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ECD SYSTEM (w/o DPF), Diagnostic DTC:P0046, P0047, P0048

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DTC Code DTC Name
P0046 Turbocharger / Supercharger Boost Control Solenoid Circuit Range / Performance
P0047 Turbocharger/Supercharger Boost Control "A" Circuit Low
P0048 Turbocharger/Supercharger Boost Control "A" Circuit High
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DESCRIPTION

These DTCs indicate that the DC motor of the turbocharger is malfunctioning. The ECM monitors the DC motor current to detect an open or short in the DC motor circuit. If the current meets certain criteria, the ECM stores a DTC and illuminates the MIL immediately.

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 emissions in order to control the turbo pressure. The ECM varies the duty ratio of the DC motor in accordance with the driving conditions.

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

Table 1. P0046
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds

Either condition is met when the motor is operating (1 trip detection logic):


  • DC motor duty ratio is +/-100% for 1.3 seconds or more.

  • DC motor current is 2.2 A or higher for 5 seconds or more.

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

  • DC motor (turbocharger sub-assembly)

  • Turbocharger nozzle vane is stuck or movement is irregular
Table 2. P0047
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
2 seconds after engine is started, race engine for 1 second

Both conditions are met for 1 second or more when the motor is operating (1 trip detection logic):


  • DC motor duty ratio is 100%.

  • DC motor current is 0.5 A or less.

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

  • DC motor (turbocharger sub-assembly)

  • Turbocharger nozzle vane is stuck or movement is irregular
Table 3. P0048
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
2 seconds after engine is started, race engine for 1 second Overcurrent is detected 25 times or more (1 trip detection logic).

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

  • DC motor (turbocharger sub-assembly)

  • Turbocharger nozzle vane is stuck or movement is irregular
Tip:

  • If DTC P0046, P0047 and/or P0048 is stored due to the nozzle vane being stuck closed, the following symptom may appear:


    • Vehicle surge when driving with full load

  • If DTC P0046, P0047 and/or P0048 is stored due to the nozzle vane being stuck open, the following symptoms may appear:


    • Lack of power

    • Vehicle surge or hesitation under light or medium load

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

Read freeze frame data using the intelligent tester. 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.

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PROCEDURE


  1. Click here

    CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0046, P0047 AND/OR P0048)


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Read the DTCs.

      Table 4. Result
      Result Proceed to
      P0046, P0047 and/or P0048 is output A
      P0046, P0047 and/or P0048 and other DTCs are output B
      Tip:

      If codes other than P0046, P0047 and/or P0048 are output, perform troubleshooting for those DTCs first.


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    INSPECT TURBOCHARGER SUB-ASSEMBLY (DC MOTOR OPERATION)


    1. Inspect the turbocharger sub-assembly (Click here).


  3. Click here

    INSPECT TURBOCHARGER SUB-ASSEMBLY (DC MOTOR RESISTANCE)


    1. A01DPG1E02

      Disconnect the DC motor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (M-) - 2 (M+) Always 1 to 100 Ω
      Table 5. Text in Illustration
      *a

      Component without harness connected

      (DC Motor)

    3. Reconnect the DC motor connector.


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    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 (Check for Open)
      Tester Connection Condition Specified Condition
      C75-1 (M-) - C93-7 (M-) Always Below 1 Ω
      C75-2 (M+) - C93-6 (M+) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C75-1 (M-) or C93-7 (M-) - Body ground Always 10 kΩ or higher
      C75-2 (M+) or C93-6 (M+) - Body ground Always 10 kΩ or higher

    4. Reconnect the DC motor connector.

    5. Reconnect the ECM connector.


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    REPLACE ECM


    1. Replace the ECM (Click here).


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    REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly (Click here).


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    REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


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    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON for 5 seconds or more.

    5. Enter the following menus: Powertrain / Engine / DTC.

    6. Confirm that the DTC is not output again.


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    END

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    CHECK FOR INTERMITTENT PROBLEMS

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    GO TO DTC CHARTClick here