DISC-TIMING 3764078 - Caterpillar

Illustration 1 g01456250
Connections of the level switch for the autolube
This diagnostic code is associated with the level switch for the autolube. The switch is connected to two inputs of the ECM. One of the inputs is open and the other input is grounded during proper operation. The FMI 04 means that the ECM has determined that the ECM has determined that the normally open contact and the normally closed contact are grounded.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 1022 FMI 04 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.
Table 1
Status of the Level Switch
Float Position Resistance
FULL 33 Ohms
EMPTY 243 Ohms Note: Check the resistance from contact 1 to contact 2 of the harness for the switch. If the resistance is within the range in Table 1 the switch is operating correctly.Test Step 1. CHECK THE HARNESS OF 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 changed to FMI 03.Results:
OK - The FMI 04 has been changed to FMI 03. The machine harness and the ECM are correct. Proceed to Test Step 4.
NOT OK - The FMI 04 has not changed to FMI 03. Proceed to Test Step 2.Test Step 2. CHECK THE CIRCUITS IN THE HARNESS FOR A SHORT.
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 J1-70 (wire 202-BK(Black)) and J1-22 (wire E985-BR(Brown)) 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 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. 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 J1-70 (wire 202-BK(Black)) and the circuit with the lowest resistance or the short is between J1-22 (wire E985-BR(Brown)) and the circuit with the lowest resistance.Repair: Repair the wiring harness or replace the wiring harness.STOPTest Step 3. CHECK THE SWITCH CIRCUITS IN THE HARNESS FOR AN OPEN.
The machine harness remains disconnected from the ECM and the switch.
At the harness connector for the switch, connect a jumper wire between contact 2 (wire 202-BK(Black)) and