SHAFT AS 3722774 - Caterpillar

Illustration 1 g02358764
Schematic of the transmission downshift switchThis diagnostic code is associated with the transmission downshift switch. The transmission downshift switch is part of the transmission shift assembly. The transmission downshift switch is connected to two inputs of the ECM. One contact is open and the other contact is grounded during proper operation.This FMI 04 means that the ECM has determined that both circuits have been grounded for at least 1 minute.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected.Ensure that the diagnostic code of CID 0621 FMI 04 is active before performing this procedure.Test Step 1. CHECK THE OPERATION OF THE SWITCH IN THE RELEASED POSITION
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the switch harness assembly.
Connect one lead from a multimeter to contact 3 (wire C216-BK) of the switch harness assembly.
Connect the other lead from a multimeter to contact 2 (wire E746-GN) of the switch harness assembly.
Measure the resistance between contact 2 and contact 3. Note the resistance.Expected Result:The resistance from contact 2 to contact 3 is less than 5 ohms.Results:
YES - The resistance from contact 2 to contact 3 is less than 5 ohms, The switch is operating correctly in the released position. Proceed to Test Step 2.
NO - The resistance is not correct. The switch has failed.Repair: Replace the switch.STOPTest Step 2. CHECK THE OPERATION OF THE SWITCH IN THE DEPRESSED POSITION
Depress the switch. Hold the switch in the depressed position.
The machine harness remains disconnected from the switch harness assembly.
Connect one lead from a multimeter to contact 3 (wire C216-BK) of the switch harness assembly.
Connect the other lead from a multimeter to contact 2 (wire E746-GN) of the switch harness assembly.
Measure the resistance between contact 2 and contact 3. Note the resistance.Expected Result:The resistance from contact 2 to contact 3 is greater than 5000 ohms.Results:
YES - The resistance from contact 3 to contact 2 is greater than 5000 ohms. The switch is operating correctly in the depressed position. Proceed to Test Step 3.
NO - The resistance is not correct. The switch has failed.Repair: Replace the switch.STOPTest Step 3. CHECK THE SWITCH CIRCUITS FOR A SHORT TO GROUND
The disconnect switch and the key start switch remains in the OFF position.
The machine harness remains disconnected from the switch harness assembly.
Disconnect the machine harness connector from the Transmission ECM.
At the machine harness connector for the ECM, measure the resistance from contact J1-63 (wire E746-GN) of the machine harness to frame ground.
At the machine harness connector for the ECM, measure the resistance from contact 3 (wire C216-BK) of the machine harness to frame ground.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. The harness is correct. Proceed to Test Step 4.
NO - One or more of the measurements were less than 5000 ohms. There is a short in the machine harness.Repair: The