Hino P22D3 Fault Code: Nozzle stuck (VNT stick failure)

TECHNICAL DESCRIPTION 

• The VNT actuator stepless operates the nozzle via the REA (Rotary Electric Actuator) and controls turbine speed and boost pressure. 
• The VNT actuator (REA) has a position sensor and constantly monitors the target opening and the actual opening. 
• Wiping operation is carried out when the engine is stopped and the soot, oil, and other impurities accumulated in the vane working range are removed. Also, the turbocharger mechanical working range is checked for trouble.

DTC SET CONDITION

DTC Detection Condition:

• While the engine is in operation: Always.
• While the engine is stopped: During wiping operation.

Judgment Criteria:

Stuck nozzle (position control failure): When motor drive load is 95% or more for 3 seconds continuously and restoration operation fails 5 times.

RESET CONDITION

After normal operation is restored and the starter switch is turned OFF.

INDICATION, WARNING OR SYSTEM CONTROL REGULATION WHEN THE DTC IS SET

• MIL: ON
• SVS light: OFF
• Engine output is restricted.
• Cruise control function is not available.
• Auxiliary brake function is not available.

SYMPTOMS ON THE VEHICLE WHEN THE DTC IS SET

Symptoms on the Vehicle Due to Backup Control (Fail Safe Function):

• Engine output is insufficient.
• Cruise control does not work.
• Auxiliary brake does not work.

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 detected after test drive.

POSSIBLE CAUSES

• Stuck nozzle. 
• Stuck external link.

INSPECTION PROCEDURE

TROUBLESHOOTING STEPS

Step 1) Check the DTC detected 1 (Engine ECU) [Diagnostic Tool].

1. Connect the vehicle to the diagnostic tool.
2. Set the starter switch to the “ON” position.
3. Select [Engine] and check if P22D3 (for example, U010C) has been detected.

Has a DTC other than P22D3 been detected?

Step 2) Check the DTC detected 2 (Engine ECU) [Diagnostic Tool].

1. Set the starter switch to the “ON” position.
2. Select [Engine] and check if P22D3 has been detected.

Has a DTC P22D3 been detected?

Step 3) Inspect the operation of the VNT controller [Diagnostic Tool].

Select [Inspection Menu] from the menu, then inspect the response delay at the Target VNT position and Actual VNT position. 

CAUTION: Perform the inspection while the engine is stopped to avoid damages. 

Inspection Procedure:

1. Select [Inspection Menu].
2. Select [VNT inspection].
3. Click [Start inspection].
4. Select [VNT UP]: 
   • Inspect the response delay at each step of the Target VNT position and Actual VNT position from 0 to 90%. 
5. Select [VNT DOWN]:
   • Inspect the response delay at each step of the Target VNT position and Actual VNT position from 90 to 0%.

NOTE: The VNT opening position changes of around 10% per step between 0 – 90%.

Do the measurements meet the standard value?

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