Hino P206D Fault Code: DEF quality sensor – open circuit
22/12/2024
Technical description
The DEF quality sensor is connected via the engine ECU and DCU through CAN communication, and it sends and receives data.
Description of malfunction
Open circuit of DEF quality sensor is received from CAN data
DTC set condition
DTC detection condition:
Starter switch ON
Judgment Criteria:
Failure of DEF quality sensor (flag) is received from CAN data
Reset condition
After having restored to the normal conditions
Indication, warning or system control regulation when the dtc is set
- MIL: OFF
- DEF level indicator is stopped
Symptoms on the vehicle when the dtc is set
Symptoms on the Vehicle Due to Backup Control (Fail Safe Function)
DEF level indicator is OFF
Pre-inspection work
Check that the battery voltage is in the normal range
After-inspection work
- Clear all past DTCs
- Check that no DTC is stored after test drive
Possible causes
DEF quality sensor failure
Inspection procedure
Troubleshooting steps
Step 1: Check the DTC detected (Engine) [Diagnostic Tool]
- Connect the vehicle to the diagnostic tool
- Set the starter switch to the “ON” position
- Select [Engine] and check if a CAN communication system malfunction U02A2 has been detected
Has DTC U02A2 been detected?
| Yes | Go to diagnostic procedure of a related DTC |
| No | Replace the DEF sensor. Clear all past DTCs. Check if no DTC is stored after test drive |
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