Toyota RAV4 manuals

Toyota RAV4 Service Manual: Idle control system malfunction

Toyota RAV4. 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.

Toyota RAV4. 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 apply:

Example: if the actual idling speed varies from the target idling speed by more than 200 rpm* 5 times during a drive cycle, the ecm illuminates the mil and sets the dtc.

Hint:

*: Threshold idling speed varies with engine load.

Toyota RAV4. Monitor description


Monitor strategy

Toyota RAV4. Monitor strategy


Typical enabling conditions

Toyota RAV4. Typical enabling conditions


Typical malfunction thresholds

Toyota RAV4. Typical malfunction thresholds


Toyota RAV4. Typical malfunction thresholds


Inspection procedure

Hint:

  1. 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.
  2. The accelerator pedal being not fully released.
  1. Check any other dtcs output (in addition to dtc p0505)

  1. Connect the intelligent tester to the dlc3.
  2. Turn the ignition switch on.
  3. Turn the tester on.
  4. Select the following the menu items: diagnosis / enhanced obd ii / dtc info / current codes.
  5. Read dtcs.

Toyota RAV4. Check any other dtcs output (in addition to dtc p0505)


Hint:

If any dtcs other than p0505 are output, troubleshoot those dtcs first.



  1. Check pcv hose connections

Ok: pcv hose is connected correctly and is not damaged.



  1. Check air induction system

  1. Check the air induction system for vacuum leakage.

Ok: no leakage from air induction system.



  1. Check throttle valve

  1. Check the throttle valve condition.

Ok: throttle valve is not contamainated with foreign objects and moves smoothly.

 


Brake switch "A" / "B" correlation
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
Description The electronic throttle control system (etcs) controls the engine idling speed. The etcs operates the throttle actuator to open and close the throttle valve, and adjusts the intake ...

Other materials:

Intake air temperature sensor gradient too high
Description The intake air temperature (iat) sensor, mounted on the mass air flow (maf) meter, monitors the iat. The iat sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the iat is low, the resistance of the thermist ...

System description
Description The eps (electronic power steering) system generates torque through the operation of the motor and the reduction gear installed on the column shaft in order to assist steering effort. The power steering ecu determines directions and the amount of assisting power in accordanc ...

Starter relay
On-vehicle inspection Disconnect cable from negative battery terminal Caution: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. Remove starter relay Remove the starter relay fr ...

В© 2011-2021 Copyright www.trav4.net