and the return contact J1-45.Expected Result:The voltage measurement is 8.0 0.4 VDC.Results:
OK - The voltage measurement is 8.0 0.4 VDC. The voltage is correct. The ECM power supply is correct.
Install the wires and sockets that were removed from the J1 connector back into the original locations. Proceed to Test Step 2.
NOT OK - The voltage measurement is greater than 8.0 0.4 VDC. The ECM power supply is not correct.Repair: Contact the Technical Communicator at your dealership for possible consultation with Caterpillarabout the problem.STOPTest Step 2. CHECK FOR A SHORT CIRCUIT IN THE MACHINE HARNESSThe machine harness connector remains disconnected from the sensor.
Turn the disconnect switch and the key switch to the OFF position.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At the harness connector J1, measure the resistance from contact J1-44 (wire E774-GN) to all of the other contacts that are used in connectors J1 and J2 for the ECM.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The supply circuit is not shorted to another circuit in the machine harness. Proceed to Test Step 3.
NOT OK - One or more of the resistance measurements is less than 5000 ohms. There is a short in the machine harness between the power supply circuit and the circuit with the low resistance.Repair: Refer to the complete Electrical System Schematic for the machine. Examine all of the connectors in the circuits for points in the machine harness where