COOLER AS-OIL 4193606 - Caterpillar

AUTO Retarder On/Off switch is connected to the ARC by two inputs. The inputs are on and off. One input is open and the other input is grounded during proper operation. This diagnostic code is detected when the status of the "on" input is identical to the status of the "off" input for the AUTO Retarder ON/OFF switch.This diagnostic code is recorded when the ARC reads the "on" circuit and the "off" circuit as being grounded.
The "on" circuit connects to connector A-A11 (wire D985-BR-16).
The "off" circuit connects to connector A-A26 (wire D986-PK-16).Note: Ensure that the CID 0713 FMI 04 diagnostic code is present and/or active.Note: The following procedure can create other related diagnostic codes. The ARC detects these related diagnostic codes.
CHECK THE SWITCH.
Ensure that the CID 0713 FMI F04 is present and/or active.
Disconnect wire 202-BK-16 from the switch.Expected Result: The diagnostic code remains active.Results:
OK: The diagnostic code remains active. The switch is NOT the cause of the diagnostic code. Proceed to Step 2.
NO: The diagnostic code is NO longer active. The switch is failed. Repeat the test "CHECK THE SWITCH" in order to verify that the switch has failed. Replace the switch. STOP.
CHECK THE "N/C" WIRE FOR A SHORT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the A machine harness connector from the ARC.
Place the "On/Off" switch in the "Off" position.
Measure the resistance between contact A-A11 (wire D985-BR-16) and the frame ground.Expected Result: The resistance is greater than 5000 ohms.Results:
OK: The resistance is greater than 5000 ohms. The "On" circuit of the harness is correct. Proceed to Step 3.
NO:The resistance is less than 5000 ohms. The machine harness has failed. The "On" wire (D985-BR-16) of the harness circuit is shorted. The short is between the ARC and the switch. Repair the machine harness or replace the machine harness. STOP.
CHECK THE "N/O" WIRE FOR A SHORT.
The condition of the previous test remain intact.
Measure the resistance between contact A-A26 (wire D986-PK-16) and frame ground.Expected Result: The resistance is greater than 5000 ohms.Results:
OK: The resistance is greater than 5000 ohms. The "Off" wire (D986-PK-16) of the harness circuit is correct. It is unlikely that the ARC is faulty. Exit this procedure and perform a check of the CID and the FMI again. Replace the ARC if the cause of the diagnostic code is NOT found. See Testing And Adjusting, "ARC - Replace". STOP.
NO: The resistance is less than 5000 ohms for one or more circuits. The circuit in the machine harness is shorted. The "Off" wire (D986-PK-16) in the harness circuit is shorted to ground within the machine harness. The short is between contact A-A26 and frame ground. Repair the machine harness or replace the machine harness. STOP.