AIR CONDITIONER AR 3A7163 - Caterpillar

Illustration 1 g03706842
Schematic of the limit switch (STIC lockout control)
This diagnostic code is associated with the limit switch (STIC lockout control). 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.
Table 1
Limit Switch (STIC Lockout Control)
Switch Position N/C(1)
J1-33 N/O(2)
J1-34
Locked Closed Open
Unlocked Open Closed
(1) N/C means Normally Closed.
(2) N/O means Normally Open.This FMI 03 means that the 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 0626 FMI 03 is active before performing this procedure.System Response:When this diagnostic code occurs, there is no change in the system operation.Test 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 connectors from the ECM.
Measure the resistance between the frame ground of the machine harness and contact 2 (wire 202-BK(Black)) at the switch. Expected Result:The resistance is less than 5 ohms. Results:
YES - The resistance is less than 5 ohms. The circuit is correct. Proceed to Test Step 2.
NO - The resistance is greater than 5 ohms. The circuit is open. The