LINK ASSEM. 1U3776 - Caterpillar

Illustration 1 g01452232
Connections of the quickshift switch
This diagnostic code is associated with the quickshift switch. 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. The FMI 04 means that the ECM has determined that the normally open contact and the normally closed contact are grounded. Before you perform this procedure use table 1 in order to determine the connector and the contacts that correspond to the circuit.Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all of the connections in the circuit are clean and secure. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0628 FMI 04 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.
Table 1
Status of the Quickshift Switch
Quickshift Switch Wire G758-PU(Purple)
J1-63 G759-WH(White)
J1-64
OFF Closed Open
ON Open Closed Test Step 1. CHECK THE SWITCH
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the switch.
Turn the key start switch and the disconnect switch to the ON position. Expected Result:The FMI 04 has been replaced by FMI 03.Results:
OK - The FMI 04 has been replaced by FMI 03. The machine harness and the ECM are correct. Proceed to Test Step 3.
NOT OK - The FMI 04 is still active. Proceed to Test Step 2.Test Step 2. CHECK THE HARNESS
Turn the disconnect switch and the key start switch to the OFF position.
The machine harness remains disconnected from the switch.
Disconnect the machine harness connector(s) from the ECM.
Measure the resistance between contacts J1-64 (wire G759-WH(White)) and J1-63 (wire G758-PU(Purple)) of the machine harness to all the contacts that are used in machine harness connectors for the ECM. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. The circuits are correct. Proceed to Test Step 3.
NO - One or more of the resistance measurements are less than 5 ohms. The harness has failed. The short is between J1-64 (wire G759-WH(White)) and the circuit with the lowest resistance or the short is between J1-63 (wire G758-PU(Purple)) and the circuit with the lowest resistance. Repair: Repair the wiring harness or replace the wiring harness.STOPTest Step 3. CHECK THE OPERATION OF THE SWITCH
The machine harness remains disconnected from the switch.
Connect one lead from a multimeter to contact 2 (wire 202-BK(Black)) of the harness connector for the switch.
Connect the other lead from a multimeter to contact 1 (wire G758-PU(Purple)) of the harness connector for the switch.
Measure the resistance between contact 2 (wire 202-BK(Black)) and