Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VICH
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: P0505; Idle Control System; 2016 MY Sienna [12/2015 - 08/2016]

DTC

P0505

Idle Control System

DESCRIPTION

The idle speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) one valve type throttle body with motor assembly; 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; 5) the ECM, which controls the electronic throttle control system. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

DTC No.

DTC Detection Condition

Trouble Area

P0505

Idle speed continues to vary greatly from target speed (2 trip detection logic).
  • Electronic throttle control system
  • Intake system
  • PCV hose connection
  • 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 either of the following conditions is met:

  • The difference between the target engine idling speed and actual engine idling speed exceeds the threshold and the IAC flow rate learned value is stuck at the upper or lower limit for 5 seconds or more.
  • After driving at a vehicle speed of 10 km/h (6.25 mph) or more, the difference between the target and actual engine idle 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.

MONITOR STRATEGY

Related DTCs

P0505: Idle air control system function check

Required Sensors / Components (Main)

Electronic throttle control system

Required Sensors / Components (Related)

Crankshaft position sensor

Engine coolant temperature sensor

Vehicle speed sensor

Frequency of Operation

Continuous

Duration

5 seconds (Idling after warming up)

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs are not present

P0010, P0020 (Camshaft timing oil control valve assembly bank 1, 2)

P0011, P0021 (VVT system bank 1, 2 - advance)

P0012, P0022 (VVT system bank 1, 2 - retard)

P0013, P0023 (Exhaust camshaft timing oil control valve assembly bank 1, 2)

P0014, P0024 (Exhaust VVT system bank 1, 2 - advance)

P0015, P0025 (Exhaust VVT system bank 1, 2 - retard)

P0016, P0018 (VVT system bank 1, 2 - misalignment)

P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment)

P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)

P0102, P0103 (Mass air flow meter)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient engine coolant temperature for closed loop)

P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256 (Air fuel ratio sensor)

P0171, P0172, P0174, P0175 (Fuel system)

P0300, P0301, P0302, P0303, P0304, P0305, P0306 (Misfire)

P0335 (Crankshaft position sensor)

P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)

P0351, P0352, P0353, P0354, P0355, P0356 (Igniter)

P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)

P0451, P0452, P0453 (Evaporative emission control system)

P0500 (Vehicle speed sensor)

P0705 (Shift lever control switch)

P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1 (Air fuel ratio imbalance)

Engine

Running

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met:

Condition 1 or 2

1. Frequency that both of the following conditions A and B met

-

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. IAC flow rate learned value

0.88 L/sec. or less, or 8.5 L/sec. or more for 5 seconds or more

2. Frequency that both of the following conditions C and D met

-

C. Either of the following conditions (a) and (b) are 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

Stop after vehicle was driven by 10 km/h (6.25 mph) or more

D. Either of the following conditions is met

Condition (c) or (d)

(c). Amount of change of IAC flow rate learned value

+4.04 L/sec. or more, or -7.52 L/sec. or less

(d). IAC flow rate learned value

0.88 L/sec. or less, or 8.5 L/sec. or more

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR ).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on [A].
  6. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or more) with all the accessories switched off [B].
  7. Idle the engine for 5 minutes or more [C].
  8. Accelerate the vehicle to 10 km/h (6.25 mph) or more, and then idle the engine.

    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.

  9. Enter the following menus: Powertrain / Engine / Trouble Codes.
  10. Read pending DTCs [D].

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Input the DTC: P0505.
  13. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    HINT:

    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform steps [E] and [F].
  14. Accelerate the vehicle to 6.25 mph (10 km/h) or more, and then idle the engine for 20 seconds or more [E].
  15. Repeat step [E] 5 times.
  16. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
  17. Read the pending DTCs [F].

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  18. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  19. Input the DTC: P0505.
  20. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
  21. If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

CAUTION / NOTICE / HINT

HINT:

  • The following conditions may also cause DTC P0505 to be stored:
    1. The floor carpet overlapping 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.
  • Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.
  • Refer to "Data List / Active Test" [Engine Speed, ISC Feedback Value and ISC Learning Value] (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST ).

PROCEDURE

1.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read DTCs.

Result

Result

Proceed to

DTC P0505 is output

A

DTC 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

A

2.

CHECK PCV HOSE (HOSE CONNECTIONS)

(a) Check the PCV hose connections (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE EMISSION CONTROL: PCV VALVE: COMPONENTS ).

OK:

PCV valve and hose are connected correctly and are not damaged.

NG

REPAIR OR REPLACE PCV HOSE
OK

3.

CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leaks (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE INTAKE / EXHAUST: INTAKE SYSTEM: ON-VEHICLE INSPECTION ).

OK:

No leaks in intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION ).

NG

REPAIR OR REPLACE INTAKE SYSTEM
OK

4.

CHECK THROTTLE BODY WITH MOTOR ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

(a) Check for contamination between the throttle valve and the housing, and check that the throttle valve moves smoothly.

OK:

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

HINT:

Perform "Inspection After Repair" after repairing the throttle body with motor assembly (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION ).

NG

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

OK

5.

CONFIRM WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(e) Read DTCs.

Result

Result

Proceed to

DTC P0505 is output

A

No DTC is output

B
A

REPLACE ECM

B

END