TOYOTA SIENNA 2007 Service Repair Manual

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

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–309
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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 (See page ES-39).
(e) Switch the ECM from normal mode to check mode using
the tester (See page ES-43).
(f) Start the engine to idle for a minute.
OK:
Stable fast idling.
(g) Read the DTCs.
OK:
No DTC output.
NEXT
15CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
END

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–311
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MONITOR DESCRIPTION
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Related DTCs 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 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)
Atmospheric pressure 76 kPa (570 mmHg) or more
A153342E01

ES–3122GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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TYPICAL MALFUNCTION THRESHOLDS
INSPECTION PROCEDURE
HINT:
• DTC P050B may be set when the engine shows the symptom as listed below. If necessary, check the
trouble area as listed below.
• 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 P050B 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.
Accumulated time when ignition timing retard value is insufficient 5 seconds or more
Symptoms Factor Trouble Area
Low idle speed at engine cold.Excessive engine friction• Engine oil deterioration
• Drive belt tension
• A/C compressor
• Generator
• P/S pump
Rough idle at engine cold. Abnormal combustion Fuel quality
1CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B)
Display (DTC Output) Proceed to
P050B A
P050B and other DTCs B
GO TO DTC CHART
2READ VALUE USING INTELLIGENT TESTER (FUEL TRIM)

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–313
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(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
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. Go to step 12
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

ES–3142GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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OK:
Air cleaner filter element is not excessively
contaminated with dirt or oil.
NG
OK
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 Go to step 11
7REPLACE MASS AIR FLOW METER
Go to step 15
8CHECK AND REPAIR VVT SENSOR
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

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

ES–3162GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
MONITOR DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is off. This power allows the
ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls
below a minimum level, these memories are cleared and the ECM determines that there is a malfunction
in the power supply circuit. When the engine is next started, the ECM illuminates the MIL and sets the
DTC.
HINT:
If DTC P0560 is set, the ECM does not store other DTCs.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
WIRING DIAGRAM
DTC P0560 System Voltage
DTC No. DTC Detection Condition Trouble Area
P0560Open in ECM back up power source circuit (1 trip
detection logic)• Open in back up power source circuit
• EFI No. 1 fuse
•ECM
Related DTCs P0560: ECM system voltage
Required Sensors / Components (Main) ECM
Required Sensors / Components (Related) -
Frequency of Operation Continuous
Duration 3 seconds
MIL Operation Immediate (MIL illuminated after next engine start)
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentNone
Stand-by RAM Initialized
ECM power source Less than 3.5 V
A118508E18

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–317
ES
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) Remove the EFI No. 1 fuse from the engine room
junction block.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
Below 1
(c) Reinstall the EFI No. 1 fuse.
NG
OK
(a) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
1CHECK FUSE (EFI NO. 1 FUSE)
A080011E09
REPLACE FUSE (EFI NO. 1 FUSE)
2INSPECT ECM (BATT VOLTAGE)
A162489E13
Tester Connection Specified Condition
BATT (E4-3) - E1 (E11-1) 9 to 14 V
Go to step 3
REPLACE ECM (See page ES-498)