TUBE AS 9J1985 - Caterpillar

This diagnostic code is associated with the Implement Lockout Switch. The switch is connected to two inputs of the Implement ECM. One contact is open and the other contact is grounded during proper operation. This FMI 03 diagnostic code means that the Implement ECM has determined that the normally open contact and the normally closed contact are open.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0490 FMI 03 is active before performing this procedure.System Response:The implements will not work.
Table 1
Switch Continuity
Switch / CID Switch
State Implement ECM
Connector Contact Number Wire Number Status
CID 0490 Implement Lockout Switch Not Locked J1-33 "N/O"(1) E917-WH(White) O(2)
J1-34 "N/C"(3) E918-GN(Green) C(4)
Locked J1-33 "N/O" E917-WH(White) C
J1-34 "N/C" E918-GN(Green) O
(1) Normally Open Position
(2) Open
(3) Normally Closed Position
(4) GroundedTest 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(s) from the ECM.
Measure the resistance between wire 299-BK(Black) of the machine harness for the ECM and contact 2 (wire 299-BK(Black)) at the switch. 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 5.0 ohms. The circuit is open. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT
The machine harness connector(s) remains disconnected from the ECM.
The disconnect switch and the key start switch remain in the OFF position.
Disconnect contact 3 (wire E917-WH(White)) and contact 1 (wire E918-GN(Green)) from the connector of the switch.
At the machine harness connector for the ECM, measure the resistance from contact 3 (wire E917-WH(White)) and contact 1 (wire E918-GN(Green)) of the machine harness to all the contacts that are used in the machine harness connectors for the Implement ECM. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The harness is correct. Proceed to Test Step 3.
NO - One or more of the measurements were less than 5000 ohms. There is a short in the machine harness. Repair: The short is between wire E917-WH(White) and the circuit with the lowest resistance measurement or the short is between wire E918-GN(Green) and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SWITCH CIRCUITS IN THE HARNESS
The machine harness remains disconnected from the ECM and the switch.
At the harness connector for the switch, connect a jumper wire between contact 3 (wire E917-WH(White)) and contact 1 (wire E918-GN(Green)).
At the harness connector for the ECM, measure the resistance from contact J1-33 (wire E917-WH(White)) to contact J1-34 (wire E918-GN(Green)). Expected Result:The resistance is less than 5 ohms. Results:
OK - The resistance is less than 5 ohms. Proceed to Test Step