Toyota RAV4 manuals

Toyota Sienna Service Manual: Idle Control System Malfunction

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.

Idle Control System Malfunction

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:

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

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

HINT:

(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.

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

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position.

(c) Turn the tester on.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(e) Read the DTCs.

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

(a) Check the intake system for vacuum leakage.

OK: No leakage from intake system.

4 CHECK THROTTLE VALVE

(a) Check the throttle valve condition.

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

REPLACE ECM (See page ES-498)

Brake Switch
DESCRIPTION The stop light switch is a duplex system that transmits two signals: STP and ST1-. These two signals are used by the ECM to monitor whether or not the brake system is working prope ...

Cold Start Idle Air Control System Performance
DESCRIPTION This monitor will run when the engine is started at -10 to 50°C (14 to 122°F) of the engine coolant temperature. The DTC will set after the engine idling for 13 seconds (2 trip ...

Other materials:

Installation
1. INSTALL CIGARETTE LIGHTER ASSEMBLY  Engage the 2 claws to install the cigarette lighter assembly.  Install the cigarette lighter knob. 2. INSTALL CIGARETTE LIGHTER COVER  Engage the 2 claws to install the cigarette lighter cover. 3. INSTALL INSTRUMENT CL ...

Transmission Range Sensor Circuit Malfunction (PRNDL Input)
DESCRIPTION The park/neutral position switch detects the shift lever position and sends signals to the ECM. MONITOR DESCRIPTION These DTCs indicate a problem with the park/neutral position switch and the wire harness in the park/ neutral position switch circuit. The park/neutral po ...

Removal
NOTICE:  Always wear safety gloves because the edges of the seatback frame and seat adjuster are sharp and may cause injury.  Work must be started more than 90 seconds after the ignition switch is turned to the LOCK position and the negative (-) terminal cable is disconnected ...

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