SEAT GP 1859726 - Caterpillar

Illustration 1 g01003600
Schematic of the transmission controlThis diagnostic code is associated with the transmission downshift switch. 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 03 means that the ECM has determined that both contacts 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 0621 FMI 03 is active before performing this procedure.
Table 1
Downshift Switch    
Switch Position    G762-BR Circuit
N/O J1-26    G761-YL Circuit
N/C J1-25    
Depressed     Closed     Open    
Released     Open     Closed    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(s) from the ECM.
Measure the resistance between frame ground (wire 202-BK) of the machine harness and contact 2 (wire 202-BK).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