23173-ZY3-000 Honda RUBBER, MOUNT CASE SEAL (Honda Code 6991145).

Table 1
Diagnostic Codes Table
J1939 Code Code Description Comments
1761-2 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 Aftertreatment 1 Diesel Exhaust Fluid Tank Level : Failure The ECM detects a failure of the level sensor.
The code is logged.
3031-12 Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature : Failure The ECM detects a failure of the temperature sensor.
The code is logged.
3516-2 Aftertreatment #1 DEF Concentration : Erratic, Intermittent, or Incorrect 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 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, level, and quality 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 g06409969
Schematic for the DEF tank header unit
Note: All connectors may not be shown. Refer to the Electrical Schematic for the application for details of any connectors between the DEF reversing valve relay connector and the ECM connector.
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, the DEF tank level, and the DEF quality sensors. 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 ECM . 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 code is active.
Proceed to Test Step 4.
Result: A 3516-2 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 on the harness connector for the DEF tank header.
D. Turn the keyswitch to the OFF position.
Battery voltage
Result: The measured voltage is not equal to battery voltage. The fault is in the power supply wiring to the DEF tank header.
Repair: Repair the faulty wiring or replace the faulty wiring.
Result: The measured voltage is equal to battery voltage.
Proceed to Test Step 3.
3. Connect a Replacement DEF Tank Header Unit
A. Disconnect the connector from the DEF tank header unit.
B. Connect a replacement DEF tank header unit to the harness. Do not install the unit.
C. Connect the electronic service tool.
D. Turn the keyswitch to the ON position. Wait for at least 2 minutes.
E. Check for -12 codes.
DEF tank header replacement
Result: No -12 diagnostic codes are active.
Repair: Install the replacement DEF tank header unit.
Confirm that the fault has been eliminated.
Result: A -12 diagnostic code is active.
Reconnect the harness connector to the original DEF tank header unit.
Contact the Dealer Solutions Network (DSN).
4. 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 5.
5. 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 Tank - 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 6.
6. Inspect the DEF Tank Header
A. Turn the keyswitch to the OFF position.
B. Remove tank header (2) from the DEF tank. Refer to Disassembly and Assembly, "Manifold (DEF Heater) - Remove and Install".
C. Inspect the DEF tank header for damage or debris to the sensor pick-up tube.
Correct operation of level and quality sensors
Result: The level sensor is damaged or debris is present.
Repair: Turn the keyswitch to the ON position. Wait for 2 minutes. If the DEF level in the electronic service tool indicates "Conditions Not Met", replace the DEF tank header.
Result: The DEF temperature is greater than 0° C (32° F) and the 3516-2 code is still active.
Repair: Replace the DEF tank header.
If the fault is still present, contact the Dealer Solutions Network (DSN).