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DI-712
DIAGNOSTICS - ENGINE (2UZ-FE)
DICN9-02

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
P0501
(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-713
DIAGNOSTICS - ENGINE (2UZ-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-437
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 2.48 L/sec. or less, or 11 L/sec. or more
DI-714
DIAGNOSTICS - ENGINE (2UZ-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 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 relevant DTC chart (See page DI-477).

2 Check connection of PCV piping.

NG Repair or replace PCV piping.

OK
DI-715
DIAGNOSTICS - ENGINE (2UZ-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.

Check electric throttle control system
(See page SF-41).
DI-715-1
DIAGNOSTICS - ENGINE (2UZ-FE)

DTC P050A Cold Start ldle Air Control System
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 in-
crease the catalyst temperature at cold start.
DTC No. DTC Detection Conditions Trouble Areas
S Throttle body assembly
Accumulated intake air amount during 10 seconds of idling S Mass air flow meter
P050A S Air induction system
after cold start, less than threshold (2 trip detection logic)
S PCV hose connections
S ECM

MONITOR DESCRIPTION

Accumulated Intake Air Value (g)

Pass Detected

P050A Detected

Threshold

3 10

Time (Second)
Engine Start

cmc0678
DI-715-2
DIAGNOSTICS - ENGINE (2UZ-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 3 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 3 seconds after
the engine is next started.
NOTICE:
When the negative battery terminal is disconnected during inspection or repairs, the ISC learning
values are cleared. The ISC learning 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
Related DTCs P050A Idle speed control 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

TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present

P050A:
Battery voltage 8V -
Time after engine start 3 seconds -
Starter OFF
ECT at engine start -10_C (14_F) -
ECT -10_C (14_F) 50_C (122_F)
Engine idling time 3 seconds -
Fuel-cut OFF
Vehicle speed - 1.86 mph (3 km/h)
Time after shift position changed 1 second -
DI-715-3
DIAGNOSTICS - ENGINE (2UZ-FE)

TYPICAL MALFUNCTION THRESHOLDS
P050A:
Accumulated air flow amount Varies with ECT (Example: Less than 102 g)

INSPECTION PROCEDURE
HINT:
Read the freeze frame data using the intelligent tester. The freeze frame data records the engine condition
when malfunctions are detected. When troubleshooting, the freeze frame data can help determine if the ve-
hicle 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 P050A).

(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Select the following the menu items: DIAGNOSIS / EN-
HANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTC.
RESULT:
Display (DTC Output) Proceed to
P050A A
P050A and other DTCs B
HINT:
If any DTC other than P050A is output, troubleshoot those DTC
first.

B GO TO DTC CHART.

A
DI-715-4
DIAGNOSTICS - ENGINE (2UZ-FE)

2 Read value using intelligent tester (Fuel trim).

HINT:
Calculate the total fuel trim values to check the characteristic
deviation of the mass air flow meter.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Select the following menu items: DIAGNOSIS / EN-
HANCED OBD II / DATA LIST / PRIMARY / SHORT FT #1
and LONG FT #1.
(e) Read the values displayed on the tester.
(f) Add together the SHORT FT #1 and LONG FT #1 values
to obtain the total FUEL TRIM.
OK:
Total of the SHORT FT #1 and LONG FT #1 values is
between -20 % and 20 %.

OK Go to step 8.

3 Check PCV hose connections.

OK:
PCV hose is connected correctly and is not damaged.

NG Go to step 5.

4 Check air induction system.

(a) Check the air induction system for vacuum leakage.
OK:
No leakage from the air induction system.

OK Go to step 6.

NG Go to step 7.
DI-715-5
DIAGNOSTICS - ENGINE (2UZ-FE)

5 Repair or replace PCV hose.

NEXT Go to step 11.

6 Replace mass air flow meter.

NEXT Go to step 11.

7 Repair or replace air induction system.

NEXT Go to step 11.

8 Check throttle valve.

(a) Check for deposits around the throttle valve.
OK:
No deposits around the throttle valve.

OK Go to step 9.

NG Go to step 10.

9 Replace ECM.

NEXT Go to step 11.

10 Replace throttle body assembly.

NEXT
DI-715-6
DIAGNOSTICS - ENGINE (2UZ-FE)

11 Check whether DTC output recurs (DTC P050A).

NOTICE:
In this operation, the engine must be cold (the same level
as the engine coolant temperature recorded in the freeze
frame data).
(a) Connect the intelligent tester to the DTC3.
(b) Turn the ignition switch ON.
(c) Turn the tester ON.
(d) Clear DTCs (See page DI-462).
(e) Switch the ECM from normal mode to check mode using
the tester (See page DI-463).
(f) Start the engine to idle for a minute.
OK:
Stable fast idling.
(g) Read DTCs.
OK:
No DTCs output.

END

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