HOSE ASSEM. (24.80 in. long overall) 8D5246 - Caterpillar

Power Train ECM
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the sensor power supply circuits of the machine.
Table 2
Power Train ECM (MID 264)
DTC Description System Response
41 - 3 8 V Supply: Voltage Above Normal Sensors powered by the 8 V supply will not function properly.
41 - 4 8 V Supply: Voltage Below Normal Sensors powered by the 8 V supply will not function properly.
1482 - 3 10 V Supply: Voltage Above Normal Sensors powered by the 10 V supply will not function properly.
1482 - 4 10 V Supply: Voltage Below Normal Sensors powered by the 10 V supply will not function properly. The diagnostic code is recorded when the interface module indicates that the voltage of the sensor supply circuit is too high, too low, or erratic.Possible causes of an FMI 3 Diagnostic code are:
The output of the sensor supply has shorted to the + battery circuit.
The ECM has failed. An ECM failure is unlikelyPossible causes of an FMI 4 Diagnostic code are:
The output of sensor supply has an open circuit.
A sensor has failed.
The ECM has failed. An ECM failure is unlikely.
Illustration 3 g03360056
Schematic of the Power Train 8 VDC Sensor Supply Voltage
Illustration 4 g03360134
Schematic of the Power Train 10 VDC Sensor Supply Voltage
Note: The diagrams above are a simplified schematic of the Power Train ECM connections. The diagrams are electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of the Electrical Schematic, KENR5639 for the complete schematic.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure. For sensors powered via the fuse panel, check the condition of the appropriate fuse before beginning the troubleshooting procedure.
Table 3
Troubleshooting Test Steps Values Results
1. Identify The Active FMI Code Associated With The Sensor Supply Circuit Code present FMI 3 diagnostic code proceed to Test Step 2.
FMI 4 diagnostic code proceed to Test Step 4.
Begin Process For FMI 3 Troubleshooting HERE
2. Check The Voltage At The ECM
A. Turn the key start switch and the battery disconnect switch to the OFF position.
B. At the machine harness connector for the ECM, insert a 7X-1710 Multimeter Probe along the contact for the sensor power. Insert another probe along the return contact for the sensor power.
C. Turn the disconnect switch to the ON position.
D. Observe the voltage measurement for the multimeter and wiggle the machine harness connectors of the ECM. Gently pull on the wires and move the wires around.
See the schematic to determine the voltage that is applicable to each circuit. OK - The voltage is appropriate for the circuit as determined by the schematic.
Proceed to Test Step 3.
NOT OK -