LINK-EXTENSION 6P5095 - Caterpillar

Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections may 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.Possible causes for an FMI 2 diagnostic code are:
A charging system component has failed.
Intermittent connection in the battery circuit for the ECM.
The ECM has failed. A failure of the ECM is unlikely.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. A failure of the ECM 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. A failure of the ECM is unlikely.
Illustration 1 g03481956
Schematic for the Power Supply for the Transmission ECM
Note: The diagram above is a simplified schematic of the System Voltage connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the Electrical Schematic, UENR3118Diagnostic 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. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a troubleshooting procedure.
Table 2
Troubleshooting Test Steps Values Results
1. Identify Active FMI Code Associated With The System Voltage Circuit
Code present. FMI 2 diagnostic code, proceed to Test Step 2.
FMI 3 diagnostic code, proceed to Test Step 4.
FMI 4 diagnostic code, proceed to Test Step 7.
Begin Process For FMI 2 Troubleshooting HERE
2. Test The Battery
A. Turn Key start switch to the ON position.
B. Observe the status of the diagnostic code.
The diagnostic code is NOT active. OK - The diagnostic code is NOT active.
Proceed to Test Step 3.
NOT OK - The diagnostic code is active.
Repair: See Special Instruction, SEHS7633, "Battery Test Procedure".
STOP
3. Check If The Diagnostic Code Is Still Active
A. Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, corrosion, or chafing.
B. Perform a 45 N (10 lb) Pull Test on each of the wires that are associate with the circuit.
C. Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened.
D. Turn the disconnect switch