throttle body TOYOTA SIENNA 2007 Service Owner's Manual

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–161
ES
FAIL-SAFE
When this DTC, as well as other DTCs relating to ETCS (Electronic Throttle Control System)
malfunctions, is set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to
the throttle actuator off, and the throttle valve is returned to a 6.5
throttle angle by the return spring. The
ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition
timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue at a
minimal speed. If the accelerator pedal is depressed slowly, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition
information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data
can be helpful in determining whether the vehicle was running or stopped, whether the engine was
warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of
a malfunction.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTC.
Result
HINT:
If any DTCs other than P0121 are output, troubleshoot
those DTCs first.
B
A
1CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO DTC P0121)
Display (DTC output) Proceed to
P0121 A
P0121 and other DTCs B
GO TO DTC CHART
REPLACE THROTTLE BODY

ES–3002GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
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.
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 are met:
• The learned idling air flow volume remains at the maximum or minimum volume 5 times or more in a
drive cycle.
• While driving at 6 mph (10 km/h) or more, the actual engine idling speed varies from the target idling
speed by between 100 rpm and 200 rpm, 5 times or more in a drive cycle.
DTC P0505 Idle Control System Malfunction
DTC No. DTC Detection Condition Trouble Area
P0505Idling speed continues to vary greatly from target idling
speed (2 trip detection logic)•ETCS
• Intake system
• PCV hose connection
•ECM

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–303
ES
OK:
No leakage from intake system.
NG
OK
(a) Check the throttle valve condition.
OK:
No foreign objects between the throttle valve and
housing.
NG
OKREPAIR OR REPLACE INTAKE SYSTEM
4CHECK THROTTLE VALVE
REPLACE THROTTLE BODY (See page ES-
493)
REPLACE ECM (See page ES-498)

ES–3042GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
This monitor will run when the engine is started at -10 to 50C (14 to 122F) of the engine coolant
temperature. The DTC will set after the engine idling for 13 seconds (2 trip detection logic).
The DTC is designed to monitor the idle air control at cold start. When the engine is started at lower than
50
C (122F) of the engine coolant temperature, the ECM measures the accumulated mass air flow at the
engine idling. If it does not reach the criteria within 10 seconds, the ECM interprets this as a malfunction.
The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2
trip detection logic).
The ETCS (Electrical Throttle Control System) controls the idle speed. The ETCS operates the throttle
actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle
speed.
NOTICE:
When the negative battery terminal is disconnected during inspection or repairs, the ISC (Idle
Speed Control) learned values are cleared. ISC learning is performed when the engine has been
warmed up and idled for 5 minutes because this DTC cannot be set after the ISC learned values
cleared.
DTC P050A Cold Start Idle Air Control System Performance
DTC No. DTC Detection Condition Trouble Area
P050AAccumulated intake air amount for 10 seconds of idling after
cold start is less than threshold (2 trip detection logic)• Throttle body assembly
• Mass air flow meter
• Intake system
• PCV hose connections
• VVT system
• Air cleaner filter element
•ECM

ES–3082GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
NEXT
NEXT
NEXT
NEXT
NEXT
(a) Check for deposits around the throttle valve and throttle
valve condition.
OK:
No deposits around throttle valve and throttle valve
moves smoothly.
NG
OK
NEXT
NEXT
7REPLACE MASS AIR FLOW METER
Go to step 15
8CHECK AND REPAIR VVT SYSTEM
Go to step 15
9REPAIR OR REPLACE PCV HOSE
Go to step 15
10REPAIR OR REPLACE INTAKE SYSTEM
Go to step 15
11REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
Go to step 15
12CHECK THROTTLE VALVE
Go to step 14
13REPLACE ECM
Go to step 15
14REPAIR OR REPLACE THROTTLE BODY ASSEMBLY
Go to step 15

ES–3102GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DESCRIPTION
This monitor will run when the engine is started at -10 to 50C (14 to 122F) of the engine coolant
temperature. The DTC will set after the engine idling for 13 seconds (2 trip detection logic).
The DTC is designed to monitor the idle air control at cold start. When the engine is started at lower than
50
C (122F) of the engine coolant temperature, the ECM measures the accumulated mass air flow at the
engine idling. If it does not reach the criteria within 10 seconds, the ECM interprets this as a malfunction.
The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2
trip detection logic).
The ETCS (Electrical Throttle Control System) controls the idle speed. The ETCS operates the throttle
actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle
speed.
NOTICE:
When the negative battery terminal is disconnected during inspection or repairs, the ISC (Idle
Speed Control) learned values are cleared. ISC learning is performed when the engine has been
warmed up and idled for 5 minutes because this DTC cannot be set after the ISC learned values
cleared.
DTC P050B Cold Start Ignition Timing Performance
DTC No. DTC Detection Condition Trouble Area
P050BIgnition timing retard value insufficient for 5 seconds or more
for 10 seconds of P050A monitoring duration at cold start (2
trip detection logic)• Throttle body assembly
• Mass air flow meter
• Intake system
• PCV hose connections
• VVT system
• Air cleaner filter element
•ECM

