LOCK GP-CENTERSHIFT 9D1275 - Caterpillar

Diagnostic Trouble Code (DTC) Root Causes and Schematics
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 03 Diagnostic code are:
The output of the sensor supply has shorted to the +battery circuit.
The Implement ECM has failed. The ECM failing is unlikely.Possible causes of an FMI 04 Diagnostic code are:
The output of sensor supply has an open circuit.
A sensor has failed.
The ECM has failed. This situation is unlikely.
Illustration 2 g03387427
Schematic of the 5 VDC, 8 VDC, and 10 VDC sensor power supply connections for the Implement ECM.
Illustration 3 g03387464
Schematic for the Third Function Lockout Switch connections with the Implement J2 connector.
Note: The diagrams above are a simplified schematic of the ECM connections. The diagrams are electrically correct. However, not all of the possible harness connectors are shown. For machines with serial number prefix (S/N: TWX), refer to Electrical Schematic, RENR9781 for a complete schematic of the machine. For machines with serial number prefix (S/N: LWX), refer to Electrical Schematic, UENR3875 for a complete schematic of the machine.Troubleshooting Procedures
Note: Before performing this procedure, verify that all circuit breakers and all fuses in the charging circuit and the ECM system supply circuit are closed. If a problem with a circuit breaker or a fuse is found, correct the problem, and check for codes before proceeding with the following steps. Note: Poor harness connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all of the connectors involved in the circuit. Verify that all of the connections in the circuit are dry, clean, secure, and in good condition. Each pin and socket in the connectors should mate correctly when the connectors are fastened together. Check for exposed wires at the connectors for nicks or abrasion. If a problem is found with any of the connections: correct the problem and verify that diagnostic code is still active, before performing the following procedures. Perform a wiggle test on the sensor circuit of the machine wiring harness, using Cat ET. The wiggle test can be used to detect open or shorted connections in the machine wiring harness. Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are fastened.
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 Troubleshooting for FMI 03 Diagnostic Code 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.
E. Observe the voltage measurement for the multimeter and wiggle the machine harness