Hino P2565 Fault Code: Nozzle Position Sensor Failure Range (High Level) (Vnt Actuator Position Sensor Signal Too High)

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:

Position sensor failure. When faulty output value from sensor continues for 1 second.

Reset Condition

After normal operation is restored and the starter switch is on the “LOCK” position.

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 if no DTC is stored after test drive.

Possible Causes

− Faulty contact in VNT actuator (REA) connector.

− Harness disconnection or short-circuit.

− Actuator internal sensor failure.

− Controller internal failure..

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 any DTC other than DTC P2564 or P2565 (for example U010C) has been detected.

NOTE: Due to CAN communication failures, P2564 or P2565 may have been detected

Has a DTC other than DTC P2564 or P2565 (for example U010C) 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 the DTC P2564 or P2565 has been detected.

Has DTC P2564 or P2565 been detected?

Step 3) Check the connector connection [Diagnostic Tool].

1. Set the starter switch to the “LOCK” position.
2. Disconnect the connector connecting the VNT actuator and VNT controller and then securely re-connect it.
3. Set the starter switch to the “ON” position.
4. Select [Engine] and check if the DTC P2564 or P2565 has been detected.

Has DTC P2564 or P2565 been detected?

Step 4) Inspect the VNT actuator harness.

1. Set the starter switch to the “LOCK” position.
2. Disconnect the connector connecting the VNT actuator and VNT controller.
3. Use the electrical tester to measure the resistance from the VNT controller vehicle-side connector to each of the terminals in the VNT actuator vehicle-side connector.

Step 5) Replace the VNT controller [Diagnostic Tool].

1. Set the starter switch to the “LOCK” position.
2. Replace the VNT controller with a new one.
3. Set the starter switch to the “ON” position.
4. Erase the trouble history using the diagnostic tool.
5. Set the starter switch to the “LOCK” position.
6. Set the starter switch to the “ON” position again.
7. Select [Engine] and check if the DTC P2564 or P2565 has been detected.

Has DTC P2564 or P2565 been detected?

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