CAP (steering oil filter) 9D6159 - Caterpillar

Power Train ECM
The following is a list of diagnostic codes that are associated with the sensor power supply circuits of the machine.
Table 2
Power Train ECM (MID 264)
DTC Code Description System Response
41-3 8 VDC Supply: Voltage above normal Sensors powered by the 8 VDC supply may not function properly.
41-4 8 VDC Supply: Voltage below normal Sensors powered by the 8 VDC supply may not function properly.
262-3 5 VDC Sensor DC Power Supply: Voltage above normal Sensors powered by the 5 VDC supply will not function properly.
262-4 5 VDC Sensor DC Power Supply: Voltage below normal Sensors powered by the 5 VDC supply will not function properly.
1482-3 10 VDC Sensor Power Supply: Voltage above normal Sensors powered by the 10 VDC supply may not function properly.
1482-4 10 VDC Sensor Power Supply: Voltage below normal Sensors powered by the 10 VDC supply may not function properly. Possible causes for an FMI 3 diagnostic code are:
The sensor supply or the ground circuit in the machine harness is open.
The signal circuit in the machine harness is shorted to another circuit.
The signal circuit in the machine harness is open or the sensor is disconnected.
The sensor has failed.
The ECM has failed. An ECM failure is unlikely.Possible causes for an FMI 4 diagnostic code are:
The signal circuit in the machine harness is shorted to ground.
The sensor has failed.
The ECM has failed. An ECM failure is unlikely.
Illustration 2 g03389286
Schematic of the Power Train ECM Sensor Supply
Note: The diagram above is a simplified schematic of the Power Train ECM and the PWM Sensor connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest version of the Electrical Schematic for the complete schematic:(D8T) Electrical Schematic, UENR1394(D9T) Electrical Schematic, KENR8948Diagnostic 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