HOSE AS 3455748 - Caterpillar

Which Generate This Code:This diagnostic code is associated with the 5 volt power supply for the sensors. The FMI 03 means that the ECM has determined that the voltage of the sensor circuit is higher than normal.Possible causes of this diagnostic code are listed below:
The power supply circuit is shorted to a higher voltage source.
The ECM has failed. This 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. Verify that all of the connections in the circuit are clean and secure. 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. Ignore these created diagnostic codes and clear the diagnostic codes when the problem has been corrected. Verify that the CID 0262 FMI 03 is active before performing this procedure.Use a digital multimeter for the measurements in this procedure.Test Step 1. CHECK FOR THE CORRECT VOLTAGE AT THE ECM
Turn the disconnect switch and the key start switch to the ON position.
Check the voltage at the ECM connector for sensor supply to a ground contact. Do not disconnect the machine harness from the ECM.Expected Result:The voltage is 5.0 0.5 DCV.Results:
OK - The voltage is 5.0 or 0.5 DCV. The sensor supply voltage is correct. Verify that the diagnostic code is present. If the diagnostic code is still present, the ECM may have failed.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Prior to replacing an ECM, always contact your dealership's Technical Communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Troubleshooting, "Electronic Control Module (ECM) - Replace".STOP
NOT OK - Voltage is greater than 5.0 0.5 DCV. The sensor supply voltage is not correct. Proceed to Test Step 2.Test Step 2. CHECK THE HARNESS FOR A SHORT TO THE +BATTERY CIRCUIT
The disconnect switch and the key start switch remain in the ON position.
Disconnect the machine harness from the ECM.
At the machine harness connector for the ECM, measure the voltage from the contact for sensor supply to a ground contact.Expected Result:The voltage is 0.0 0.5 DCV.Results:
OK - The voltage is 0.0 0.5 DCV. The voltage is correct. The ECM may have failed.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Prior to replacing an ECM, always contact your dealership's Technical Communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Troubleshooting, "Electronic Control Module (ECM) - Replace".STOP
NOT OK - Voltage is not 0.0 0.5 DCV. The harness has failed.Repair: The machine harness is shorted to the +battery circuit. Repair the machine harness or replace the machine harness.STOP