TRANSMISSION AR 4908822 - Caterpillar

one of the jumper wires into this terminal location.
Connect the J1/P1 ECM connector.
Short the jumper wires in terminals P1-25 (starting aid switch) and P1-29 (return).
Restore electrical power to the ECM.
Observe the results on the "Status" screen of Cat ET.
Remove electrical power from the ECM.
Remove the jumper wires.Expected Result:When the wires are shorted, Cat ET displays the status of the starting aid switch as "On".When the wires are not shorted, Cat ET displays the status of the starting aid switch as "Off".Results:
OK - The ECM is reading the switch input properly. There may be a problem in the wiring between the switch and the ECM. Proceed to Test Step 5.
Not OK - The ECM is not reading the switch input properly.Repair: Replace the ECM. Refer to Troubleshooting, "ECM - Replace" before replacing the ECM.Verify that the repair eliminates the problem.STOPTest Step 5. Check the Wiring Harness from the Starting Aid Switch to the ECM
Verify that the electrical power is removed from the ECM.
Disconnect the J1/P1 ECM connector.
Short the wires from the starting aid switch on the J1/P1 connector.
Disconnect the connector for the starting aid switch.
Measure the resistance between the terminals at the starting aid switch.
Return the wiring to the original configuration.Expected Result:The resistance does not indicate an open circuit.Results:
OK - The resistance does not indicate an open