ECD SYSTEM (w/ DPF), Diagnostic DTC:P20CB, P20CD, P20CE

DTC Code DTC Name
P20CB Exhaust Aftertreatment Fuel Injector "A" Control Circuit Stuck Open
P20CD Open in Exhaust Aftertreatment Fuel Injector "A" Control Circuit
P20CE Short in Exhaust Aftertreatment Fuel Injector "A" Control Circuit

DESCRIPTION

A01KIBAE03

The exhaust fuel addition injector assembly is mounted on the outlet of the turbocharger sub-assembly, and low pressure fuel is supplied to the injector assembly by the feed pump in the fuel supply pump assembly. 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 P20CB, P20CD and P20CE are present, refer to the DTC table for Diesel Particulate Filter System Click here.

P20CB
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds

With the exhaust fuel addition injector off, the FIVM1 output is high and the FIVM2 output is low for 3 seconds.

(1 trip detection logic)

  • Open in exhaust fuel addition injector assembly circuit

  • Exhaust fuel addition injector assembly

  • ECM
P20CD
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 1 second

With the exhaust fuel addition injector off, the FIVM1 output is high and the FIVM2 output is high for 0.16 seconds.

(1 trip detection logic)

  • Open in exhaust fuel addition injector assembly circuit

  • Exhaust fuel addition injector assembly

  • ECM
P20CE
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Drive vehicle for 20 minutes (exhaust gas temperature is 250°C (482°F) or higher).

With the exhaust fuel addition injector on, the FIVM1 output is low and the FIVM2 output is low 7 or more times.

(1 trip detection logic)

  • Open in exhaust fuel addition injector assembly circuit

  • Exhaust fuel addition injector assembly

  • ECM

Tech Tips

DTC P200C and/or P20CF 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 assembly, an internal CPU of the ECM monitors injection command (FIV) signals and injection confirmation (FIVM) signals. The FIV signal is sent from the CPU to the exhaust fuel addition injector via a drive circuit inside the ECM. The FIVM 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 FIVM signal, the ECM judges that the current has been applied to the exhaust fuel addition injector.

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

A01KFGDE07

WIRING DIAGRAM

A01KHRSE02

INSPECTION PROCEDURE

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 Click here and initialization Click here.

  • After replacing the fuel supply pump assembly or 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 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

    REPAIR EXHAUST FUEL ADDITION INJECTOR ASSEMBLY Click here

    OK

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE)


    1. A01KEFPE12
      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
      E27-2 (+B) - Body ground Ignition switch ON 11 to 14 V

    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
      E27-1 (FIV) - E10-5 (FIV) Always Below 1 Ω
      E27-1 (FIV) or E10-5 (FIV) - Body ground Always 10 kΩ or higher

    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. REPAIR 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.


    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. Drive the vehicle for 20 minutes.

      Note

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

      Tech Tips

      The exhaust gas temperature increases to 250°C (482°F) or higher after driving the vehicle for 20 minutes.

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

    5. Confirm that the DTC is not output again.


    NEXT

    END