PIN AS 3336654 - Caterpillar

Illustration 1 g00438565
Transmission Direction Switch SchematicThe transmission direction switch has three inputs to the power train electronic control module (ECM). During normal operation, two of the inputs are open and the other input is grounded. CID 0623 FMI 03 service code is detected when all of the inputs are either open or shorted to the +battery. Before performing this procedure use table 1 in order to determine the connector and the contacts that corresponds to the faulty circuit.
Table 1
Direction Switch Status    
Switch Position    G755-GY Circuit
R Switch
J1-14    G763-PU Circuit
N Switch
J1-13    G750-BU Circuit
F Switch
J1-30    
R     Closed     Open     Open    
N     Open     Closed     Open    
F     Open     Open     Closed    Note: Ensure that the desired fault CID 0623 FMI 03 is active.Note: The following procedure can create other faults that the power train ECM detects. Ignore these created faults and clear the created faults when CID 0623 FMI 03 is corrected.
Check for an open circuit.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness connector J1 from the power train ECM.
At the machine harness connector for the power train ECM, check the continuity to ground of the switch contacts with the transmission direction switch activated and not activated. Refer to table 1 for the correct transmission direction switch status.Expected Result: The continuity check does NOT agree with table 1.Results:
YES - The continuity check does NOT agree with table 1. The harness or the transmission direction switch is faulty. Proceed to Step 2.
NO - The continuity check agrees with table 1. Proceed to Step 3.
Check the transmission directon switch.
Disconnect the machine harness from the transmission directon switch.
Check the continuity to ground of the switch contacts with the transmission directon switch activated and not activated. Refer to table 1 for the correct transmission direction switch status.Expected Result: The continuity check does NOT agree with table 1.Results:
YES - The continuity check does NOT agree with table 1. The transmission directon switch is faulty. Repair the switch or replace the switch. STOP.
NO - Continuity check agrees with table 1. Repair the machine harness or replace the machine harness. STOP.
Check for a short to the +battery.
At the machine harness connector J1 for the power train ECM, check the continuity from each of the switch contact wires to the contacts J1-1, J1-6, J1-40 and J2-12.Expected Result: Continuity exists between one of the sources of the battery voltage and the switch circuit.Results:
YES - Continuity exists between one of the sources of battery voltage. The machine harness is faulty. Repair the machine harness or replace the machine harness. STOP.
NO - Continuity does not exist between one of the sources of battery voltage and the switch circuit. The machine harness is correct. It is unlikely that an power train ECM is faulty. Exit this procedure and perform CID 0623 FMI 03. If the cause is not found, replace the power train ECM. Refer to Testing and Adjusting, "Electronic Control Module (Power