СИСТЕМА ECD, Diagnostic DTC:P20CF

DTC Code DTC Name
P20CF Exhaust Aftertreatment Fuel Injector "A" Stuck Open

DESCRIPTION

Refer to DTC P200C.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P20CF Exhaust Aftertreatment Fuel Injector "A" Stuck Open AF Lambda B1S1 is less than 0.85 for a certain time while the engine is running (1 trip detection logic).

  • Open or short in exhaust fuel addition injector assembly circuit

  • Exhaust fuel addition injector assembly

  • Fuel filter element sub-assembly


    Common Inspection Item:

  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system

 Comes on DTC stored
Related Data List
DTC No. Data List
P20CF/94

AF Lambda B1S1

Exhaust Temperature B1S2

Exhaust Temperature B1S3

MONITOR DESCRIPTION

The ECM monitors the air fuel ratio to detect whether the exhaust fuel addition injector assembly is stuck open.

If the air fuel ratio becomes too rich, the ECM determines that the exhaust fuel addition injector assembly is stuck open, illuminates the MIL and limits engine output.

A012J6XE01

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P20CF PM forced regeneration

CAUTION / NOTICE / HINT

Note


  • After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

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

  • After replacing the suction control valve, the ECM needs initialization.

    Click here

  • After replacing an injector assembly, the ECM needs registration.

    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 DTC OUTPUT (IN ADDITION TO DTC P20CF)


    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.

    5. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P20CF is output A
      DTC P20CF and other DTCs are output B

      Tech Tips


      • When DTC P20CF and following DTCs are output, uncombusted fuel adhesion to the air fuel ratio sensor due to air fuel ratio sensor malfunction, fuel leaks, insufficient combustion due to parts malfunction (intake, exhaust or injection system), or an exhaust fuel addition injector assembly wiring malfunction is suspected as a cause. Therefore, diagnose the following DTCs first.

      • DTCs for the air fuel ratio sensor are P2237, P2238, P2239, P2252 and P2253.

        Click here

      • A DTC for fuel leakage is P0093.

        Click here

      • DTCs for the exhaust fuel addition injector assembly wiring malfunction is P20CD.

        Click here

      • A DTC for EGR valve flow malfunction is P0400.

        Click here

      • A DTC for EGR valve stuck open is P042E.

        Click here


    B

    GO TO DTC CHART Click here

    A

  2. CHECK FOR WHITE SMOKE (WHITE SMOKE AND ODOR)

    Note

    If a fuel odor is noted from the white smoke during the inspection, fuel leaks from the exhaust fuel addition injector assembly are suspected.


    1. Disconnect the cable from the negative (-) battery terminal or remove the EFI-MAIN fuse for 1 minute or more.

    2. Start the engine and race it to 3000 rpm several times.

    3. Check for white smoke in the exhaust gas. If found, check for a fuel odor or the smell of burning oil.

      Result
      Result Proceed to
      White smoke and a fuel odor are present. A
      White smoke and a smell of burning oil are present. B
      Except above C

    B

    CHECK AND REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    C

    GO TO STEP 7 Click here

    A

  3. PERFORM CONFIRMATION DRIVING PATTERN (WHITE SMOKE AND SENSORY INSPECTION)


    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 / Data List / All Data / AF Lambda B1S1 and Exhaust Temperature B1S3.


      Powertrain > Engine and ECT > Data List
      Tester Display
      AF Lambda B1S1
      Exhaust Temperature B1S3

    5. Drive the vehicle until the value of Exhaust Temperature B1S3 becomes 300°C (572°F) or higher to activate the air fuel ratio sensors.

      Tech Tips

      Activation of the air fuel ratio sensor can be checked by confirming whether the value of AF Lambda B1S1 has changed from 1.99.

    6. Check that there is no problem on driving performance such as hesitation, knocking, rough idling, insufficient power and acceleration stumbling, or white smoke in emissions.

      A012G94E04

      Tech Tips


      • The air fuel ratio sensor does not operate until the vehicle has been driven for a period of time with an exhaust gas temperature of 200°C (392°F) or higher.

      • Perform diagnosis when the air fuel ratio sensor is operating and active.

      • Normal condition in the illustration is only an example. "AF Lambda B1S1" changes depending on driving conditions. If it changes at the range more than 1.0, it is normal.

      Result
      Result Proceed to
      There is no problem with driving performance such as hesitation, knocking, rough idling, insufficient power or acceleration stumbling, but excessive white smoke is present in the exhaust gas A
      Except above B

      Tech Tips

      If white smoke is present in the exhaust gas without any driving performance problems such as hesitation, knocking, rough idling, insufficient power or acceleration stumbling, fuel injected due to a malfunction in the exhaust fuel addition injector assembly is the suspected cause of the white smoke.


    B

    GO TO STEP 7 Click here

    A

  4. REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY


    1. Replace the exhaust fuel addition injector assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. REPLACE FUEL FILTER ELEMENT SUB-ASSEMBLY


    1. Replace the fuel filter element sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. PERFORM PM FORCED REGENERATION


    1. Clear the DTC and Exhaust Fuel Addition FB value by disconnecting the cable from the negative (-) battery terminal or removing the EFI-MAIN fuse for 1 minute or more.

