TANK AS-RADIATOR-TOP 2W7920 - Caterpillar

Illustration 3 g03766843
ARD combustion head
(4) Port for the heated nozzle
Illustration 4 g03766857
(5) Connector for the heated nozzle
(6) Measurement location on the wire
Table 4
Troubleshooting Test Steps Values Results
7. Check for Voltage at the ARD Head
A. Remove the retaining clip from the ARD nozzle heater.
B. Disconnect the wire to the ARD nozzle heater.
C. Start the engine.
D. Establish communication between Cat ET and the A5:E2 Aftertreatment Controller .
E. Perform the "ARD Nozzle Heater Circuit Test".
F. Check for voltage at the connector for the ARD nozzle heater. Refer to illustration 4 for the proper measurement location.
Power to the A5:E2 Aftertreatment Controller must be OFF before reconnecting the relay.
System voltage is typically 5 VDC of battery voltage.
On industrial engines that use the power converter the system voltage is 24V on the ARD Head.
Equal to System Voltage
Result: The voltage is equal to system voltage.
Proceed to Test Step 8.
Result: The voltage is not equal to system voltage.
Repair: Repair the wiring or replace the wiring between the two-pin connector and the ARD nozzle heater. Proceed to Test Step 12.
8. Check for System Voltage at the A5:E2 Aftertreatment Controller
A. Start the engine.
B. Establish communication between Cat ET and the A5:E2 Aftertreatment Controller.
C. Perform the "ARD Nozzle Heater Circuit Test".
D. Measure the voltage between battery ground and pin 7 at the J1 connector.
Equal to System Voltage
Result: The voltage between battery ground and pin 7 is equal to system voltage.
Repair: Replace the ARD head.
Inspect the coolant supply and return lines to the ARD head for restrictions or blockage.
Proceed to Test Step 12.
Result: The voltage between battery ground and pin 7 is not system voltage.
Repair: Repair the wiring or replace the wiring between the two-pin connector and the A5:E2 Aftertreatment Controller. Proceed to Test Step 12.
9. Check for Output Voltage from the ARD Heater Relay
A. Start the engine.
B. Establish communication between Cat ET and the A5:E2 Aftertreatment Controller .
C. Perform the "ARD Nozzle Heater Circuit Test".
D. Measure the voltage between terminal 2 on the ARD heater relay and battery ground.
Power to the ECM must be OFF before reconnecting the relay.
On industrial engines that use the power converter the system voltage is 24V on the switch