CAGE 8D4313 - Caterpillar

System Operation Description:The ARD nozzle can become plugged with carbon or with debris. The engine is equipped with a system that cleans the nozzle. The Engine Control Module (ECM) periodically tests the condition of the nozzle. The ARD combustion head contains an electric heating element. The heating element operates periodically in order to clean the nozzle. This test is to verify the correct operation of the ARD nozzle heater electrical circuit.
Table 1
Troubleshooting Test Steps    Values    Results    
1. Check the Device that is Used for Circuit Protection
References will be made to system voltage. The system voltage of a typical 12V system is usually 12V to 16V.
The system voltage of a typical 24V system is usually 24V to 28V.
A. Measure the voltage on the supply side of the device that is used for circuit protection.
B. Measure the voltage on the load side of the device that is used for circuit protection.
   
12V to 16V on a 12V System
or
24V to 28V on a 24V System    
Result: The voltage is equal to system voltage on both sides of the device that is used for circuit protection.
Proceed to Test Step 4.
Result: The voltage is not equal to system voltage on the supply side of the circuit protection device.
Repair: The problem is in the wiring to the battery. Repair the wiring. Proceed to Test Step 11.
Result: The voltage is not equal to system voltage on the load side of the circuit protection device.
Proceed to Test Step 2.
   
Illustration 1 g02958256
Table 2
Troubleshooting Test Steps    Values    Results    
2. Reset the Protection Device
A. Reset the protection device or replace the circuit protection device.
B. Start the engine.
C. Perform the ARD nozzle heater circuit test in Cat ET.
   
Circuit Protection Device or Circuit    
Result: The circuit protection trips.
Proceed to Test Step 3.
Result: The circuit protection does not trip.
There is a problem in the wiring circuit for the ARD heater. Proceed to Test Step 4.
   
3. Check the ARD Head
A. Turn the key to the OFF position
B. Disconnect the connector to the heater at the ARD head.
C. Reset the protection device or replace the circuit protection device.
D. Start the engine.
E. Perform the ARD nozzle heater circuit test in Cat ET.
   
ARD Head    
Result: The circuit protection trips.
There is a problem in the wiring circuit for the ARD heater. Proceed to Test Step 4.
Result: The circuit protection does not trip.
Repair: Replace the ARD head and Proceed to Test Step 11.
   
4. Inspect the Wiring
A. Carefully inspect the wiring for the system. Look for the following problems:
Loose connectors or damaged connectors
Moisture on the connectors or the wiring
Damage that is caused by excessive heat
Damage that is caused by chafing
Improper routing of wiring
Damaged insulation
ARD Head retention clip
   
Wiring    
Result: The wiring was not OK.
Repair: Replace the wiring or repair the wiring. Proceed to Test Step 11.
Result: The wiring was OK.
Proceed to Test Step 5.
   
Illustration 2 g03780878
CEM (typical) (1) Relay for the ARD nozzle heater
Table 3
Troubleshooting Test Steps    Values    Results    
5. Check for