Dtc P0505 Idle Control System Malfunction

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

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 WITH MOTOR BODY ASSEMBLY (THROTTLE VALVE)

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) 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 Condition
Trouble Area
P0505
Idling speed continues to vary greatly from target idling speed (2 trip detection logic)
  1. ETCS
  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 the following conditions apply:
  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 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 has been changed by an amount that exceeds the threshold.

Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0505 Idle Control System Malfunction


MONITOR STRATEGY


Related DTCs
P0505: ISC function
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
Duration
10 minutes
MIL Operation
2 driving cycles
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


Monitor runs whenever following DTCs not present
P0010 (VVT OCV)
P0011 (VVT system 1 - advance)
P0012 (VVT system 1 - retard)
P0016 (VVT system 1 - misalignment)
P0031, P0032 (A/F sensor heater)
P0100, P0102, P0103 (MAF meter)
P0115, P0117, P0118 (ECT sensor)
P0120 - P0123, P0220, P0222, P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0171, P0172 (Fuel system)
P0301 - P0304 (Misfire)
P0335 (CKP sensor)
P0340 (CMP sensor)
P0351 - P0354 (Ignitor)
P0450 - P0453 (EVAP system)
P0500 (VSS)
P0705 (Shift position switch)
P0973, P0974, P0976, P0977 (Shift solenoid)
P2195, P2196 (A/F sensor)
P2237 - P2239, P2252, P2253 (A/F sensor)
P2A00 (A/F sensor)
Engine
Running

TYPICAL MALFUNCTION THRESHOLDS


Either of following conditions 1 or 2 met
-
1. Both of following conditions (a) and (b) met
-
(a) Engine rpm - Target engine rpm
Less than -100 rpm, or more than 150 rpm (A/C OFF and shift position not neutral)
Less than -100 rpm, or more than 200 rpm (A/C ON or shift position neutral)
(b) IAC flow rate learning value
0.5 L/sec or less, or 4.5 L/sec or more for 5 seconds
2. Both of following conditions (c) and (d) met
-
(c) Frequency that both of following conditions (1) and (2) met
5 times or more
(1) Engine rpm - Target engine rpm
Less than -100 rpm, or more than 150 rpm (A/C OFF and shift position not neutral)
Less than -100 rpm, or more than 200 rpm (A/C ON or shift position neutral)
(2) Vehicle conditions
Stop after vehicle was driven at 10 km/h (6.25 mph) or more
(d) Amount of change of IAC flow rate learning value
+2.01 L/sec or more, or -2.53 L/sec or less

CONFIRMATION DRIVING PATTERN


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). 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 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 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 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].
  14. Repeat step [E] 5 times.
  15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].
  16. Read pending DTCs.
    CAUTION:
    When performing the confirmation driving pattern, obey all speed limits and traffic laws.
    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 (YARIS_NCP93 RM000000PDK0QGX.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 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 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.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)

  1. Connect a 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
    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 (YARIS_NCP93 RM000000PDF0E6X.html)
A


2.CHECK PCV HOSE CONNECTIONS

  1. Check the PCV hose connections (YARIS_NCP93 RM000001L6B007X.html).

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


NG
REPAIR OR REPLACE PCV HOSE
OK


3.CHECK INTAKE SYSTEM

  1. Check the intake system for vacuum leak.

    OK:
    No leak from intake system.


NG
REPAIR OR REPLACE INTAKE SYSTEM
OK


4.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (THROTTLE VALVE)

  1. Check the throttle valve condition.

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


NG
REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY (YARIS_NCP93 RM000001CZA012X.html)
OK


5.CONFIRM WHETHER DTC OUTPUT RECURS

  1. Connect a Techstream to the DLC3.

  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. Read DTCs.

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


B
END
A

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)