ECD SYSTEM, Diagnostic DTC:P1286

DTC Code DTC Name
P1286 EGR Valve Load Error

DESCRIPTION

The EGR system recirculates exhaust gases in a way that suits every driving condition. The recirculated gas mixes with intake air. Therefore, the EGR system can slow combustion speed and keep the combustion temperature down. This helps reduce NOx emission.

In order to increase EGR circulation efficiency, the ECM adjusts the lift amount of the EGR valve and the throttle valve angle.

DTC No. DTC Detection Condition Trouble Area
P1286

When block error is detected in vacuum switching valve assembly output portion for 0.2 seconds or more

(3 trip detection logic)


  • Vacuum switching valve assembly

  • Open or short in vacuum switching valve assembly circuit

  • ECM

Related Data List
DTC No. Data List
P1286
  • Actual EGR Valve Pos.

  • Target EGR Valve Pos.

WIRING DIAGRAM

A01IQ0YE01

INSPECTION PROCEDURE

Note


  • When replacing the ECM, the ECM needs Registration and Initialization Click here.


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

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • 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 HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE ASSEMBLY - ECM)


    1. Disconnect the vacuum switching valve assembly connector.

    2. Disconnect the ECM connector.

    3. Remove the EFI MAIN relay from the engine room No. 1 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C79-2 (EGR) - C84-47 (EGR) Always Below 1 Ω
      C79-1 (B) - 3 (EFI MAIN relay holder) Always Below 1 Ω
      C79-2 (EGR) or C84-47 (EGR) - Body ground Always 10 kΩ or higher
      C79-1 (B) or 3 (EFI MAIN relay holder) - Body ground Always 10 kΩ or higher

    NG
    OK
  2. CHECK TERMINAL VOLTAGE (POWER SOURCE)


    1. Disconnect the vacuum switching valve assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C79-1 (B) - Body ground Engine switch on (IG) 11 to 14 V

    NG
    OK
  3. REPLACE VACUUM SWITCHING VALVE ASSEMBLY


    1. Replace the vacuum switching valve assembly Click here.


    NEXT
  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P1286)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Turn the ignition switch to ON and wait for 15 seconds or more [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

    8. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P1286 B

    B
    A
  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT
  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT
  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Turn the ignition switch to ON and wait for 15 seconds or more [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

    8. Confirm that the DTC is not output again.


    NEXT