ECD SYSTEM(for DPF), 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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P042E

Exhaust Gas Recirculation "A" Control Stuck Open

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

    (1 trip detection logic)

  • 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)

  • EGR valve stuck

  • EGR valve does not move smoothly

  • EGR valve deposit

  • ECM

Comes on

DTC stored
Table 1. Related Data List

DTC No.

Data List

P042E

  • MAF

  • MAP

  • EGR Close Lrn. Val.

  • EGR Close Lrn. Status

  • Target EGR Position

  • Actual EGR Valve Pos.
Tip:

  • 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).

A208465E02
Tip:

  • 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 assembly, exhaust fuel addition injector assembly (if equipped), DPF catalyst, and other parts related to the exhaust gas.

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

CONFIRMATION DRIVING PATTERN

DTC No.

DTC Detection Drive Pattern

P042E

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.

WIRING DIAGRAM

A204587E08

CAUTION / NOTICE / HINT

Note:

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

Tip:

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.

    3. Turn the GTS on.

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

      Powertrain > Engine > Trouble Codes

    5. Read the DTCs.

      Result

      Proceed to

      P042E is output

      P042E and other DTCs are output
      Tip:

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

    P042E and other DTCs are output

    GO TO DTC CHART

    Click hereClick here

    P042E is output

  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.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Target EGR Position and Actual EGR Valve Pos.

      Powertrain > Engine > Active Test

      Active Test Display

      Control the EGR Step Position

      Data List Display

      Target EGR Position

      Actual EGR Valve Pos.

    5. When changing the Active Test value for 1, 25, 50, 75 and 100%, check that Actual EGR Valve Pos. smoothly changes to the set opening angle.

      OK

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

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLYClick here

    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.

    5. Turn the GTS on.

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

      Powertrain > Engine > Active Test

      Tester Display

      Control the EGR Step Position

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

      OK

      The valve opens/closes.

    8. A201816C04

      *a

      OK

      *b

      NG

      *c

      Gap

      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).

      Result

      Result

      Proceed to

      NG

      A

      OK

      B
      Tip:

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

      • Light passes through part A shown in the illustration even if the valve is completely closed. This is not a problem.

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

    B

    CHECK FOR DEPOSITClick here

    A

  4. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY

    1. Replace the electric EGR control valve assembly.

      Click here

      Tip:

      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.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  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.

      Tip:

      • 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

    Result

    Proceed to

    NEXT
    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.

      Powertrain > Engine > Clear DTCs

    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 higher.

      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.

      Powertrain > Engine > Trouble Codes

    9. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END