ECD SYSTEM(for DPF), Diagnostic DTC:P20CD

DTC Code DTC Name
P20CD Open in Exhaust Aftertreatment Fuel Injector "A" Control Circuit

DESCRIPTION

A004QDOE04

The exhaust fuel addition injector is mounted on the outlet of the turbocharger sub-assembly, and low pressure fuel is supplied to the injector by the feed pump in the supply pump. This injector adds fuel by a control signal from the ECM.

This injector is used for two different controls: PM forced regeneration and PM reduction.

During PM forced regeneration, the injector adds fuel to raise the catalyst temperature.

In the other control, the injector helps the air-fuel ratio become rich. As a result, PM in the exhaust gas will be reduced in response to the rich air-fuel ratio.

Tech Tips


  • For more information on the exhaust fuel addition injector and DPF, refer to the following procedures Click here.

  • If P20CD is present, refer to the DTC table for Diesel Particulate Filter System Click here.

P20CD
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds

With the exhaust fuel addition injector off, the FIVO output is high for 3 seconds.

(1 trip detection logic)

  • Open or short in exhaust fuel addition injector assembly circuit

  • Exhaust fuel addition injector assembly

  • ECM

Tech Tips

DTC P200C, P200E, P20CF and/or P2428 will be present if there is an open malfunction in the exhaust fuel addition injector circuit.

MONITOR DESCRIPTION

In order to detect abnormality in the fuel addition injector, an internal CPU of the ECM monitors injection command (FIV) signals and injection confirmation (FIVO) signals. The FIV signal is sent from the CPU to the exhaust fuel addition injector via a drive circuit inside the ECM. The FIVO signal, which is originally output current from the internal drive circuit of the ECM, is transmitted to the CPU via a monitor circuit. By receiving the FIVO signal, the ECM judges that the current has been applied to the exhaust fuel addition injector.

This DTC will be set if the ECM judges that the number of signals of the FIV and FIVO are inconsistent.

A004NH3E01
*1 Monitor Circuit
*2 to Fuel Addition Injector
*3 Command Circuit

WIRING DIAGRAM

A004MXFE22

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

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

Tech Tips

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.

PROCEDURE


  1. INSPECT EXHAUST FUEL ADDITION INJECTOR ASSEMBLY (RESISTANCE)


    1. Inspect the exhaust fuel addition injector assembly Click here.


    NG

    REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY Click here

    OK

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE)


    1. A004S9UE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Exhaust Fuel Addition Injector Assembly)

      Disconnect the exhaust fuel addition injector assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B74-2 - Body ground Ignition switch ON 11 to 14 V

    3. Reconnect the exhaust fuel addition injector assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (EXHAUST FUEL ADDITION INJECTOR ASSEMBLY - ECM)


    1. Disconnect the exhaust fuel addition injector assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B74-1 - B39-105 (FIV) Always Below 1 Ω
      B74-1 or B39-105 (FIV) - Body ground Always 10 kΩ or higher

    4. Reconnect the exhaust fuel addition injector assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY


    1. Replace the exhaust fuel addition injector assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Tech Tips

    If the voltage at the exhaust fuel addition injector assembly connector is not 11 to 14 V, repair or replace the harness and connector between the exhaust fuel addition injector assembly and EFI MAIN relay (including the EFI No. 2 fuse).


    1. Repair or replace the harness or connector.


    NEXT

  7. 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 for 30 seconds or more.

    4. Turn the ignition switch to ON for 3 seconds.

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

    6. Confirm that the DTC is not output again.


    NEXT

    END