HARNESS AS-CHASSIS 3375767 - Caterpillar

Illustration 1 g01508853
Schematic for the fan reversing solenoid
Illustration 2 g01508998
A typical view of the P1 connector (harness side) pin locations.
(62) Reversing fan enable Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove the electrical power from the ECM.
Turn the battery disconnect switch to the OFF position.
Thoroughly inspect the J1/P1 ECM connectors. Also, thoroughly inspect all of the other connectors for the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
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 2.
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.Perform a "Wiggle Test" by using the electronic service tool in order to identify intermittent connections.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 2. Check the Voltage At the Relay
Disconnect the relay connector.
Turn the battery disconnect switch to the ON position.
Restore the electrical power to the ECM.
Check the voltage at the relay harness for the following connector pins:
Pin 1
Pin 2
Pin 4
Remove the electrical power from the ECM. Expected Result:The voltage measurement was 24 3 Volts DC.Results:
OK - The voltage measurements were 24 3 Volts DC. Proceed to Test Step 5.
Not OK - The voltage measurement was not 24 3 Volts DC at pin 1 and/or pin 2.Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are completely coupled.Perform a "Wiggle Test" by using the electronic service tool in order to identify intermittent connections.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOP
Not OK - The voltage measurement was not 24 3 Volts DC at pin 4. Proceed to Test Step 3.Test Step 3. Check For Voltage At the Fan Reversing Solenoid
Turn the battery disconnect switch to the OFF position.
Disconnect the harness connectors for the fan reversing solenoid.
Turn the battery disconnect switch to the ON position.
Restore the electrical power to the ECM.
Check for voltage at pin 2 of the