Toyota Sienna Quiz
2GR-FE Engine control system

Idle Control System Malfunction

In this manual: 2GR-FE Engine control system
Introduction — 55Service specifications — 7Maintenance — 7Engine — 264U151e automatic transaxle — 108Transfer — 19Propeller shaft — 8Drive shaft — 14Differential — 16Axle — 18Suspension — 37Tire and wheel — 54Brake control — 141Parking brake — 16Steering Column — 11Power steering — 18Air conditioning — 106Supplemental restraint system — 146Seat belt — 22Theft deterrent — 14Engine immobiliser — 17Cruise control — 65Lighting — 61Wiper and washer — 13Door lock — 42Meter — 28Audio / visual — 94Navigation — 108Park assist / monitoring — 33Horn — 5Garage door opener — 42GR-FE Engine control system — 126Supplemental restraint system — 147Other system — 14Windshield / windowglass — 43Mirror — 23Instrument panel — 6Seat belt — 22Seat — 92Engine hood / door — 104Exterior — 39Interior — 5Sliding roof — 9Multiplex communication — 18Can communication — 23
5steps
~30min
2/5difficulty
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DTC P0505 Idle Control System Malfunction

DESCRIPTION

The idling speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS is comprised of: 1) the one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the Throttle Position (TP) sensor, which detects the opening angle of the throttle valve; 4) the Accelerator Pedal Position (APP) sensor, which detects the accelerator pedal position; and 5) the ECM, which controls the ETCS.

Based on the target idling speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

DESCRIPTION

MONITOR DESCRIPTION

The ECM monitors the idling speed and idling air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC system is malfunctioning if the following conditions are met:

  • The learned idling air flow volume remains at the maximum or minimum volume 5 times or more in a drive cycle.
  • While driving at 10 km/h or more, the actual engine idling speed varies from the target idling speed by between 100 rpm and 200 rpm, 5 times or more in a drive cycle.

Example: If the actual idling speed varies from the target idling speed by more than 200 rpm* 5 times in a drive cycle, the ECM illuminates the MIL and sets the DTC.

*: Threshold idling speed varies according to the engine load.

MONITOR DESCRIPTION

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

HINT:

  • The following conditions may also cause DTC P0505 to be set: (a)The floor carpet overlapping slightly onto the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open.
(b)The accelerator pedal being not fully released.
  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

    • 1 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)

    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Turn the tester on.
    4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    5. Read the DTCs.

    Result

    Result

    HINT: If any DTCs other than P0505 are output, troubleshoot those DTCs first.

    2 CHECK PCV HOSE CONNECTIONS

    OK: PCV hose is connected correctly and is not damaged.

    3 CHECK INTAKE SYSTEM

    1. Check the intake system for vacuum leakage.

    OK: No leakage from intake system.

    4 CHECK THROTTLE VALVE

    1. Check the throttle valve condition.

    OK: No foreign objects between the throttle valve and housing.

    REPLACE ECM

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