0384713 JOHNSON GEARCASE ASSEMBLY

On some industrial engine applications, the engine may be fitted with a power converter. This device allows a 24V Clean Emissions Module (CEM) to be installed on a 12V engine. If this component fails, the A5:E2 Aftertreatment Controller may log codes related to the ARD nozzle heater.
Table 1
J1939 Code and Description CDL Code and Description Comments
4301-3
Aftertreatment #1 Fuel Injector #1 Heater Control : Voltage Above Normal 3182-3
Aftertreatment #1 Fuel Injector #1 Heater Control : Voltage Above Normal High voltage or an open circuit has been detected in the ARD nozzle heater circuit
4301-4
Aftertreatment #1 Fuel Injector #1 Heater Control : Voltage Below Normal 3182-4
Aftertreatment #1 Fuel Injector #1 Heater Control : Voltage Below Normal Low voltage or a short circuit has been detected in the ARD nozzle heater circuit.
Illustration 1 g03546257
Table 2
Troubleshooting Test Steps Values Results
1. Check the Device that is Used for Circuit Protection
A. Measure the voltage on the supply side of the device that is used for circuit protection. Refer to the application-specific schematic for the location of the circuit protection device.
B. Measure the voltage on the load side of the device that is used for circuit protection.
Note: On industrial engines, refer to the appropriate schematic to determine if a power converter is installed. On these systems the device used for circuit protection is on the 12V side.
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.
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.
Proceed to Test Step 12.
3. Check the ARD Head
A. Turn the key to OFF.
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.
Inspect the coolant supply and return lines to the ARD head for restrictions or blockage.
Proceed to Test Step 11.
4. Check for Output Voltage from the ARD Heater Relay
Note: The keyswitch should be turned to ON, but the nozzle heater turned off for this step.
A. Turn the keyswitch to ON. Do not start the engine.
B. Measure the voltage between terminal 2 and a good ground source.
Note: On industrial engines that use the power converter, the system voltage is 24V on the switch side of the relay.
Equal to System Voltage
Result: The voltage between terminal 2 on the ARD heater relay and a good ground is not equal to system voltage.
Proceed to Test Step 5.
Result: The voltage between terminal 2 on the ARD heater relay and a good ground is equal to system voltage.
Repair: The ARD heater relay is not operating properly. Replace the ARD heater relay. Proceed to Test Step 12.
5. Check for System Voltage at the ARD Heater Relay
A. Turn the keyswitch to "ON".
B. Measure the voltage between terminal 3 and terminal 4 on the ARD heater relay.
On industrial engines that use the power converter, the system voltage is 24V on the switch side of the relay.
Equal to System Voltage
Result: The voltage between terminal 3 and terminal 4 on the ARD heater relay is equal to system voltage.
Proceed to Test Step 6.
Result: The voltage between terminal 3 and terminal 4 on the ARD heater relay is not equal to system voltage.
Repair: The problem is between terminal 3 on the ARD heater relay and the circuit protection device or the problem is that terminal 4 does not have a good ground source. Repair the problem. Proceed to Test Step 12.
Illustration 2 g03766836
CEM (typical)
(1) Two-pin ARD heater wire connector
(2) ARD Nozzle heater relay
(3) ARD head
Table 3
Troubleshooting Test Steps Values Results
6. Check for System Voltage at the Two-Pin ARD Heater Wire Connector
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 terminal 1 on the two-pin ARD heater wire connector.
Equal to System Voltage
Result: The voltage between battery ground and terminal 1 is equal to system voltage.
Proceed to Test Step 7.
Result: The voltage between battery ground and terminal 1 is not system voltage.
Proceed to Test Step 9.
Illustration 3 g03766843
ARD combustion head
(4) Port for the heated nozzle
Illustration 4