91201-881-003 Honda OIL SEAL A (30X42X7) (Honda Code 0498121).

Table 1
Diagnostic Trouble Codes for the Circuit for the Soot Sensor    
J1939 Code    Description    Notes    
4783-3     Diesel Particulate Filter 1 Mean Soot Signal : Voltage Above Normal     The Electronic Control Module (ECM) detects the following conditions:
The signal voltage for the soot sensor is greater than 32 VDC for 60 seconds.
The warning lamp will come on. The ECM will log the diagnostic code.
The ECM will ignore the signal from the soot sensor. The ECM will use the internal soot model to calculate the soot load.    
4783-4     Diesel Particulate Filter 1 Mean Soot Signal : Voltage Below Normal     The Electronic Control Module (ECM) detects the following conditions:
The signal voltage for the soot sensor is less than 9 VDC for 60 seconds.
The warning lamp will come on. The ECM will log the diagnostic code.
The ECM will ignore the signal from the soot sensor. The ECM will use the internal soot model to calculate the soot load.    
4783-9     Diesel Particulate Filter 1 Mean Soot Signal : Abnormal Update Rate     The ECM detects the following conditions:
There is no signal from the soot sensor.
The warning lamp will come on and the ECM will log the diagnostic code.
The ECM will use the last good value for the signal.    
4783-12     Diesel Particulate Filter 1 Mean Soot Signal : Failure     The ECM detects the following conditions:
The soot sensor has failed.
The warning lamp will come on and the ECM will log the diagnostic code.    
4783-13     Diesel Particulate Filter 1 Mean Soot Signal : Calibration Required     The ECM detects the following conditions:
The soot sensor has not been calibrated by the manufacturer.
The warning lamp will come on and the ECM will log the diagnostic code.    
4783-21     Diesel Particulate Filter 1 Mean Soot Signal : Data Drifted Low     The ECM detects the following conditions:
The soot sensor has not received a valid signal from the soot antenna for at least 60 seconds.
The warning lamp will come on and the ECM will log the diagnostic code.    
Table 2
Required Tools    
Tool     Part Number     Part Description     Qty    
A     366-7782     Attenuator     1    The following conditions must exist before any of the preceding codes will become active:
The ECM has been powered for at least 60 seconds.
There are no active 168 codes.The following background information is related to this procedure:The soot sensor is powered from the switched battery voltage. A signal is sent by the soot sensor to one soot antenna. The signal that is received by the other antenna is sent back to the soot sensor. The signal is attenuated by the soot in the Diesel Particulate Filter (DPF). The soot sensor calculates the soot load in the DPF by measuring the attenuation of the signal.
Illustration 1 g02954738
Illustration 2 g02458558
View of the pin locations on the P1 connector for the soot sensor (29) CAN B + (21) CAN B -Test Step 1. Inspect Electrical Connectors And Wiring
Thoroughly inspect the connectors for the soot sensor and the antennas.
Refer to Troubleshooting, "Electrical Connectors - Inspect".
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the connector at the soot sensor that are associated with the active diagnostic code.
Check the screw for the ECM connector for the correct torque of 6 N m (53 lb in).
Check the harness for abrasions and for pinch points from the sensors back to the ECM.
Use the electronic service tool to perform a "Wiggle Test". The "Wiggle Test" will identify intermittent connections.Expected Result:Make sure that all connectors, pins, and sockets are correctly installed. The harness should be free of corrosion, abrasions, and pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are in place and ensure that the connectors are correctly coupled.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 2. Verify All Active Diagnostic Codes
Turn the keyswitch to the ON position. Wait at least 10 seconds for activation of the diagnostic codes.
Download the following items before performing any troubleshooting or clearing any diagnostic codes:
Warranty Report
Aftertreatment Regeneration Trigger History
Product Status Report with Histograms
Verify if any of the diagnostic codes that are listed in Table 1 are active.Results:
Diagnostic code 4783-3 is active. - Proceed to Test Step 3.
Diagnostic code 4783-4 is active. - Proceed to Test Step 4.
Diagnostic code 4783-9 is active. - Proceed to Test Step 5.
Diagnostic code 4783-12 is active. - Proceed to Test Step 6.
Diagnostic code 4783-13 is active. - Proceed to Test Step 7.
Diagnostic code 4783-21 is active. - Proceed to Test Step 8.Test Step 3. Check for a High Voltage at the Soot Sensor
Turn the keyswitch to the ON position.
Measure the voltage across pins 1 and 2 on the soot sensor.
Turn the keyswitch to the OFF position.Expected Result:The voltage is less than 32 VDC.Results:
OK - The supply voltage is within the acceptable range for the soot sensor.STOP
Not OK - The supply voltage is above the acceptable range for the soot sensor.Repair: Investigate the cause of the high voltage. Refer to Systems Operation, Testing and Adjusting, "Charging System - Inspect".STOPTest Step 4. Check for a Low Voltage at the Soot Sensor
Turn the keyswitch to the ON position.
Measure the voltage across pins 1 and 2 on the soot sensor.
Turn the keyswitch to the OFF position.Expected Result:The voltage is more than 9 VDC.Results:
OK - The supply voltage is within the acceptable range for the soot sensor.STOP
Not OK - The supply voltage is below the acceptable range for the soot sensor.Repair: Perform the following procedure:
Make sure that any in-line fuses are intact. Replace any blown fuses.
Check that the supply voltage is adequate. Refer to Systems Operation, Testing and Adjusting, "Charging System - Inspect".
If the supply voltage is satisfactory, inspect the wiring and the connectors. Refer to Troubleshooting, "Ignition