SEAL-U-CUP 3512179 - Caterpillar

Illustration 1 g01445580
Schematic of the Toggle Switch ( Transmission Lockout )This diagnostic code is associated with the Toggle Switch (Transmission Lockout). The switch is connected to two inputs of the ECM. One contact is open and the other contact is grounded during proper operation. Refer to table 1.
Table 1
Status of Transmission Lock Switch    
Transmission Lock Switch    J2-47    J2-44    
Locked     Closed     Open    
Unlocked     Open     Closed    This FMI 03 means that the ECM has determined that the normally open contact 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 0348 FMI 03 is active before performing this procedure.System Response:When this diagnostic code occurs, there is no change in the system operation. The transmission will remain in the last known state, either "locked" or "unlocked".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.
Place the Transmission Lock switch in the UNLOCKED position.
Disconnect the machine harness connector(s) from the ECM.
Measure the resistance between contact J1-70 (wire 202-BK) of the machine harness for the ECM and contact 5 (wire 202-BK) at 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 5000 ohms. The circuit is open. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT
The machine harness connector(s) remains disconnected from the ECM.
The disconnect switch and the key start switch remain in the OFF position.
Disconnect contact 4 (wire T908-BU) and contact 6 (wire T909-YL) from the connector of the switch.
At the machine harness connector for the ECM, measure the resistance from contact 4 (wire T908-BU) and contact 6 (wire T909-YL) 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 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 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 T908-BU and the circuit with the lowest resistance measurement or the short is between wire T909-YL and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness.STOPTest 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 4 (wire 991-WH) and contact 6 (wire 992-PU).
At the harness connector for the ECM, measure the resistance from contact J2-47