ECD SYSTEM (w/ DPF), Diagnostic DTC:P143C, P143D

DTC Code DTC Name
P143C EGR Cooler Bypass Control "B" Circuit Low
P143D EGR Cooler Bypass Control "B" Circuit High

DESCRIPTION

The vacuum switching valve (for No. 2 EGR bypass valve) is controlled by the ECM, and the opening and closing of the EGR cooler bypass valve is performed according to the vacuum applied by the vacuum pump.

P143C
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 3 seconds Open or short in the vacuum switching valve (for No. 2 EGR bypass valve) for 3 seconds (1 trip detection logic).

  • Open or short in vacuum switching valve (for No. 2 EGR bypass valve) circuit

  • Vacuum switching valve (for No. 2 EGR bypass valve)

  • ECM
P143D
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 3 seconds Open or short in the vacuum switching valve (for No. 2 EGR bypass valve) for 3 seconds (1 trip detection logic).

  • Open or short in vacuum switching valve (for No. 2 EGR bypass valve) circuit

  • Vacuum switching valve (for No. 2 EGR bypass valve)

  • ECM

WIRING DIAGRAM

A01DPMYE08

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, 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 VACUUM SWITCHING VALVE (FOR NO. 2 EGR BYPASS VALVE)


    1. Inspect the vacuum switching valve (for No. 2 EGR bypass valve) Click here.


    NG

    REPLACE VACUUM SWITCHING VALVE (FOR NO. 2 EGR BYPASS VALVE) Click here

    OK

  2. CHECK VACUUM SWITCHING VALVE (FOR NO. 2 EGR BYPASS VALVE) (POWER SOURCE CIRCUIT)


    1. A01DSYKE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Vacuum Switching Valve (for No. 2 EGR Bypass Valve))

      Disconnect the vacuum switching valve (for No. 2 EGR bypass valve) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C128-1 - Body ground Engine switch on (IG) 11 to 14 V

    3. Reconnect the vacuum switching valve (for No. 2 EGR bypass valve) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE (FOR NO. 2 EGR BYPASS VALVE) - ECM)


    1. Disconnect the vacuum switching valve (for No. 2 EGR bypass valve) connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C128-2 - C57-22 (ECB2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C128-2 or C57-22 (ECB2) - Body ground Always 10 kΩ or higher

    4. Reconnect the vacuum switching valve (for No. 2 EGR bypass valve) 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 VACUUM SWITCHING VALVE (FOR NO. 2 EGR BYPASS VALVE)


    1. Replace the vacuum switching valve (for No. 2 EGR bypass valve).


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Tech Tips

      If the voltage at the vacuum switching valve (for No. 2 EGR bypass valve) connector is not 11 to 14 V, repair or replace the harness and connector between the vacuum switching valve (for No. 2 EGR bypass valve) and EFI relay (including the EFI No. 2 fuse).


    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 engine switch on (IG) for 3 seconds.

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

    5. Confirm that the DTC is not output again.


    NEXT

    END