ECD SYSTEM (w/ EGR Cooler), Diagnostic DTC:P1264

DTC Code DTC Name
P1264 VN Turbo Controller Malfunction

DESCRIPTION

The turbocharger system is comprised of the Variable Nozzle (VN) type turbocharger, the turbo motor driver and ECM.

The turbocharger has a nozzle vane which opens and closes to control the volume of the exhaust gas flowing into the turbine. This, in turn, controls the boost pressure. When the nozzle vane moves towards the closing direction, the pressure increases. When the vane moves towards the opening direction, the pressure decreases.

The turbocharger actuator built on the turbocharger activates the nozzle vane. The nozzle vane position sensor built on the actuator detects the opening angle of nozzle vane. The turbo motor driver receives an opening angle request from the ECM and a nozzle vane position sensor signal. Based on these signals, the turbo motor driver operates the DC motor and controls the turbocharger's opening angle. The turbo motor driver sends the status as a turbo driver status signal to the ECM

The ECM sends an opening angle request signal to the turbo motor driver to obtain the nozzle vane position for the optimal boost pressure in accordance with the driving conditions.

A01DW5EE02
DTC No. DTC Detection Condition Trouble Area
P1264

When communication error occurs between turbo motor and ECM

(1 trip detection logic)

  • Turbo motor driver

  • Open or short in turbo motor driver circuit

  • Turbo motor driver ground problem

  • ECM

WIRING DIAGRAM

A01DYGUE05

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. INSPECT TURBO MOTOR DRIVER


    1. A01DWW0E04

      Disconnect the T8 turbo motor driver connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the turbo motor driver connector.

      Standard voltage
      Tester Connection Specified Condition
      +B (T8-3) - GND (T8-4) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (TURBO MOTOR DRIVER - ECM)


    1. A01E202E04

      Disconnect the E8 ECM connector.

    2. Disconnect the T8 turbo motor driver connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VNTO (E8-10) - VNTO (T8-7) Below 1 Ω
      VNTI (E8-17) - VNTI (T8-2) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VNTO (E8-10) or VNTO (T8-7) - Body ground 10 kΩ or higher
      VNTI (E8-17) or VNTI (T8-2) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (VNTO VOLTAGE)


    1. A01DVPNE09

      While idling the engine, check the waveform of the ECM connectors using an oscilloscope.

      Standard voltage
      Tester Connection Specified Condition
      VNTO (E8-10) - E1 (E7-7) Correct waveform is as shown

    NG

    REPLACE ECM Click here

    OK

  4. INSPECT TURBO MOTOR DRIVER (VNTI VOLTAGE)


    1. A01DY4GE08

      While idling the engine, check the waveform of the ECM connectors using an oscilloscope.

      Standard voltage
      Tester Connection Specified Condition
      VNTI (E8-17) - E1 (E7-7) Correct waveform is as shown

    NG

    REPLACE TURBO MOTOR DRIVER

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here