Toyota Tundra. Manual — part 1580
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STOP LIGHT
SWITCH)
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 DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART
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:
The learned idling air flow volume remains at the maximum or minimum volume for 5 seconds during a
drive cycle.
While driving at 10 km/h (6.25 mph) or more, the actual engine idling speed varies from the target idling
speed by between 100 RPM and 150 RPM, 5 times or more during a drive cycle.
Example:
If the actual idling speed varies from the target idling speed by more than 150 RPM* 5 times during a drive
cycle, the ECM illuminates the MIL and stores the DTC.
HINT:
*: Threshold idling speed varies with engine load.
DTC
DTC Detection Condition
Trouble Area
P0505
Idling speed continues to vary
greatly from target idling speed (2
trip detection logic)
ETCS
Air induction system
PCV hose connections
ECM
2009 Toyota Tundra
2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
Fig. 193: Example Of Idling Speed And Idling Air Flow Volume
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR STRATEGY
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
2009 Toyota Tundra
2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
TYPICAL ENABLING CONDITIONS
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
TYPICAL MALFUNCTION THRESHOLDS CONDITIONS
MIL Operation
2 driving cycles
Sequence of Operation
None
Monitor runs whenever
following DTCs not present
P0010, P0020 (VVT Oil Control Valve)
P0011, P0021 (VVT System - Advance)
P0012, P0022 (VVT System - Retard)
P0016, P0018 (VVT System - Misalignment)
P0013, P0023 (Exhaust VVT Oil Control Valve)
P0014, P0024 (Exhaust VVT System - Advance)
P0015, P0025 (Exhaust VVT System - Retard)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0031, P0032, P0051, P0052 (Air Fuel Ratio Sensor Heater)
P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241, P2242,
P2252, P2253, P2255, P2256, P2A00, P2A03 (Air Fuel Ratio Sensor)
P0102, P0103 (Mass Air Flow Sensor)
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, P0174, P0175 (Fuel System)
P0301 - P0308 (Misfire)
P0335 (Crankshaft Position Sensor) P1340 (Camshaft Position Sensor)
P0340, P0342, P0343, P0345, P0347, P0348 (VVT Sensor)
P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT Sensor)
P0351 - P0358 (Igniter)
P0451, P0452, P0453 (EVAP System)
P0500 (Vehicle Speed Sensor)
P0705 (Shift Lever Position Switch)
P0748, P0778 (Pressure Control Solenoid)
P0973, P0974, P0976, P0977, P0979, P0980, P0982, P0983, P0985, P0986
(Shift Solenoid)
Engine
Running
Either of following conditions 1 or 2 met
-
1. Frequency that both of following conditions (a)
and (b) set
5 times or more
(a) Engine speed - Target engine speed
Less than -100 RPM, or more than 150 RPM
(b) Vehicle condition
Stop after vehicle was driven at 10 km/h (6.25 mph)
or more
2. Frequency that both of following conditions (c)
Once
2009 Toyota Tundra
2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
INSPECTION PROCEDURE
HINT:
The following conditions may also cause DTC P0505 to be set:
a. 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.
b. The accelerator pedal being not fully released.
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. 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)
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 and ECT/Trouble Codes.
e. Read DTCs.
Result
DTC OUTPUT RESULT
HINT:
If any DTCs other than P0505 are output, troubleshoot those DTCs first.
B: GO TO DTC CHART
A: Go to Next Step
2. CHECK PCV HOSE CONNECTIONS
a. Check the PCV hose connections (see ON-VEHICLE INSPECTION ).
OK:
and (d) set
(c) Engine speed - Target engine speed
Less than -100 RPM, or more than 150 RPM
(d) IAC flow rate learning value
2.48 L/sec. or less, or 11.0 L/sec. or more
Result
Proceed to
P0505 is output
A
P0505 and other DTCs are output
B
2009 Toyota Tundra
2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra
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