GUIDE-OIL LEVEL GAUGE 8N0897 - Caterpillar

Illustration 1 g03363440
Schematic for the seat speed switch
This diagnostic code is associated with the rotary switch (seat speed). The rotary switch is connected to three inputs of the ECM. Two contacts are open and the other contact is grounded during proper operation.This FMI 03 means that the ECM has determined that the normally open contacts and the normally closed contact are open.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 3431 FMI 03 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:The seat speed will default to LOW speed.
Table 1
Speed Switch Status for Swivel Seat
Switch Position Low (J2-35) Medium (J2-40) High (J2-41)
Low Speed Closed Open Open
Medium Speed Open Closed Open
High Speed Open 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 connector from the switch.
Turn the key start switch and the disconnect switch to the ON position. Expected Result:The CID 3431 FMI 04 has been replaced by CID 3431 FMI 03.Results:
YES - The CID 3431 FMI 04 has been replaced by CID 3431 FMI 03. The machine harness and the ECM are correct. Proceed to Test Step 3.
NO - The CID 3431 FMI 04 is still active. Proceed to Test Step 2.Test Step 2. CHECK THE HARNESS
The machine harness connector remains disconnected from the switch.
The disconnect switch and the key start switch remain in the OFF position.
Disconnect the machine harness connectors from the ECM.
At the machine harness connector for the ECM, measure the resistance from contact J2-35 (wire R860-BU(Blue)), contact J2-40 (wire R861-GN(Green)) and contact J2-41 (wire R862-YL(Yellow)) 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 5 ohms.Results:
YES - Each resistance measurement is greater than 5 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 R860-BU(Blue)) and the circuit with the lowest resistance measurement, (wire R861-GN(Green)) and the circuit with the lowest resistance measurement, and (wire R862-YL(Yellow) and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE OPERATION OF THE SWITCH
The machine harness remains disconnected from the switch.
Rotate the switch to the LOW position.
Connect one lead from a multimeter to contact 1 (wire 202-BK(Black)) of the harness connector for the switch.
Connect the other lead from a multimeter to each of the three contacts of the switch.
Measure the resistance between contact 1 (wire 202-BK(Black)) and each contact of the switch. Note