PULLEY-FAN 9L4247 - Caterpillar

TROUBLESHOOTING PROCEDURE
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 The Active DTC Associated With The Can A Data Link     Code present     DTC 1639-9, proceed to Test Step 2.    
Begin Process For DTC 1639-2 Troubleshooting HERE    
2. INSPECT THE HARNESS CONNECTIONS
A. Turn the disconnect switch to the OFF position
B. Inspect all harness connections that are related to the CAN Data Link. Make sure that the connectors are clean and tight
C. Check the connectors for proper mating. Ensure that all the seals are present and in place
D. Check the harness for signs of damage or abrasion
E. Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector
F. Check the exposed wires at the connectors for nicks or signs of abrasion
G. Check for moisture inside the connector
H. Check the connectors for dirty contacts or corroded contacts
I. Check each pin and each socket of the machine harness connectors. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together    
The machine harness connectors are tight and free of corrosion     OK - The machine harness connectors are tight and free of corrosion
Proceed to Test Step 3.
NOT OK - The machine harness connectors are in need of repair
Repair: Repair the machine harness or replace the machine harness
STOP    
2. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS
A. Verify that the following information is correct:
The part number of the flash software for the Implement ECM
The part number of the flash software for the Machine Security System ECM
The part number of the Implement ECM
The part number of the Machine Security System ECM     All of the part numbers are correct     OK - All of the part numbers are correct
NOT OK - All of the part numbers are not correct
Repair: The Implement ECM or the Machine Security System ECM has the wrong part number or incorrect flash software is installed. Flash the correct software or replace the incorrect Implement ECM or the Machine Security System ECM with a module that has the correct part number. See the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" section for additional information
Note: A resistance that is greater than 60 ohms but less than 5K ohms would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K ohms would