Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Inspection procedure

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

  4. Check pcv hose connections

  5. Check air induction system

  6. Check throttle valve

DTC P0505 Idle Control System Malfunction


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DESCRIPTION

The idling speed is controlled by the Electronic Throttle Control System (ETCS). 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.

DTC No.
DTC Detection Conditions
Trouble Areas
P0505
Idle speed continues to vary greatly from target speed (2 trip detection logic)
  1. ETCS
  2. Air induction system
  3. PCV hose connections
  4. ECM

INSPECTION PROCEDURE

HINT:
  1. The following conditions may also cause DTC P0505 to be set:
    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.
  3. Read freeze frame data using an intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)

  1. Connect an intelligent tester to the DLC3.

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

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed To
    P0505
    		A
    P0505 and other DTCs
    		B
    HINT:
    If any DTCs other than P0505 are output, troubleshoot those DTCs first.


Bnext
GO TO DTC CHART (Click here)
A
next down

2.CHECK PCV HOSE CONNECTIONS
OK:
PCV hose is connected correctly and is not damaged.


NGnext
REPAIR OR REPLACE PCV HOSE
OK
next down

3.CHECK AIR INDUCTION SYSTEM

  1. Check the air induction system for vacuum leakage.

    OK:
    No leakage from air induction system.


NGnext
REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK
next down

4.CHECK THROTTLE VALVE

  1. Check the throttle valve condition.

    OK:
    Throttle valve is not contaminated with foreign objects and moves smoothly.


NGnext
REPLACE THROTTLE BODY ASSEMBLY (Click here)
OK
next down
REPLACE ECM (Click here)