      Tech Tips


      • The accumulated PM volume stored in the ECM cannot be initialized using the GTS.

      • To perform PM forced regeneration, it is necessary to perform initialization of the accumulated PM volume stored in the ECM.

    2. Connect the GTS to the DLC3.

    3. Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°F) or higher.

    4. Move the shift lever to neutral and set the parking brake.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the DPF Rejuvenate (PM) / All Data / PM Accumulation Ratio.


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Activate the DPF Rejuvenate (PM)
      Data List Display
      PM Accumulation Ratio

    7. Perform the Active Test while the vehicle is driven at a constant vehicle speed within 50 to 100 km/h (31 to 62 mph) (transaxle in 3rd gear) for more than 15 minutes.

      CAUTION:

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

      Tech Tips


      • While the "Activate the DPF Rejuvenate (PM)" Active Test is being performed, the accelerator opening angle should be kept as constant as possible.

      • When you start driving, "DPNR/DPF Status Reju(PM)" on the Data List displays "Compl". However, continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.

      • Once "PM Accumulation Ratio" drops to 0%, regeneration is complete.

    8. Continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.

      CAUTION:

      Be aware of excessive heat on and around the exhaust pipes during PM forced regeneration.

      Note

      If PM forced regeneration stops, repair the malfunction that caused it to stop, and perform it again to complete the operation.

      Tech Tips


      • PM forced regeneration completes in 15 to 40 minutes.

      • PM forced regeneration time changes depending on PM Accumulation Ratio and driving conditions.

      • A fail-safe stops PM forced regeneration if Catalyst Differential Press increases too much during regeneration.

      • Exhaust Temperature B1S3 becomes 500°C (932°F) or higher within 20 minutes of PM forced regeneration start.

      • PM forced regeneration will be stopped if the accelerator pedal is depressed during regeneration. In this case, PM forced regeneration needs to be performed again.

      • Even if PM forced regeneration stops while it is occurring, the GTS displays Compl (complete) for DPNR/DPF Status Reju(PM).

      OK
      PM forced regeneration completes normally.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  7. CHECK FUEL INJECTION SYSTEM


    1. Check the fuel injection system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK INTAKE / EXHAUST SYSTEM


    1. Check the intake/exhaust system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK AFTER TREATMENT CONTROL SYSTEM


    1. Check the after treatment control system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 11 Click here

  10. CHECK AND REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Check for oil leaks and white smoke from the turbocharger sub-assembly and perform any necessary repairs.

      Click here

      Tech Tips

      Other than a malfunction of the turbocharger sub-assembly, exhaust valve stem oil leaks are suspected.

      Result
      Proceed to
      NEXT

    NEXT

  11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Clear the DTC and Exhaust Fuel Addition FB value by disconnecting the cable from the negative (-) battery terminal or removing the EFI-MAIN fuse for 1 minute or more.

      Tech Tips


      • The accumulated PM volume stored in the ECM cannot be initialized using the GTS.

      • To perform PM forced regeneration, it is necessary to perform initialization of the accumulated PM volume stored in the ECM.

    2. Connect the GTS to the DLC3.

    3. Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°F) or higher.

    4. Move the shift lever to neutral and set the parking brake.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the DPF Rejuvenate (PM) / All Data / PM Accumulation Ratio.


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Activate the DPF Rejuvenate (PM)
      Data List Display
      PM Accumulation Ratio

    7. Perform the Active Test while the vehicle is driven at a constant vehicle speed within 50 to 100 km/h (31 to 62 mph) (transaxle in 3rd gear) for more than 15 minutes.

      CAUTION:

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

      Tech Tips


      • While the "Activate the DPF Rejuvenate (PM)" Active Test is being performed, the accelerator opening angle should be kept as constant as possible.

      • When you start driving, "DPNR/DPF Status Reju(PM)" on the Data List displays "Compl". However, continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.

      • Once "PM Accumulation Ratio" drops to 0%, regeneration is complete.

    8. Continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.

      CAUTION:

      Be aware of excessive heat on and around the exhaust pipes during PM forced regeneration.

      Note

      If PM forced regeneration stops, repair the malfunction that caused it to stop, and perform it again to complete the operation.

      Tech Tips


      • PM forced regeneration completes in 15 to 40 minutes.

      • PM forced regeneration time changes depending on PM Accumulation Ratio and driving conditions.

      • A fail-safe stops PM forced regeneration if Catalyst Differential Press increases too much during regeneration.

      • Exhaust Temperature B1S3 becomes 500°C (932°F) or higher within 20 minutes of PM forced regeneration start.

      • PM forced regeneration will be stopped if the accelerator pedal is depressed during regeneration. In this case, PM forced regeneration needs to be performed again.

      • Even if PM forced regeneration stops while it is occurring, the GTS displays Compl (complete) for DPNR/DPF Status Reju(PM).

      Result
      Proceed to
      NEXT

    NEXT

    END

  12. GO TO DTC CHART


    1. Perform inspection and repair of relevant DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 11 Click here