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DI-266
DIAGNOSTICS - ENGINE (1GR-FE)
DIDTU-01
DTC P0505 Idle Air Control System
CIRCUIT DESCRIPTION
The idle speed is controlled by the ETCS (Electronic Throttle Control System).
The ETCS is composed of the throttle motor which operates the throttle valve, and the throttle position sen-
sor, which detects the opening angle of the throttle valve.
The ECM controls the throttle motor to provide the proper throttle valve opening angle to obtain the target
idle speed.
DTC No. DTC Detection Condition Trouble Area
S ETCS
Idle speed continues to vary greatly from target speed S Air induction system
P0505
(2 trip detection logic) S PCV hose connection
S ECM
MONITOR DESCRIPTION
The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. The ECM con-
cludes that the idle speed control ECM function is malfunctioning if: 1) the actual idle RPM varies more than
the specified amount, or 2) a learning value of the idle speed control remains at the maximum or minimum
five times or more during a driving cycle. The ECM will turn on the MIL and set a DTC.
Example:
If the actual idle RPM varies from the target idle RPM by more than 100 (*1) rpm five times during a driving
cycle, the ECM will turn on the MIL and a DTC is set.
HINT:
*1: RPM threshold varies with engine load.
Large
Target RPM Maximum
Idle engine Learned value
RPM of the idle speed
control
0
Actual idle RPM Minimum
Small
Time Time
A20823
DI-267
DIAGNOSTICS - ENGINE (1GR-FE)
MONITOR STRATEGY
Related DTCs P0505 Idle air control malfunction
Main sensors/components Crankshaft position sensor
Required sensors/components Vehicle speed sensor, Engine coolant tempera-
Related sensors/components
ture sensor
Frequency of operation Once per driving cycle
Duration 10 min.
MIL operation 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-18
not present
Engine Running
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
Either of the following conditions is met: Condition 1 or 2
1. Frequency that both of the following conditions (a) and (b)
5 times or more
are met:
(a) Engine RPM - target engine RPM Less than -100 rpm or more than 150 rpm
(b) Vehicle condition Stop after vehicle was driven by 6.25 mph (10 km/h) or more
2. Frequency that both of the following conditions (c) and (d)
Once
are met:
(c) Engine RPM - target engine RPM Less than -100 rpm or more than 150 rpm
(d) Intake air control flow rate learning value 1.3 L/sec. or less, or 8.5 L/sec. or more
DI-268
DIAGNOSTICS - ENGINE (1GR-FE)
INSPECTION PROCEDURE
HINT:
S When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a
floor carpet is overlapped on the accelerator pedal, or if the accelerator pedal is not fully released, etc.,
DTC P0505 will possibly be detected.
S Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or
rich, as well as other data from the time when a malfunction occurred.
1 Are there any other codes (besides P0505) being output?
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON and push the hand-held tester main switch ON.
(c) When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester.
RESULT:
Display (DTC Output) Proceed to
P0505 A
"P0505" and other DTCs B
HINT:
If any other codes besides P0505 are output, perform the troubleshooting for those DTCs first.
B Go to DTC chart (See page DI-57).
A
2 Check connection of PCV hose.
NG Repair or replace PCV hose.
OK
DI-269
DIAGNOSTICS - ENGINE (1GR-FE)
3 Check air induction system (See page SF-1).
CHECK:
Check for vacuum leaks in air induction system.
OK:
No leakage.
NG Repair or replace air induction system.
OK
Check electric throttle control system
(See page SF-39).
DI-269-1
DIAGNOSTICS - ENGINE (1GR-FE)
DTC P050A Cold Start Idle Air Control System
Performance
DTC P050B Cold Start Ignition Timing Performance
DESCRIPTION
The Electronic Throttle Control System (ETCS) controls the engine idling speed. The ETCS operates the
throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target
idling speed.
In addition, the ECM retards the ignition timing and the ETCS increases the intake air amount to quickly
increase the catalyst temperature at cold start.
DTC No. DTC Detection Conditions Trouble Areas
S Throttle body assembly
S Mass air flow meter
Accumulated intake air amount during 10 seconds of idling
P050A S Air induction system
after cold start, less than threshold (2 trip detection logic)
S PCV hose connections
S ECM
S Throttle body assembly
Ignition timing retard value insufficient for 5 seconds or more S Mass air flow meter
P050B during 10 seconds of P050A monitoring duration at cold start (2 S Air induction system
trip detection logic) S PCV hose connections
S ECM
MONITOR DESCRIPTION
Accumulated Intake Air Value (g) Ignition Timing
P050B Detected
Pass Detected Advanced
5 or more
P050A Detected
Threshold Threshold
Pass Detected
0
Retarded
3 10 3 10
Time (Second) Time (Second)
Engine Start Engine Start
CMC0004
DI-269-2
DIAGNOSTICS - ENGINE (1GR-FE)
The ECM monitors the intake air amount during idling and the ignition timing.
When the engine coolant temperature is between -10_C and 50_C (14_F and 122_F), the ECM calculates
the idling intake air amount for 10 seconds, beginning 3 seconds after the engine starts.
When the accumulated value is below the threshold, the ECM interprets this as a malfunction in the Idle
Speed Control (ISC) system at cold start.
The ECM also monitors the ignition timing at cold start, and judges it to be incorrect when it is advanced to
the same value for a warm engine for 5 seconds or more of the 10 second monitoring period.
Example:
P050A is detected when all conditions below are met (2 trip detection logic).
1. The engine coolant temperature is -10_C (14_F) or more when the engine starts.
2. The engine idles for 13 seconds after engine start.
3. The accumulated intake air amount is below the threshold.
If a malfunction is not repaired successfully, the ECM sets the DTC and illuminates the MIL 13 seconds after
the engine is next started.
NOTICE:
When the negative battery terminal is disconnected during inspection or repairs, the ISC Iearning
values are cleared. The ISC Iearning must be performed by warming up the engine and idling for 5
minutes with the engine coolant temperature at 75_C (167_F) or more because DTCs cannot be de-
tected with the ISC learning values cleared.
MONITOR STRATEGY
P050A Idle speed control problem at cold
Related DTCs
R l t d DTC
P050B Idle ignition timing problem at cold
Required Sensors/Components (Main) Mass air flow meter
Required Sensors/Components (Related) Engine Coolant Temperature (ECT) sensor, Throttle position sensor, Vehicle speed sensor
Frequency of Operation Once per driving cycles
Duration 10 seconds
MIL Operation 2 driving cycles
Sequence of Operation None
DI-269-3
DIAGNOSTICS - ENGINE (1GR-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-18
DTCs are not present
P050A:
Battery voltage 8V -
Time after engine start 3 seconds -
Starter OFF
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