HOSE 3896820 - Caterpillar

Illustration 1 g01727455
Connections of the +8 volt sensor supplies
The sensor supply is a power supply that is internal to the ECM. The sensor supply provides +8 VDC to operate the sensors.This diagnostic code will be recorded when the Brake ECM reads the voltage for the circuit of the sensor supply as being below normal.The possible causes of the diagnostic code are listed:
The output of sensor supply has an open circuit.
A sensor has failed.
The ECM has failed. This situation is unlikely.Note: 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. Verify that all connections in the circuit are clean and secure. Verify that all connections in the circuit 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. The following test procedure may cause other diagnostic codes to be activated. Ignore these created diagnostic codes and clear the diagnostic codes when the problem has been corrected. Verify that the CID 0041 FMI 04 is active before performing this procedure.Test Step 1. CHECK THE VOLTAGE AT THE ECM.
Turn the disconnect switch and the key start switch to the ON position.
Check the voltage at the harness connector for the ECM from contact J1-44 (wire A700-OR(Orange)) to contact J1-45 (C243-BK(Black)). Use the multimeter probes to measure the voltage. Do NOT disconnect the machine harness from the ECM.Expected Result:The voltage is 8.0 0.5 VDC.Results:
OK - The voltage is 8.0 0.5 VDC. The sensor supply voltage is correct. Verify that the same diagnostic code is present. If the diagnostic code is still present, the ECM may have failed.Repair: A failure of the ECM is unlikely. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code is active. Prior to replacing and ECM, contact your dealership for possible consultation with Caterpillar. If the ECM requires replacing, see Testing and Adjusting, "Electronic Control Module (ECM)