ECD SYSTEM, Diagnostic DTC:P20CD

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

DESCRIPTION

Refer to DTC P200C Click here.

Tech Tips


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

  • If DTC 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
Engine switch on (IG) for 3 second

With the exhaust fuel addition injector assembly 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 assembly 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 (FIVO) signals. The FIV signal is sent from the CPU to the exhaust fuel addition injector assembly 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 assembly.

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

B001EQ5E05
*1 to Fuel Addition Injector Assembly
*2 Monitor Circuit
*3 Command Circuit

WIRING DIAGRAM

B001IFKE04

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 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. 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. B001DGXE01
      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
      C126-2 - Body ground Engine switch on (IG) 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
      C126-1 - G184-6 (FIV) Always Below 1 Ω
      C126-1 or G184-6 (FIV) - Body ground and other terminal 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 No. 1 integration relay.


    1. Repair or replace the harness or connector.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off for 30 seconds or more.

      Tech Tips

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

    4. Turn the engine switch on (IG) for 3 seconds.

    5. Turn the GTS on.

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

    7. Confirm that the DTC is not output again.


    NEXT

    END