Dtc P0505 Idle Control System Malfunction

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

INSPECTION PROCEDURE

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

CHECK PCV HOSE CONNECTIONS

CHECK AIR INDUCTION SYSTEM

INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY

CONFIRM WHETHER DTC OUTPUT RECURS

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) a one-valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position 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 Condition
Trouble Area
P0505
Idling speed continues to vary greatly from the target idling speed (2 trip detection logic).
  1. ETCS
  2. Air induction system
  3. PCV hose connections
  4. ECM

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 condition is met:
  1. After driving at a vehicle speed of 10 km/h (6.25 mph) or more, the difference between the target and actual engine idling speed exceeds the threshold 5 times or more during a driving cycle, and then the system determines that the IAC flow rate learned value is stuck at the upper or lower limit, or that the IAC flow rate learned value has been changed by an amount that exceeds the threshold.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fe Engine Control.Sfi System (W/ Secondary Air Injection System). Dtc P0505 Idle Control System Malfunction


MONITOR STRATEGY


Required Sensors/Components (Main)
ETCS
Required Sensors/Components (Related)
Crankshaft position sensor, Engine coolant temperature sensor, and Vehicle speed sensor
Frequency of Operation
Once per driving cycle
MIL Operation
2 driving cycles

TYPICAL MALFUNCTION THRESHOLDS


Both of following conditions A and B met
-
A. Number of times that both of following conditions (a) and (b) met
5 times or more
(a) Engine speed - Target engine speed
Less than -100 rpm, or more than 150 rpm (A/C off and NSW off)
Less than -100 rpm, or more than 200 rpm (A/C on or NSW on)
(b) Vehicle condition
Stopped after being driven at 10 km/h (6.25 mph) or more
B. Either condition is met
(c) or (d)
(c) IAC flow rate learned value
Lower limit or upper limit
(d) Amount of change of IAC flow rate learned value exceeds threshold
-

CONFIRMATION DRIVING PATTERN


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fe Engine Control.Sfi System (W/ Secondary Air Injection System). Dtc P0505 Idle Control System Malfunction

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON and turn the intelligent tester on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the intelligent tester on [A].
  6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off [B].
  7. Idle the engine for 1 minute or more [C].
    HINT:
    In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.
  8. Accelerate the vehicle to 10 km/h (6.25 mph) or more, and then idle the engine for 20 seconds or more [D].
    CAUTION:
    When performing the confirmation driving pattern, obey all speed limits and traffic laws.
  9. Repeat step [D] 5 times.
  10. Enter the following menus: Powertrain / Engine and ECT / DTC [E].
  11. Read the pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  13. Input the DTC: P0505.
  14. Check the DTC judgment result.

    Intelligent tester Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E] again.

INSPECTION PROCEDURE

HINT:
  1. The following conditions may also cause DTC P0505 to be stored:
    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.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.
  3. Refer to "Data List / Active Test" [Engine Speed] (HILUX_TGN26 RM000000SXS08OX.html).
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P0505 is output
    		A
    P0505 and other DTCs are output
    		B
    HINT:
    If any DTCs other than P0505 are output, troubleshoot those DTCs first.


B
GO TO DTC CHART (HILUX_TGN26 RM0000032SF041X.html)
A


2.CHECK PCV HOSE CONNECTIONS

  1. Check the PCV hose connections (HILUX_TGN26 RM000001I6600NX_01_0001.html).

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


NG
REPAIR OR REPLACE PCV HOSE (HILUX_TGN26 RM00000141N00YX.html)
OK


3.CHECK AIR INDUCTION SYSTEM

  1. Check the air induction system for vacuum leaks (HILUX_TGN26 RM000001A3W024X_01_0008.html).

    OK:
    No leaks in air induction system.


NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM (HILUX_TGN26 RM000000YMS024X.html)
OK


4.INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY

  1. Check for contamination between the throttle valve and housing, and check that the throttle valve moves smoothly.

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


NG
REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY (HILUX_TGN26 RM000000VWO01XX.html)
OK


5.CONFIRM WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P0505 is output
    		A
    No DTC is output
    		B


B
END
A

REPLACE ECM (HILUX_TGN26 RM000000VW202TX.html)