Dtc P0505 Idle Control System Malfunction

Engine Hybrid System. Corolla. Zre142 Aze141
2Az-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 (THROTTLE VALVE)

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) a 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
Idle speed continues to vary greatly from target idle 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 Aze141.2Az-Fe Engine Control.Sfi System. Dtc P0505 Idle Control System Malfunction


MONITOR STRATEGY


Related DTCs
P0505: Idle speed control function
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 are not present
P0010 (VVT Oil Control Valve)
P0011 (VVT System - Advance)
P0012 (VVT System - Retard)
P0016 (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)
P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air Fuel Ratio Sensor - Sensor 1)
P0171, P0172 (Fuel System)
P0301, P0302, P0303, P0304 (Misfire)
P0335 (Crankshaft Position Sensor)
P0340 (Camshaft Position Sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0451, P0452, P0453 (EVAP System)
P0500 (Vehicle Speed Sensor)
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
1.1 L/sec. or less, or 6 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 being driven at 6.25 mph (10 km/h) or more
D. Amount of change of IAC flow rate learning value
+2.46 L/sec. or more or -2.46 L/sec. or less

CONFIRMATION DRIVING PATTERN


Corolla. Zre142 Aze141.2Az-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 procedure).
  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 10 km/h (6.25 mph) 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 RM000000PDK0ZBX.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.
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 DTCs.

    Result:

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


B
GO TO DTC CHART (COROLLA_ZRE142 RM000000PDF0G9X.html)
A


2.CHECK PCV HOSE CONNECTIONS

  1. Check PCV hose.

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 RM00000341100ZX.html).

    OK:
    No leak in intake system.


NG
REPAIR OR REPLACE INTAKE SYSTEM
OK


4.INSPECT THROTTLE BODY (THROTTLE VALVE)

  1. Check the throttle valve condition.

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


NG
REPLACE THROTTLE BODY (COROLLA_ZRE142 RM0000017UC03CX.html)
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)