Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131
TYPICAL MALFUNCTION THRESHOLDS
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)
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 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). |
|
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 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.
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 (Idling after warm up) |
| MIL Operation | 2 driving cycles |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Monitor runs whenever following DTCs not present | P0010 (Camshaft Timing Oil Control Valve) P0011 (VVT System - Advance) P0012 (VVT System - Retard) P0016 (VVT System - Misalignment) P0031, P0032, P101D (Air Fuel Ratio Sensor Heater) P2195, P2196, P2237, P2238, P2239, P2252, P2253, P014C, P014D, P015A, P015B (Air Fuel Ratio Sensor) P0102, P0103 (Mass Air Flow Meter) P0115, P0117, P0118 (Engine Coolant Temperature Sensor) P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle Position Sensor) P0171, P0172 (Fuel System) P0301 - P0304 (Misfire) P0335 (Crankshaft Position Sensor) P0340 (Camshaft Position Sensor) P0351 - P0354 (Igniter) P0451, P0452, P0453 (EVAP System) P0500 (Vehicle Speed Sensor) P0705 (Shift Lever Position Switch) P0973, P0974, P0976, P0977 (Shift Solenoid Valve) 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 NSW off) Less than -100 rpm, or more than 200 rpm (A/C on or NSW on) |
| B. IAC flow rate learned value | 0.55 L/sec. or less, or 4.5 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 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 |
| D. Amount of change of IAC flow rate learned value | +2.01 L/sec. or more, or -2.53 L/sec. or less |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on [A].
- 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].
- 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.
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
- Read pending DTCs.
- HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P0505.
- 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 memory limit
- HINT:
- If the judgment result shows NORMAL, the system is normal.
- 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].
- DTC judgment completed
- Accelerate the vehicle to 10 km/h (6.25 mph) or more, and then idle the engine for 20 seconds or more [E].
- Repeat step [E] 5 times.
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].
- Read pending DTCs.
- CAUTION:
- When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P0505.
- 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 memory limit
- HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- DTC judgment completed
- 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 RM000000PDK0T5X.html).
- HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
INSPECTION PROCEDURE
- HINT:
- The following conditions may also cause DTC P0505 to be stored:
- 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.
- 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] (YARIS_NCP93 RM000000SXS05AX.html).
| 1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
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.
|
| ||||
| A | |
| 2.CHECK PCV HOSE CONNECTIONS |
Check the PCV hose connections (YARIS_NCP93 RM000001RN103YX.html).
- OK:
- PCV valve and hose are connected correctly and are not damaged.
|
| ||||
| OK | |
| 3.CHECK INTAKE SYSTEM |
Check the intake system for vacuum leaks (YARIS_NCP93 RM000004VL8003X.html).
- OK:
- No leaks from the intake system.
- HINT:
- Perform "Inspection After Repair" after repairing or replacing the intake system (YARIS_NCP93 RM000004NJD006X.html).
|
| ||||
| OK | |
| 4.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (THROTTLE VALVE) |
Check the throttle with motor body assembly condition.
- OK:
- Throttle valve is not contaminated with foreign objects and moves smoothly.
- HINT:
- Perform "Inspection After Repair" after replacing the throttle with motor body assembly (YARIS_NCP93 RM000004NJD006X.html).
|
| ||||
| OK | |
| 5.CONFIRM WHETHER DTC OUTPUT RECURS |
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Clear the DTCs.
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the Techstream on.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read DTCs.
Result Result Proceed to DTC P0505 is output A No DTC is output B
|
| ||||
| A | ||
| ||