- Verify that the engine is off.
Illustration 1 g03099577
(1) ARD combustion head
(2) ARD Nozzle Heater Wire
Illustration 2 g03099598
Measuring the current flow
(1) ARD combustion head
(2) ARD Nozzle Heater Wire
(3) Clamp-on ammeter
- Connect the clamp on 225-8266 Ammeter Tool Gp (3) around the ARD nozzle heater wire (2) on the ARD combustion head (1) . Make sure that the jaws of the ammeter are away from the metal part of electrical connector . Refer to Systems Operation/Testing and Adjusting, “Charging System – Test” for information about the ammeter.
- Establish communication between Caterpillar Electronic Technician and the ECM. Refer to Troubleshooting, “Electronic Service Tools” for the proper procedure.
- Start the engine. Activate the “ARD Nozzle Heater Circuit Test” under the “Diagnostic Tests” menu in Cat ET. The circuit test will run for 3 minutes and can be stopped at any time.
- Observe the current reading on the ammeter.
- Disable the circuit test. Stop the engine. Remove the clamp-on ammeter.
- Disconnect Cat ET.