ECD SYSTEM(w/ Glow Plug Controller), Diagnostic DTC:P0046

DTC Code DTC Name
P0046 Turbocharger / Supercharger Boost Control "A" Circuit Range / Performance

DESCRIPTION

The DC motor is used to operate the nozzle vane of the turbocharger. The nozzle vane opens and closes to change the velocity of exhaust gases in order to control the turbo pressure. The ECM varies the duty-cycle of the DC motor in accordance with the driving conditions.

If the nozzle vane is stuck closed (DC motor stuck off), the drivability may deteriorate at wide open throttle. If the nozzle vane is stuck open (DC motor stuck on), the drivability may deteriorate at intermediate throttle or the engine power may be insufficient.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0046 Turbocharger / Supercharger Boost Control "A" Circuit Range / Performance

Condition (A):

Either of following conditions is met

(2 trip detection logic)


  • (a) DC motor duty is 88% or more for 0.5 seconds.

    (MIL is not illuminated)

  • (b) Remains condition (a) for 1 minute or more after 20 second have elapsed since condition (a) detected.

    (MIL is illuminated)

  • (c) When condition (a) is detected 10 times at 20 seconds intervals.

    (MIL is illuminated)

  • (d) Short in DC motor (turbocharger sub-assembly) circuit

    (MIL is illuminated)

Condition (B):

VN turbocharger position does not change smoothly within predetermined time of ignition switch being turned from ON to off (while EFI-MAIN relay is ON) (Determination of a malfunction is conducted within a given time after the ignition switch is turned from ON to off. If a malfunction is detected within this time, DTC is set when the ignition switch is next turned to ON)

(MIL is not illuminated)

(2 trip detection logic)

  • Open or short in DC motor (turbocharger sub-assembly) circuit

  • DC motor (Turbocharger sub-assembly)

  • Nozzle vane position sensor (turbocharger sub-assembly)

  • ECM

Condition (A)-(a):

-

Condition (A)-(b), (c), (d):

Comes on

Condition (B):

-

 DTC stored
DTC Detection Drive Pattern
DTC No. DTC Detection Drive Pattern
P0046

Condition (A):

Both of following condition are met


  • Engine running

  • Depress and release accelerator pedal

    (DC motor varies)

Condition (B):

Ignition switch turned from ON to off
Related Data List
DTC No. Data List
P0046

  • Target Booster Pressure

  • MAP

  • Target VN Turbo Position

  • Actual VN Turbo Position

Tech Tips


  • If DTC P0046 is stored, the following symptoms may appear.


    • Poor acceleration

    • Lack of power due to fail-safe operation

WIRING DIAGRAM

Refer to DTC P0045.

Click here

CAUTION / NOTICE / HINT

Note

When replacing the ECM, perform ECM Initialization and Registration.

Click here

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are 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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0046)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    4. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P0046 is output A
      DTC P0046 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0046 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT TURBOCHARGER SUB-ASSEMBLY


    1. B0041UZC01
      *a Idling to ignition switch off
      *b Ignition switch ON to idling

      Check the motor movement when turning the ignition switch to ON, when starting the engine, and then when turning the ignition switch off.

      OK
      Motor moves smoothly as shown in the illustration.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT TURBOCHARGER SUB-ASSEMBLY (DC MOTOR) Click here

    OK

  3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0046)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off within 10 seconds of clearing DTCs, and wait for 30 seconds.

      Tech Tips

      The ignition switch must be turned off before DTC recurs.

    5. Turn the ignition switch to ON and wait for 10 seconds or more.

    6. Start the engine and fully depress and release the accelerator pedal.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

    8. Read the pending DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC P0046 is output B

    A

    END

    B

    GO TO STEP 6 Click here

  4. INSPECT TURBOCHARGER SUB-ASSEMBLY (DC MOTOR)


    1. Inspect the turbocharger sub-assembly (DC motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 6 Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (DC MOTOR - ECM)


    1. Disconnect the DC motor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B132-2 (M+) - B212-48 (VNM+) Always Below 1 Ω
      B132-1 (M-) - B212-18 (VNM-) Always Below 1 Ω
      B132-2 (M+) or B212-48 (VNM+) - Body ground and other terminals Always 10 kΩ or higher
      B132-1 (M-) or B212-18 (VNM-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  6. REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT

    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0046)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off within 10 seconds of clearing DTCs, and wait for 30 seconds.

      Tech Tips

      The ignition switch must be turned off before DTC recurs.

    5. Turn the ignition switch to ON and wait for 10 seconds or more.

    6. Start the engine and fully depress and release the accelerator pedal.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

    8. Read the pending DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC P0046 is output B

    A

    END

    B

  9. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    4. Turn the ignition switch off within 10 seconds of clearing DTCs, and wait for 30 seconds.

      Tech Tips

      The ignition switch must be turned off before DTC recurs.

    5. Turn the ignition switch to ON and wait for 10 seconds or more.

    6. Start the engine and fully depress and released the accelerator pedal.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

    8. Confirm that the pending DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END