Dtc P0505 Idle Control System Malfunction

Engine Hybrid System. Corolla. Zre142 Aze141
2Zr-Fe Engine Control. Corolla. Zre142 Aze141

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

INSPECTION PROCEDURE

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

CHECK PCV HOSE CONNECTIONS

CHECK INTAKE SYSTEM

INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE)

CHECK WHETHER DTC OUTPUT RECURS (DTC P0505)

DTC P0505 Idle Control System Malfunction


DESCRIPTION

The idle speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) the one valve type throttle body; 2) a throttle actuator, which operates the throttle valve; 3) a throttle position sensor, which detects the opening angle of the throttle valve; 4) an accelerator pedal position sensor, which detects the accelerator pedal position; and 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
Idling speed continues to vary greatly from target idling speed (2 trip detection logic)
  1. Electronic throttle control system
  2. Intake 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 either of the following conditions is met:
  1. 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.
  2. After driving at a vehicle speed of 6.25 mph (10 km/h) 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.

Corolla. Zre142 Aze141.2Zr-Fe Engine Control.Sfi System. Dtc P0505 Idle Control System Malfunction


MONITOR STRATEGY


Related DTCs
P0505: Idle speed control system functional 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
Once per driving cycle
Duration
10 minutes
MIL Operation
2 driving cycles
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Monitor runs whenever following DTCs not present
P0010 (VVT Oil Control Valve)
P0011 (VVT System - Advance)
P0012 (VVT System - Retard)
P0013 (Exhaust VVT Oil Control Valve)
P0014 (Exhaust VVT System - Advance)
P0015 (Exhaust VVT System - Retard)
P0016 (VVT System - Misalignment)
P0017 (Exhaust VVT System - Misalignment)
P0031, P0032 (Air Fuel Ratio Sensor Heater - Sensor 1)
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 Fuel Control)
P0171, P0172 (Fuel System)
P0301, P0302, P0303, P0304 (Misfire)
P0335 (Crankshaft Position Sensor)
P0340, P0342, P0343 (Camshaft Position Sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0365, P0367, P0368 (Exhaust Camshaft Position Sensor)
P0451, P0452, P0453 (EVAP System)
P0500 (Vehicle Speed Sensor)
P2195, P2196, P2237, P2238, P2239, P2252, P2253, P2A00 (Air Fuel Ratio Sensor - Sensor 1)
P219A (Air Fuel Ratio Imbalance)
Engine
Running

TYPICAL MALFUNCTION THRESHOLDS


Either condition is met
1 or 2
1. Both of 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 shift position is not neutral)
Less than -100 rpm, or more than 200 rpm (A/C on or shift position is neutral)
B. IAC flow rate learned value
0.5 L/sec. or less, or 11.15 L/sec. or more for 5 seconds or more
2. Both of following conditions C and D met
-
C. Frequency 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 shift position is not neutral)
Less than -100 rpm, or more than 200 rpm (A/C on or shift position is neutral)
(b) Vehicle condition
Stopped after vehicle was driven by 6.25 mph (10 km/h) or more
D. Either condition is met
(c) or (d)
(c) Amount of change of IAC flow rate learned value
+5.86 L/sec. or more, or -5.86 L/sec. or less
(d) IAC flow rate learned value
0.5 L/sec. or less, or 11.15 L/sec. or more

CONFIRMATION DRIVING PATTERN


Corolla. Zre142 Aze141.2Zr-Fe Engine Control.Sfi System. Dtc P0505 Idle Control System Malfunction

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation) (COROLLA_ZRE142 RM000000PDK0ZAX.html).
  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 higher with all the accessories switched off [B].
  7. Idle the engine for 5 minutes 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. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
  9. 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.
  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  11. Input the DTC: P0505.
  12. Check the DTC judgment result.

    Techstream 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 [E] and [F].
  13. Accelerate the vehicle to 6.25 mph (10 km/h) or more, and then idle the engine for 20 seconds or more [E].
    CAUTION:
    When performing the confirmation driving pattern, obey all speed limits and traffic laws.
  14. Repeat step [E] 5 times.
  15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].
  16. 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.
  17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  18. Input the DTC: P0505.
  19. Check the DTC judgment result.

    Techstream 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.
  20. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

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.
  2. 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
  3. Refer to "Data List / Active Test" [Engine Speed, ISC Feedback Value and ISC Learning Value] (Link).
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. Read the 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 (COROLLA_ZRE142 RM000000PDF0G8X.html)
A


2.CHECK PCV HOSE CONNECTIONS

  1. Check the PCV hose connections (COROLLA_ZRE142 RM0000012OO05EX_01_0003.html).

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


NG
REPAIR OR REPLACE PCV HOSE
OK


3.CHECK INTAKE SYSTEM

  1. Check the intake system for vacuum leaks (COROLLA_ZRE142 RM000003410016X.html).

    OK:
    No leaks from intake system.


NG
REPAIR OR REPLACE INTAKE SYSTEM
OK


4.INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE)

  1. Check the throttle valve condition.

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


NG
REPAIR OR REPLACE THROTTLE BODY ASSEMBLY (COROLLA_ZRE142 RM0000030MA016X.html)
OK


5.CHECK WHETHER DTC OUTPUT RECURS (DTC P0505)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Clear the DTCs.

  1. Turn the ignition switch off and wait for at least 30 seconds.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    DTC P0505 is output
    		A
    DTC is not output
    		B


B
END
A

REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)