ECD SYSTEM, Diagnostic DTC:P042E

DTC Code DTC Name
P042E Exhaust Gas Recirculation "A" Control Stuck Open

DESCRIPTION

The EGR system recirculates exhaust gases. The recirculated gas mingles with the intake air so that the EGR system can slow combustion speed and keep the combustion temperature down. This helps reduce NOx emissions.

In order to increase EGR circulation efficiency, the ECM adjusts the EGR valve angle and the throttle valve angle.

P042E
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After warming up engine and idling for 60 seconds, maintain engine speed at 2500 rpm for 40 seconds, drive vehicle, and perform engine brake deceleration by fully closing accelerator when engine speed is 2000 rpm or more.

The target and actual positions of the EGR valve are different for 20 seconds or more.

(1 trip detection logic)


  • EGR valve stuck

  • EGR valve does not move smoothly

  • EGR valve deposit

  • ECM

While the engine is running, the EGR activation duty exceeds the threshold for 0.5 seconds a certain number of times (40 seconds or more).

(1 trip detection logic)

Related Data List
DTC No. Data List
P042E
  • MAF

  • MAP

  • EGR Close Lrn. Val.

  • Target EGR Valve Pos

  • Actual EGR Valve Pos

Tech Tips


  • Actual EGR valve opening percentage: Fully closed = 0%, fully open = 100%.

  • If DTC P042E is stored, the following symptoms may appear:


    • Stuck closed malfunction


      • Lack of power: due to fail-safe operation (only for vehicle with DPF catalyst)

      • Intake booming noise

      • Slight combustion noise


    • Stuck open malfunction


      • Black smoke

      • Lack of power

      • Vibration at engine stop

      • Misfire

      • White smoke

      • Engine stall

MONITOR DESCRIPTION

When the target and actual positions of the EGR valve are different, the ECM interprets this as a malfunction of the electric EGR control valve assembly and illuminates the MIL (1 trip detection logic).

B007PK8E02

Tech Tips


  • If a large amount of carbon deposits exists in the electric EGR control valve assembly, the following parts possibly also have deposits inside: The intake manifold, EGR cooler sub-assembly, exhaust fuel addition injector assembly (if equipped), exhaust manifold converter sub-assembly (DPF catalyst), and other parts related to the exhaust gas.

  • Be sure to carefully examine "Actual EGR Valve Pos", "Target EGR Valve Pos" and "MAF" in the freeze frame data.

WIRING DIAGRAM

B007ODOE04

INSPECTION PROCEDURE

Note


  • When cleaning the electric EGR control valve assembly or diesel throttle body assembly, use a piece of cloth soaked with cleaning solvent. Spraying the solvent directly onto these parts or soaking the parts in solvent may damage the parts.

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

Tech Tips

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 P042E)


    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.

      Result
      Result Proceed to
      DTC P042E is output A
      DTC P042E and other DTCs are output B

      Tech Tips

      If any DTCs other than DTC P042E are output, troubleshoot those DTCs first.


    B
    A
  2. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)


    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 / Active Test / Control the EGR Step Position / Data List / Target EGR Valve Pos and Actual EGR Valve Pos

    4. When changing the Active Test value for 1, 30, 60, 90, 60, 30 and 1%, check that Actual EGR Valve Pos smoothly changes to the set opening angle.

      OK
      The Actual EGR Valve Pos. value follows the Target EGR Valve Pos. value.

    NG
    OK
  3. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)


    1. Remove the electric EGR control valve assembly Click here.

    2. Reconnect the electric EGR control valve assembly connector.

    3. Connect the GTS to the DLC3.

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

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

    6. Check if the valve of the electric EGR control valve assembly opens/closes when an Active Test is performed.

      OK
      The valve opens/closes.
    7. B007PO7E01
      Text in Illustration
      *1 Gap
      *a OK
      *b NG

      Hold the electric EGR control valve assembly up to a light, and then from the side indicated by the arrow in the illustration, visually check that there is no gap between the valve and body.

      OK
      No light passes through (there is no gap between the valve and body).

      Tech Tips

      Light passes through part A shown in the illustration even if the valve is completely closed as there is an opening in the sealring of the valve. This is not a problem.

      Result
      Result Proceed to
      NG A
      OK B

      Tech Tips


      • If light passes through (there is a gap between the valve and body), replace the electric EGR control valve assembly.

      • Remove the deposits if there are many deposits in the electric EGR control valve assembly or the passage of the intake manifold.

    8. Reinstall the electric EGR control valve assembly Click here.


    B
    A
  4. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly Click here.

      Tech Tips

      Before replacing the electric EGR control valve assembly, check the connections of the wire harness and connectors. If there is any abnormality, replace or repair the wire harness or connector.


    NEXT
  5. CHECK FOR DEPOSIT


    1. Remove the electric EGR control valve assembly Click here.

    2. Visually check the electric EGR control valve assembly for deposits.

      If there are deposits, clean the electric EGR control valve assembly.

      Note


      • When cleaning the electric EGR control valve, make sure the valve is completely closed.

      • Do not forcibly open the valve, as it may be damaged or deformed.

      • When cleaning the electric EGR control valve, use a piece of cloth soaked with cleaning solvent. Spraying the solvent directly onto these parts or soaking the parts in the solvent may damage the parts.

      • When cleaning the EGR control valve, care should be taken to prevent the ingress of cleaning solvent into the bearings of valve shaft, and when wiping off deposits on the EGR control valve, care should be taken not to push the deposits into the bearings of valve shaft. These contaminants may adversely affect on the function of EGR control valve.

      Tech Tips


      • If the EGR valve does not open properly or is stuck closed, the amount of intake air increases and combustion sounds and engine vibration may increase.

      • If the EGR valve does not close properly or is stuck open, EGR becomes excessive and combustion becomes unstable. Also, there may be a lack of power.

    3. Reinstall the electric EGR control valve assembly Click here.


    NEXT
  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off and wait for 30 seconds or more.

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

    7. After warming up engine and idling for 60 seconds, maintain engine speed at 2500 rpm for 40 seconds, drive vehicle, and perform engine brake deceleration by fully closing accelerator when engine speed is 2000 rpm or more.

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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

    9. Confirm that the DTCs is not output again.


    NEXT