DTC    P0234/34    Turbocharger / Supercharger Overboost Condition

DTC    P0299/34    Turbocharger / Supercharger Underboost

DTC    P1251/34    Step Motor for Turbocharger Control Circuit (Intermittent)

for Preparation Click here


DESCRIPTION

HINT:
*: Only for 1KD-FTV

Refer to DTC P0045/34 on page Click here.

DTC No.
DTC Detection Condition
Trouble Area
P0234/34
When turbocharger boost pressure continues to be higher than ECM's target boost pressure.
(1 trip detection logic)
  1. Turbocharger sub-assembly
  2. Turbo motor driver
  3. Manifold absolute pressure sensor
  4. MAF meter
  5. EGR valve stuck closed
  6. Exhaust system and intake system are modified or clogged
  7. ECM
P0299/34
When turbocharger boost pressure continues to be lower than ECM's target boost pressure.
(1 trip detection logic)
  1. Turbocharger sub-assembly
  2. Turbo motor driver
  3. Manifold absolute pressure sensor
  4. MAF meter
  5. EGR valve stuck open
  6. Manifold absolute pressure sensor (hose disconnected)
  7. Exhaust system and intake system are modified or clogged
  8. ECM
P1251/34
When turbocharger boost pressure is higher than boost pressure for a short time in which there was possibility of engine damage.
(1 trip detection logic)
  1. Turbocharger sub-assembly
  2. Turbo motor driver
  3. Manifold absolute pressure sensor
  4. MAF meter
  5. EGR valve assembly
  6. Exhaust system and intake system are modified or clogged
  7. ECM

WIRING DIAGRAM

Refer to DTC P0045/34 on page Click here.

INSPECTION PROCEDURE

HINT:
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 running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

NOTICE:
If the ECM is replaced, the new ECM needs initialization (Click here).

1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0234/34, P0299/34 AND /OR P1251/34)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

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

  1. Read the DTCs.

    Result:
    Display (DTC Output)
    		Proceed to
    P0234/34, P0299/34 and/or P1251/34
    		A
    P0234/34, P0299/34 and/or P1251/34 and other DTCs
    		B



B
GO TO RELEVANT DTC CHART
A


2.READ DATA LIST (MAP)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and warm it up. Turn the intelligent tester ON.

  1. Enter the following menu: Powertrain / Engine / Data List / MAP.

    Standard:
    Item
    		Engine Speed*
    		Reference Value
    MAP
    		Ignition switch ON
    		Same as atmospheric pressure
    MAP
    		Idling
    		95 to 105 kPa
    (713 to 788 mmHg, 28.1 to 31 in.Hg)
    MAP
    		3,000 rpm (no engine load)
    		110 to 135 kPa
    (825 to 1,012 mm Hg, 32.5 to 39.9 in.Hg)

    HINT:
    *: If no idling conditions are specified, the A/C switch and all accessory switches should be OFF with a fully warm engine.



NG
REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR
OK


3.CHECK EXHAUST SYSTEM

  1. Turn the ignition switch ON.

  1. Check the exhaust pipe for leaks.

    OK:
    Exhaust pipe has no leaks.



NG
REPAIR OR REPLACE
OK


4.CHECK AIR CLEANER FILTER

  1. Check that the air cleaner filter is not clogged.

    OK:
    Air cleaner filter is not clogged.



NG
REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSY
OK


5.CHECK INTAKE SYSTEM

  1. Disconnect the air cleaner hose.

  1. Use a mirror to visually check the turbocharger for any mechanical problems.

  1. When the engine is cold, check that the impeller of the turbocharger rotates smoothly, and perform a contact check to confirm whether there is any damage on it.

    OK:
    impeller of turbocharger rotates smoothly.



NG
REPAIR OR REPLACE INTAKE SYSTEM
OK


6.INSPECT TURBOCHARGER SUB-ASSEMBLY

  1. Disconnect the air cleaner hose.

  1. Use a mirror to visually check the turbocharger for any mechanical problems.

  1. When the engine is cold, check that the impeller of the turbocharger rotates smoothly, and perform a contact check to confirm whether there is any damage on it.

    OK:
    Impeller of turbocharger rotates smoothly.



NG
REPLACE TURBOCHARGER SUB-ASSEMBLY
OK


7.CHECK ECM (VNTI VOLTAGE)
G036520E02

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

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



NG
REPLACE ECM
OK


8.CHECK ECM (VNTO VOLTAGE)
A099245E02

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

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



NG
REPLACE TURBO MOTOR DRIVER
OK


9.CHECK EGR VALVE ASSEMBLY


NG
REPLACE EGR VALVE ASSEMBLY
OK


10.INSPECT INTAKE AIR TEMPERATURE SENSOR
A114041E01

  1. Check the IAT sensor.

    1. Remove the MAF meter.

    2. Measure the resistance of the sensor.

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      4 - 5
      		-20°C (-4°F)
      		13.6 to 18.4 kΩ
      4 - 5
      		20°C (68°F)
      		2.21 to 2.69 kΩ
      4 - 5
      		60°C (140°F)
      		0.49 to 0.67 kΩ



NG
REPLACE MASS AIR FLOW METER
OK

REPLACE ECM