TUBE 3114959 - Caterpillar

Illustration 4 g01155187
Terminal locations at the solenoid connector for the fan reversing solenoid
(Terminal 1) Fan reversing solenoid
(Terminal 2) Digital return
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring appear to be OK. Proceed to Test Step 3.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Verify Operation of the Engine Fan Reverse Switch
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Turn the battery disconnect switch to the ON position.
Turn the keyswitch to the ON position.
Check the status of the engine fan reverse switch on Cat ET while you operate the switch.
Turn the keyswitch to the OFF position. Expected Result:The status of the switch changes accordingly as you operate the switch.Results:
OK - The status changes accordingly with the switch position. Proceed to Test Step 3.
Not OK - The status does not change with the switch position. Proceed to Test Step 7.Test Step 3. Check for Active Diagnostic Codes
Turn the keyswitch to the ON position.
Use Cat ET to monitor the active diagnostic code screen. Check and record any active diagnostic codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Determine if the problem is related to an open circuit diagnostic code 05 or a short circuit diagnostic code 06.
Turn the keyswitch to the OFF position. Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active.Repair: The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring. If an intermittent electrical problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent problems.STOP
Not OK - An open circuit diagnostic code (05) is active at this time. Proceed to Test Step 5.
Not OK - A short circuit diagnostic code (06) is active at this time. Proceed to Test Step 4.Test Step 4. Create an Open Circuit at the Connector for the Fan Reversing Solenoid
Disconnect the harness connectors for the fan reversing solenoid.
Turn the keyswitch to the ON position.
Access the "Active Diagnostic Code" screen on Cat ET. Check for an active open circuit diagnostic code (05) for the fan reversing solenoid. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Turn the keyswitch to the OFF position. Expected Result:An open circuit diagnostic code