BUSHING 1320985 - Caterpillar

Illustration 1 g00876084
Schematic for the solenoid valve for the two speedTest Step 1. CHECK FOR A SHORT IN THE WIRE HARNESS
Turn the key start switch to the OFF position.
Remove the floorplate in order to get to the ECM.
Disconnect the wire harness from the ECM.
Measure the resistance from contact 24 (wire P980-OR) to the following contacts of the wiring harness: contact 1, contact 5, contact 42, contact 45 and contact 47.Expected Result:The resistances should be greater than 5000 Ohms.Results:
OK - The resistances were greater than 5000 Ohms. Proceed to Test Step 2.
NOT OK - The resistances were less than 5000 Ohms on one of the readings.Repair: There is a short in the wire harness. Locate the short. Repair the wire harness or replace the wire harness. Stop.Test Step 2. CHECK FOR VOLTAGE ON THE CIRCUIT
Turn the key start switch to the ON position.
Measure the voltage from contact 24 (wire P980-OR) to contact 3 of the wiring harness.Expected Result:The voltage should be near 0 volts.Results:
OK - The voltage is near 0 volts.Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the values that are present on the machine configuration screen match the machine's options. Verify that the values that are present on the machine configuration screen are installed correctly. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the test steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
NOT OK - The voltage is greater than 0 volts.Repair: There is a short in the wire harness. Locate the short. Repair the wire harness or replace the wire harness. Stop.