Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0448)

CHECK IF DTC OUTPUT RECURS (DTC P0448 OUTPUT)

CHECK ECM (LUSL SIGNAL)

CHECK WIRE HARNESS (THROTTLE CONTROL MOTOR - ECM)

DTC P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance


DESCRIPTION

The ECM opens and closes the throttle valve using the rotary solenoid type actuator. The exhaust gas recirculation volume is controlled by opening and closing the valve. Also, engine vibration and noise is reduced by closing the valve when the engine is stopped.

DTC No.
DTC Detection Condition
Trouble Area
P0488
When either condition below is met:
  1. Throttle valve remains closed despite ECM's signal to open valve
    (1 trip detection logic)
  2. Throttle valve remains open despite ECM's signal to close valve
    (1 trip detection logic)
  1. Throttle valve stuck
  2. Throttle valve does not move smoothly
  3. Open or short in throttle valve circuit
  4. Open or short in throttle valve position sensor circuit
  5. Throttle position sensor (built in diesel throttle body assembly)
  6. ECM
HINT:
After confirming DTC P0488, check the throttle position.

Reference:

Condition
Throttle Valve Position
Moment when accelerator pedal is further depressed or released at 2,500 rpm
Opening angle varies smoothly

MONITOR DESCRIPTION

The ECM opens and closes the throttle valve by adjusting the duration of current flowing to the rotary solenoid (duty ratio). If the throttle valve does not move smoothly or is stuck, the duty ratio during the valve movement control increases or decreases greatly, the ECM will determine that the throttle valve has a malfunction and illuminates the MIL.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance


WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance


INSPECTION PROCEDURE

HINT:
  1. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.
  2. After warming up the engine, DTC P0488 is set 1 second or more after quickly accelerating the engine from idling.
NOTICE:
If the ECM is replaced, the new ECM needs initialization (Toyota Fortuner RM000000TIN04NX.html).
1.CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0448)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

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

  1. Read the DTCs (Toyota Fortuner RM0000012WY00RX.html).

    Result:
    Display (DTC Output)
    		Proceed to
    P0488
    		A
    P0488 and P0122 and/or P0123
    		B
    HINT:
    If any other codes besides P0488 are output, perform troubleshooting for those DTCs first.


B
GO TO RELEVANT DTC CHART
A


2.CHECK IF DTC OUTPUT RECURS (DTC P0448 OUTPUT)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

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

  1. Clear the DTCs (Toyota Fortuner RM0000012WY00RX.html).

  1. Start the engine and perform a quick engine acceleration from idling to 3,000 rpm 3 times.

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

  1. Read the DTCs (Toyota Fortuner RM0000012WY00RX.html).

    Result:
    Display (DTC output)
    		Proceed to
    P0488
    		A
    No output
    		B
    HINT:
    The normal operation of the throttle valve is as follows.
    Reference:
    Condition
    		Throttle Position
    Moment when accelerator pedal is further depressed or released at 3,000 rpm
    		Opening angle varies smoothly


B
CHECK FOR INTERMITTENT PROBLEMS
A


3.CHECK ECM (LUSL SIGNAL)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance

  1. While revving the engine, check the waveform of the ECM connector using an oscilloscope.

    OK:
    Tester Connection
    		Specified Condition
    E6-4 (LUSL) - E6-7 (E1)
    		Correct waveform is as shown
    Tool Setting
    		Condition
    1 V/DIV., 2 msec./DIV.
    		Racing engine with warm engine
HINT:
The waveform varies depending on the diesel throttle signal operation.


NG
REPLACE ECM
OK


4.CHECK WIRE HARNESS (THROTTLE CONTROL MOTOR - ECM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P0488 Exhaust Gas Recirculation Throttle Position Control Range / Performance

  1. Disconnect the T2 motor connector.

  1. Disconnect the E6 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    T2-1 (RSO) - E6-4 (LUSL)
    		Below 1 Ω
    T2-1 (RSO) or E6-4 (LUSL) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE DIESEL THROTTLE BODY ASSEMBLY