STARTING MOTOR 0653729 - Caterpillar

Illustration 1 g01049732
Schematic for the rotary switch (autoshift control)This diagnostic code is associated with the rotary switch (autoshift control). The rotary switch is connected to four inputs of the ECM. Three contacts are open and the other contact is grounded during proper operation.This FMI 03 means that the ECM has determined that the normally open contacts and the normally closed contact are open.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0368 FMI 03 is active before performing this procedure.
Table 1
Autoshift Control Switch Status for STIC Steering    
Switch Position     Manual 2 (J1-29)     Auto 3 (J1-31)     Auto 4 (J1-32)     Auto 5 (J1-33)    
AUTO Speed 2     Open     Open     Open     Closed    
AUTO Speed 3     Open     Open     Closed     Open    
AUTO Speed 4     Open     Closed     Open     Open    
Manual     Closed     Open     Open     Open    Test Step 1. CHECK THE GROUND CIRCUIT OF THE SWITCH IN THE HARNESS
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the switch.
Measure the resistance between frame ground and contact 1 (wire 202-BK) of the switch.Expected Result:The resistance is less than 5 ohms.Results:
OK - The resistance is less than 5 ohms. The circuit is correct. Proceed to Test Step 2.
NOT OK - The resistance is greater than 5 ohms. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness. Stop.Test Step 2. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT
The machine harness connector remains disconnected from the switch.
The disconnect switch and the key start switch remain in the OFF position.
Disconnect the machine harness connector(s) from the ECM.
At the machine harness connector for the ECM, measure the resistance from contact J1-29 (wire 973-BR), contact J1-31 (wire 977-YL), contact J1-32 (wire H728-GN), and contact J1-33 (wire H729-WH) of the machine harness to all the contacts that are used in the machine harness connectors for the ECM.Expected Result:Each resistance measurement is greater than 5 ohms.Results:
OK - Each resistance measurement is greater than 5 ohms. The harness is correct. Proceed to Test Step 3.
NO - One or more of the measurements were less than 5 ohms. There is a short in the machine harness.Repair: The short is between wire 973-BR and the circuit with the lowest resistance measurement, wire 977-YL and the circuit with the lowest resistance measurement, wire H728-GN and the circuit with the lowest resistance measurement, or the short is between wire H729-WH and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness. Stop.Test Step 3. CHECK THE SWITCH CIRCUITS IN THE HARNESS
The machine harness remains disconnected from the ECM and the switch.
At the harness connector for the switch, connect a jumper wire between contact 5