0398068 JOHNSON FLOAT CHAMBER

Table 1
Diagnostic Codes Table
J1939 Code CDL Code Code Description Comments
1761-2 3130-2 Aftertreatment #1 Diesel Exhaust Fluid Tank Level: Erratic Intermittent or Incorrect The ECM detects that the DEF Level measurement received from the DEF Tank Sensor is not within the acceptable range.
or
The DEF Level measurement received from the DEF Tank Sensor has shown an invalid drop in level measurement within a monitoring window.
The code is logged if the DEF level measurement does not resolve into acceptable measurement range after a time delay.
1761-12 3130-12 Aftertreatment 1 Diesel Exhaust Fluid Tank Level : Failure The ECM detects a failure of the level sensor.
The code is logged.
3031-12 3134-12 Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature : Failure The ECM detects a failure of the temperature sensor.
The code is logged.
3516-2
(Only 2017- Engines / Engines with DQS Enabled) 3100-2
(Only 2017- Engines / Engines with DQS Enabled) Aftertreatment #1 DEF Concentration : Erratic, Intermittent, or Incorrect
(Only 2017- Engines / Engines with DQS Enabled) The ECM detects that the DEF Quality measurement received from the DEF Tank Sensor over the datalink is not within the acceptable range.
or
The DEF Quality measurement received from the DEF Tank Sensor has shown an invalid quality measurement within a monitoring window.
The code is logged if the DEF quality measurement does not resolve into acceptable measurement range after a time delay.
3516-12 3100-12 Aftertreatment #1 DEF Concentration : Failure The ECM detects a failure of the quality sensor.
The code is logged. Battery voltage is routed to terminal 4 of the tank header unit. The return is routed to terminal 3 of the tank header unit. The temperature and level signals are routed through the CAN C data link on terminal 2 (CAN C+) and terminal 1 (CAN C-). The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.
Illustration 1 g06439743
Schematic for the DEF tank header unit
Illustration 2 g03700612
(1) DEF tank header electrical connector
(2) DEF tank headerIf possible, the machine should be on a level surface before the following procedure is performed.The tank header unit houses the DEF tank temperature and the DEF tank level sensors. From 2017 onwards, the tank header unit also houses a DEF quality sensor. The sensors are not serviceable individually.Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Codes
A. Establish communication between the electronic service tool and the Diesel Exhaust Fluid Controller (DCU) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Turn the keyswitch to the ON position.
C. Look for active or logged codes.
Diagnostic code
Result: A -12 diagnostic code is active.
Proceed to Test Step 2.
Result: A 1761-2 (3130-2) code is active.
Proceed to Test Step 4.
Result: A 3516-2 (3100-2) code is active.
Proceed to Test Step 5.
2. Check for Battery Voltage at the DEF Tank Header
A. Disconnect the harness at the DEF tank header.
B. Turn the keyswitch to the ON position.
C. Measure the voltage between terminals 3 and 4.
D. Turn the keyswitch to the OFF position.
Battery voltage
Result: The measured voltage is less than 9.5V during cranking.
Repair: Investigate the cause of the incorrect voltage. Refer to Troubleshooting, "Electrical Power Supply - Test".
Result: The measured voltage is greater than 9.5V during cranking.
Proceed to Test Step 3.
3. Ensure that the Application is on a Level Gradient
A. If necessary, move the application to a level gradient.
B. Wait at least 2 minutes. Turn the keyswitch to the ON position.
C. Connect to the electronic service tool.
D. Use the electronic service tool to check the DEF level measurement.
Note: Use the electronic service tool for this step and not a gauge on the application.
DEF Level
Result: The DEF level indicates a value between 0 percent and 100 percent.
Return the engine to service.
Result: The DEF level indicates "Conditions Not Met" 2 minutes after the application has been moved to a level gradient.
Proceed to Test Step 4.
4. Flush the DEF Tank and Refill the DEF Tank
A. Turn the keyswitch to the OFF and ensure that the "Wait to Disconnect" lamp has switched off.
B. Flush the DEF tank and refill the DEF tank. Refer to Operation and Maintenance Manual, "Diesel Exhaust Fluid - Flush" for the correct procedure.
Note: Only use DEF that meets ISO 22241 standards.
C. Turn the keyswitch to the ON position.
D. Use the electronic service tool to check the DEF level measurement.
Note: Use the electronic service tool for this step and not a gauge on the application.
DEF Level
Result: The DEF level indicates a value between 0 percent and 100 percent 2 minutes after the DEF tank has been filled.
Return the engine to service.
Result: The DEF level indicates "Conditions Not Met" 2 minutes after the DEF tank has been filled.
Proceed to Test Step 5.
5. Repair the DEF Tank Header
A. Repair the DEF Tank header sensor with the DEF Manifold Sensor Kit. Refer to Disassembly and Assembly, Manifold (DEF Heater) Sensor - Disassemble (Temperature, Level, Quality DEF Manifold Sensor) and Manifold (DEF Heater) Sensor -Assemble (Temperature, Level, Quality DEF Manifold Sensor).
DEF Tank Header
Result: The fault is eliminated.
Return the unit to service.
Result: The fault is still present.
Contact the Dealer Solutions Network (DSN).