RETAINER 3510301 - Caterpillar

Technician (ET) to perform the "Wiggle Test" on the wires that are associated with the cooling fan.Expected Result:All connectors, pins, and sockets are correctly installed and the harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with 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 correctly coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Check the Status of the Engine Fan Speed with Cat ET
Remove the electrical power from the ECM.
Connect Cat ET to the service tool connector.
Restore the electrical power to the ECM.
Access the "Status Screen" in Cat ET and verify that there is a speed signal displayed.
If a speed signal is displayed, perform the following procedure (if applicable).
In Cat ET, access the "Override Screen" under the "Diagnostics" menu.
Verify that the engine speed is above 400 RPM.
Set the fan speed to 600 rpm in the "Override Screen".Note: If there is no signal for fan speed, the ECM will be running the cooling fan in "Open Loop" mode. In "Open Loop" mode, if 0 rpm is typed into the Override Screen, the ECM will set minimum fan speed. If a figure above 0 rpm is entered, the ECM will set a maximum fan speed. If the fan is in "Open Loop" mode, check the fan speed circuit for faults. If necessary, change the fan speed sensor.Note: Also verify the accuracy of the fan speed at 1200 rpm and 1800 rpm.
Use a 351-8635 Tachometer Kit to determine the actual speed of the fan.
Compare the engine fan speed that is reported by Cat ET to the actual engine fan speed that is reported by the photo-tachometer.
Disable all overrides, and exit the Override Screen.Expected Result:There is a fan speed signal displayed and (if applicable) the actual fan speed is within 50 rpm of the engine fan speed that is reported by Cat ET.Results:
OK - There is a fan speed signal displayed and (if applicable) the actual fan speed is within 50 rpm of the engine fan speed that is reported by Cat ET.Repair: The sensor is operating correctly. There may be an intermittent electrical problem in a connector or in the harness. If an intermittent problem is suspected, refer to service Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - There is not a signal for the fan speed. The engine fan speed is not within the desired rpm range (if applicable). Proceed to Test Step 3.Test Step 3. Check the +10 V Supply Voltage for the Speed Sensor and the Speed Resistor Assembly
Remove the electrical power from the ECM.
Disconnect the connector for the engine cooling fan speed sensor.
Restore the electrical power to the ECM.
Measure the sensor supply voltage for the engine cooling fan speed sensor between terminal 2 (+10V supply) and