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–315
ES
NEXT
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 DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Clear the DTCs.
(e) Switch the ECM from normal mode to check mode using
the tester.
(f) Start the engine to idle for a minute.
OK:
Stable fast idling.
(g) Read the DTCs.
OK:
No DTC output.
NEXT
14REPAIR OR REPLACE THROTTLE BODY ASSEMBLY
Go to step 15
15CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)
END

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–337
ES
DESCRIPTION
The throttle actuator is operated by the ECM and opens and closes the throttle valve using gears.
The opening angle of the throttle valve is detected by the Throttle Position (TP) sensor, which is mounted
on the throttle body. The TP sensor provides feedback to the ECM. This feedback allows the ECM to
appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to
driver inputs.
HINT:
This ETCS (Electronic Throttle Control System) does not use a throttle cable.
MONITOR DESCRIPTION
The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and
open circuits in the throttle actuator based on this value. If the current is outside the standard range, the
ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does
not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM
then illuminates the MIL and sets a DTC.
Example:
When the electrical current is more than 10 A, or less than 0.5 A and the throttle actuator duty ratio
exceeds 80%, the ECM interprets this as the current being outside the standard range, and illuminates the
MIL and sets a DTC.
If the malfunction is not repaired successfully, a DTC is set when the engine is quickly revved up to a high
rpm several times after the engine has idled for 5 seconds after engine start.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All:
DTC P2102 Throttle Actuator Control Motor Circuit Low
DTC P2103 Throttle Actuator Control Motor Circuit High
DTC No. DTC Detection Condition Trouble Area
P2102Conditions (a) and (b) continue for 2.0 seconds (1 trip
detection logic):
(a) Throttle actuator duty ratio exceeds 80% or more
(b) Throttle actuator current is 0.5 A or less• Open in throttle actuator circuit
• Throttle actuator
•ECM
P2103Either of the following conditions is met:
• Hybrid IC diagnosis signal fails
• Hybrid IC current limiter port fails• Short in throttle actuator circuit
• Throttle actuator
• Throttle valve
• Throttle body
•ECM
Related DTCsP2102: Throttle actuator current (low current)
P2103: Throttle actuator current (high current)
Required Sensors / Components (Main) Throttle actuator (throttle body)
Required Sensors / Components (Related) None
Frequency of Operation Continuous
DurationP2102: 2 seconds
P2103: 25 times or 0.6 seconds
MIL Operation Immediate
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentNone

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–339
ES
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
• Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition
information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame
data can be helpful in determining whether the vehicle was running or stopped, whether the engine
was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the
time of a malfunction.
• The throttle actuator current (THROTTLE MOT) and the throttle actuator duty ratio (THROTTLE OPN /
THROTTLE CLS) can be read using the intelligent tester. However, the ECM shuts off the throttle
actuator current when the ETCS malfunctions.
(a) Disconnect the T2 throttle body connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(c) Reconnect the throttle body connector.
NG
OK
1INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE CONTROL MOTOR)
G041063E08
A059778E56
Tester Connection Condition Specified Condition
M+ (T2-2) - M- (T2-1) 20
C (68F) 0.3 to 100
REPLACE THROTTLE BODY (See page ES-
493)

ES–3402GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Disconnect the T2 throttle body connector.
(b) Disconnect the E9 ECM connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance :
Check for open
Check for short
(d) Reconnect the throttle body connector.
(e) Reconnect the ECM connector.
NG
OK
(a) Check for foreign objects between the throttle valve and
the housing.
OK:
Normal
NG
OK
(a) Check if the throttle valve opens and closes smoothly.
OK:
The throttle valve opens and closes smoothly.
NG
OK
2CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)
A114631E09
Tester Connection Specified Condition
M+ (T2-2) - M+ (E9-5) Below 1
M- (T2-1) - M- (E9-4) Below 1
Tester Connection Specified Condition
M+ (T2-2) or M+ (E9-5) - Body ground 10 k
or higher
M- (T2-1) or M- (E9-4) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (THROTTLE CONTROL
MOTOR - ECM)
3INSPECT THROTTLE BODY
REMOVE FOREIGN OBJECT AND CLEAN
THROTTLE BODY
4INSPECT THROTTLE VALVE
REPLACE THROTTLE BODY (See page ES-
493)
REPLACE ECM (See page ES-498)