CONTROL GP-AUTOSHIFT 1266648 - Caterpillar

Illustration 1 g00739370
Schematic of the switch circuit for the parking brakeTest Step 1. CHECK FOR PROPER OPERATION
Occupy the seat.
Place the armrest in the DOWN position.
Turn the key start switch to the ON position.
Press and release the parking brake switch.Expected Result:The parking brake indicator should be off and the auxiliary hydraulics should be enabled.Results:
OK - The parking brake indicator is off and the auxiliary hydraulics are enabled.Repair: There is no problem at this time. Stop.
OK - The parking brake indicator is off and the auxiliary hydraulics are not enabled. Proceed to Test Step 2.
NOT OK - The parking brake indicator is on.Repair: See Troubleshooting, RENR2864, "Switch (Parking Brake)". Stop.
NOT OK - The parking brake indicator is on and the armrest indicator is flashing.Repair: See Troubleshooting, RENR2864, "Armrest Indicator Is Flashing". Stop.
NOT OK - The parking brake indicator is flashing.Repair: The parking brake indicator is not working properly. See Troubleshooting, RENR2864, "Parking Brake Indicator Is Flashing". Stop.Test Step 2. CHECK THE STATUS OF THE SWITCH
Press and hold the parking brake switch.
Observe the status on the Caterpillar ET.
Release the switch.
Observe the status on the Caterpillar ET.Expected Result:The switch status should have changed from the "CLOSED" status to the "OPEN" status.Results:
OK - The status of the switch changed from the "CLOSED" status to the "OPEN" status.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 switch status did not change from the "CLOSED" status to the "OPEN" status. Proceed to Test Step 3.Test Step 3. CHECK THE SWITCH CIRCUIT
Remove the floorplate in order to get to the ECM.
Remove the wire harness from the ECM.
Press and hold the switch.
Measure the resistance from contact 3 to contact 45 of the wire harness connector.Expected Result:The resistance should be less than 5 Ohms.Results:
OK - The resistance is less than 5 Ohms.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 resistance is greater than 5 Ohms.Repair: The circuit is open in the wire harness and/or the connector between the interlock ECM and the