TOYOTA SIENNA 2007 Service Repair Manual

ES–2982GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
(a) Remove the S12 stop light switch assembly.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(c) Reinstall the stop light switch assembly.
NG
OK
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
tester on.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY / STOP
LIGHT SW.
(d) Check the STP signal when the brake pedal is
depressed and released.
Standard
(e) Measure the voltage according to the value(s) in the
table below.
Standard voltage
OK
NG
2INSPECT STOP LIGHT SWITCH ASSEMBLY
A072924E24
Switch Position Tester Connection Specified Condition
Switch pin free 1 - 2 Below 1
Switch pin free 3 - 4 10 k or higher
Switch pin pushed in 1 - 2 10 k
or higher
Switch pin pushed in 3 - 4 Below 1
REPLACE STOP LIGHT SWITCH ASSEMBLY
3READ VALUE OF INTELLIGENT TESTER (STP SIGNAL AND ST1 - VOLTAGE)
G035663E12
Brake Pedal Operation Specified Condition
Depressed STP signal ON
Released STP signal OFF
Tester Connection Brake Pedal Operation Specified Condition
ST1- (E4-16) - E1 (E11-1) Depressed Below 1.5 V
ST1- (E4-16) - E1 (E11-1) Released 7.5 to 14 V
CHECK FOR INTERMITTENT PROBLEMS

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–299
ES
(a) Disconnect the S12 stop light switch connector.
(b) Disconnect the E4 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 stop light switch connector.
(e) Reconnect the ECM connector.
NG
OK
4CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)
A114629E09
Tester Connection Specified Condition
Stop light switch (S12-1) - STP (E4-15) Below 1
Stop light switch (S12-4) - ST1- (E4-16) Below 1
Tester Connection Specified Condition
Stop light switch (S12-1) or STP (E4-15) - Body
ground10 k
or higher
Stop light switch (S12-4) or ST1- (E4-16) - Body
ground10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (STOP LIGHT SWITCH - ECM)
REPLACE ECM (See page ES-498)

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–301
ES
Example:
If the actual idling speed varies from the target idling speed by more than 200 rpm* 5 times in a drive
cycle, the ECM illuminates the MIL and sets the DTC.
*: Threshold idling speed varies according to the engine load.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
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 Continuous
Duration 10 minutes
MIL Operation 2 driving cycles
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentNone
Engine Running
Either of following conditions is met Condition 1 or 2
1. Frequency that both of the following conditions (a)
and (b) met5 times or more
A082389E22

ES–3022GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
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 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) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTCs.
Result
HINT:
If any DTCs other than P0505 are output, troubleshoot
those DTCs first.
B
A
OK:
PCV hose is connected correctly and is not damaged.
NG
OK
(a) Check the intake system for vacuum leakage.
(a) Engine RPM - target engine RPM Below -100 rpm, or 150 rpm or more
(b) Vehicle condition Stop after vehicle was driven by 6.25 mph (10.06 km/h) or more
2. Frequency that both of the following conditions (a)
and (b) are metOnce
(a) Engine RPM - target engine RPM Below -100 rpm, or 150 rpm or more
(b) IAC flow rate learning valve 1.3 L/sec. or less, or 8.5 L/sec. or more
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)
Display (DTC Output) Proceed to
P0505 A
P0505 and other DTCs B
GO TO DTC CHART (See page ES-56)
2CHECK PCV HOSE CONNECTIONS
REPAIR OR REPLACE PCV HOSE
3CHECK INTAKE SYSTEM

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

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–305
ES
MONITOR DESCRIPTION
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
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 cycle
Duration 10 seconds
MIL Operation 2 driving cycles
Sequence of Operation None
Battery voltage 8 V or more
Time after engine start 3 seconds or more
Sta r t e r OF F
ECT at engine start -10
C (14F) or more
ECT -10 to 50
C (14 to 122F)
Engine idling time 3 seconds or more
Fuel-cut OFF
Vehicle speed Less than 1.875 mph (3 km/h)
Time after shift position changed 1 second or more
Atmospheric pressure 76 kPa (570 mmHg) or more
A153341E01

ES–3062GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
TYPICAL MALFUNCTION THRESHOLDS
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) Select the following the menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(e) Read the DTCs.
Result
HINT:
If any DTCs other than P050A are output, troubleshoot
those DTCs first.
B
A
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) Start the engine.
(c) Turn the tester on.
(d) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DATA LIST / PRIMARY / SHORT
FT #1 and LONG FT #1.
(e) Read the values displayed on the tester at engine idles.
(f) Add together the SHORT FT #1 and LONG FT #1 values
to obtain the total FUEL TRIM.
OK:
Total of SHORT FT #1 and LONG FT #1 values is
between -20 % and 20 %.
OK
Accumulated mass air flow Varies with ECT (Example: Less than 20 g)
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A)
Display (DTC Output) Proceed to
P050A A
P050A and other DTCs B
GO TO DTC CHART (See page ES-56)
2READ VALUE USING INTELLIGENT TESTER (FUEL TRIM)
Go to step 12

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–307
ES
NG
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine and turn the tester on.
(c) Warm up the engine.
(d) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1.
(e) Check the engine speed while operating the Oil Control
Valve (OCV) using the tester.
OK
NG
OK
OK:
PCV hose is connected correctly and is not damaged.
NG
OK
(a) Check the intake system for vacuum leakage.
OK:
No leakage from intake system.
NG
OK
(a) Visually check that the air cleaner filter element is not
excessively contaminated with dirt or oil.
OK:
Air cleaner filter element is not excessively
contaminated with dirt or oil.
NG
OK
3PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE OCV)
Tester Operation Specified Condition
OCV OFF Normal engine speed
OCV ON Engine idles roughly or stalls (soon after OCV switched from OFF to ON)
Go to step 8
4CHECK PCV HOSE CONNECTIONS
Go to step 9
5CHECK INTAKE SYSTEM
Go to step 10
6CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
Go to step 11