PLATE-ROPS/FOPS 1196615 - Caterpillar

Illustration 1 g01198790
Schematic of the Primary Steering Pressure SwitchCID 0793 FMI 03 diagnostic code can only be recorded if the optional secondary steering system is installed. The primary steering pressure 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.
Table 1
Primary Steering Pressure Switch    
Switch Position    417-GY Circuit
N/O
J2-37    484-YL Circuit
N/C
J2-38    
Low Pressure     Open     Closed    
High Pressure     Closed     Open    Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code is corrected.Note: Ensure that the diagnostic code indicator is active and that the diagnostic code is active.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 contact A (wire 202-BK) of the machine harness and cab ground.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.