Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
1Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING GTS (DIESEL THROTTLE TARGET ANGLE)

CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR POWER SOURCE)

CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)

REMOVE DEPOSIT (DIESEL THROTTLE BODY ASSEMBLY)

PERFORM ACTIVE TEST USING GTS (DIESEL THROTTLE TARGET ANGLE)

REPLACE DIESEL THROTTLE BODY ASSEMBLY

CHECK WHETHER DTC OUTPUT RECURS

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE CONTROL MOTOR - NO. 1 INTEGRATION RELAY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance


DESCRIPTION

The ECM opens and closes the throttle valve using a rotary solenoid type actuator. Due to the opening and closing of the valve, the exhaust gas recirculation volume can be properly controlled. Also, engine vibration and noise will be reduced by closing the valve when the engine is stopped.

P0488
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Perform the following repeatedly for 1 minute: gradually raise the engine speed to 3000 rpm from idling over approximately 10 seconds, and then release the accelerator pedal to return to an idling state.
Target and actual opening angle of the throttle valve differs for approximately 20 seconds.
(1 trip detection logic)
  1. Throttle valve stuck
  2. Throttle valve does not move smoothly
  3. Open or short in throttle control motor circuit
  4. ECM
The throttle motor activation duty exceeds the threshold for 0.5 seconds a certain number of times (40 seconds or more).
(1 trip detection logic)

Related Data List
DTC No.
Data List
P0488
  1. Throttle Motor Duty
  2. Actual Throttle Position

Reference
Condition
Throttle Valve Position
Moment when accelerator pedal is depressed further or released at 3000 rpm
Throttle valve opening angle varies smoothly

MONITOR DESCRIPTION

The ECM opens and closes the throttle valve by adjusting the current flowing to the rotary solenoid with a duty ratio. If the throttle valve does not move smoothly or is stuck, the duty ratio used during valve movement control increases or decreases greatly. The ECM will determine that the throttle valve is malfunctioning and illuminate the MIL.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance


WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  2. After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK05AX.html) and initialization (HILUX_TGN26 RM000000TIN058X.html).
HINT:
  1. Although the DTC title is Exhaust Gas Recirculation Throttle Position Control Range / Performance, these DTCs relate to the throttle valve
  2. 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.
1.PERFORM ACTIVE TEST USING GTS (DIESEL THROTTLE TARGET ANGLE)

  1. Connect the GTS to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine / Active Test / Diesel Throttle Target Angle.

  1. When changing the Active Test value to 0, 30, 60, 90, 60, 30 and 0% continuously, check that Actual Throttle Position smoothly changes to the set opening angle.

    OK:
    Value smoothly changes to set opening angle.


OK
Go to step 5
NG


2.CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR POWER SOURCE)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance

  1. Disconnect the throttle control motor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C15-2 (B) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Throttle Control Motor)

  1. Reconnect the throttle control motor connector.



NG
Go to step 10
OK


3.CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

  1. Disconnect the throttle control motor connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C15-3 (RSC) - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the throttle control motor connector.



NG
Go to step 11
OK


4.CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)

  1. Disconnect the throttle control motor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C15-1 (RSO) - C163-17 (LUSL)
    		Always
    		Below 1 Ω
    C15-1 (RSO) or C163-17 (LUSL) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the throttle control motor connector.

  1. Reconnect the ECM connector.



NG
Go to step 11
OK


5.REMOVE DEPOSIT (DIESEL THROTTLE BODY ASSEMBLY)

  1. Visually check for deposits in the diesel throttle body. If there are deposits, clean the diesel throttle body.


NEXT


6.PERFORM ACTIVE TEST USING GTS (DIESEL THROTTLE TARGET ANGLE)

  1. Connect the GTS to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine / Active Test / Diesel Throttle Target Angle.

  1. When changing the Active Test value to 0, 30, 60, 90, 60, 30 and 0% continuously, check that Actual Throttle Position smoothly changes to the set opening angle.

    OK:
    Value smoothly changes to set opening angle.


OK
Go to step 8
NG


7.REPLACE DIESEL THROTTLE BODY ASSEMBLY

  1. Replace the diesel throttle body assembly (HILUX_TGN26 RM0000013ZD01QX.html).


NEXT


8.CHECK WHETHER DTC OUTPUT RECURS

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK12TX.html).

  1. Connect the GTS to the DLC3.

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

  1. Start the engine.

  1. Over a period of 10 seconds or more, slowly raise the engine speed to 3000 rpm and lower it.

  1. Enter the following menus: Powertrain / Engine / Trouble Codes.

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P0488 is output
    		A
    No DTC is output
    		B


B
END
A


9.REPLACE ECM

  1. Replace the ECM (HILUX_TGN26 RM0000013Z001IX.html).



NEXT
Go to step 12

10.REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE CONTROL MOTOR - NO. 1 INTEGRATION RELAY)

  1. Repair or replace the harness or connector.



NEXT
Go to step 12

11.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


12.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK12TX.html).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. Over a period of 10 seconds or more, slowly raise the engine speed to 3000 rpm, and then lower it.

  1. Confirm that the DTC is not output again.

    HINT:
    Perform the following procedure using the GTS to determine whether or not the DTC judgment has been carried out.

    1. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

    2. Input DTC P0488.

    3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, over a period of 10 seconds or more, slowly raise the engine speed to 3000 rpm again, and then idle the engine for 5 minutes.


NEXT

END