ECD SYSTEM, Diagnostic DTC:P1470,P1471,P1472 and P1474

DTC Code DTC Name
P1470 Permanent Positive Governor Deviation
P1471 Permanent Negative Governor Deviation
P1472 Jammed Valve
P1474 Jammed Valve During Offset Learning

DESCRIPTION

Refer to DTC P2016.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1470

Permanent Positive Governor Deviation

The control error of the swirl control valve exceeds 5% and the measured position is less than 120% for 3 seconds or more.

(3 trip detection logic)

  • Open or short in swirl control valve circuit

  • Swirl control valve

Does not come on

DTC stored

P1471

Permanent Negative Governor Deviation

The control error of the swirl control valve exceeds -5% and the measured position is less than 120% for 3 seconds or more.

(3 trip detection logic)

  • Open or short in swirl control valve circuit

  • Swirl control valve

Does not come on

DTC stored

P1472

Jammed Valve

Even if the control error of the swirl control valve is not between -5% and 5% and 1.6 seconds elapse since the time the actuator operated, the control error does not recover for 3 seconds or more.

(3 trip detection logic)

  • Open or short in swirl control valve circuit

  • Swirl control valve

Does not come on

DTC stored

P1474

Jammed Valve During Offset Learning

The swirl control valve is unable to perform swirl-flap control within the specified time (3 seconds for open side, 4 seconds for close side) during the adaption phase.

(3 trip detection logic)

  • Open or short in swirl control valve circuit

  • Swirl control valve

Does not come on

DTC stored
Table 1. Related Data List

DTC No.

Data List

P1470

P1471

P1472

P1474

Swirl Valve Actuator Position

WIRING DIAGRAM

Refer to DTC P2016.

Click here

CAUTION / NOTICE / HINT

Note:

After replacing the swirl control valve, the ECM needs initialization.

Click here

Tip:

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 SWIRL CONTROL VALVE

    1. Check for soot deposits inside the swirl control valve.

      OK

      No soot deposits.

      Tip:

      • If soot deposits are found, clean the swirl control valve.

      • If cleaning does not remove the soot deposits, replace the swirl control valve.

    2. Check for the operation mechanism of the swirl control valve for damage such as link deformation.

      OK

      No damage.

    3. Check operation.

      1. Connect the GTS to the DLC3.

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

      3. Start the engine.

      4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Actuator Test of Swirl Flap / Data List / Swirl Valve Actuator Position.

        Powertrain > Engine and ECT > Active Test

        Active Test Display

        Actuator Test of Swirl Flap

        Data List Display

        Swirl Valve Actuator Position

        OK

        The value of "Swirl Valve Actuator Position" changes according to the amount "Actuator Test of Swirl Flap" is operated, and the swirl flap operates smoothly.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE SWIRL CONTROL VALVEClick here

    OK

  2. CHECK HARNESS AND CONNECTOR (SWIRL CONTROL VALVE - ECM)

    1. Disconnect the swirl control valve 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

      B238-3 (SCV+) - B220-49 (IA1+)

      Always

      Below 1 Ω

      B238-4 (SCV-) - B220-19 (IA1-)

      Always

      Below 1 Ω

      B238-3 (SCV+) or B220-49 (IA1+) - Body ground

      Always

      10 kΩ or higher

      B238-4 (SCV-) or B220-19 (IA1-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE SWIRL CONTROL VALVEClick here

    NG

  3. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  4. REPLACE SWIRL CONTROL VALVE

    1. Replace the swirl control valve.

      Click here

    2. Perform the swirl valve learning value reset.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  5. 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.

      Powertrain > Engine and ECT > Clear DTCs

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

    5. Perform road test [B].

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

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

      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END