engine TOYOTA SIENNA 2007 Service Repair Manual

ES–3902GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Key-off monitor sequence 1 to 8
1. Atmospheric pressure measurement
2. First reference pressure measurement
3. EVAP canister vent valve close stuck check
4. Vacuum introduction
5. EVAP canister purge valve close stuck check
6. Second reference pressure measurement
Related DTC P2420: Vent valve stuck open (vent)
Required Sensors/Components Purge VSV and pump module
Frequency of Operation Once per driving cycle
Duration Within 2 minutes
MIL Operation 2 driving cycles
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentNone
Atmospheric pressure 70 to 110 kPa (525 to 825 mmHg)
Battery voltage 10.5 V or more
Vehicle speed Less than 2.5 mph (4 km/h)
Ignition switch OFF
Time after key-off 5 or 7 or 9.5 hours
EVAP pressure sensor malfunction (P0450, P0452,
P0453)Not detected
EVAP canister purge valve Not operated by scan tool
EVAP canister vent valve Not operated by scan tool
EVAP leak detection pump Not operated by scan tool
Both of the following conditions 1 and 2 are set before
key-off-
1. Duration that vehicle driven 5 minutes or more
2. EVAP purge operation Performed
ECT 4.4 to 35
C (40 to 95F)
IAT 4.4 to 35
C (40 to 95F)
Next sequence is run if the following condition is met -
Atmospheric pressure change Less than 0.3 kPa (2.25 mmHg) in 1 second
Next sequence is run if the following conditions are met Condition 1, 2 and 3
1. EVAP pressure just after reference pressure
measurement start-1 kPa (-7.5 mmHg) or less
2. Reference pressure -4.85 to -1.057 kPa (-36.384 to -7.929 mmHg)
3. Reference pressure Saturated within 1 minutes
Next sequence is run if the following condition is met -
EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more
Next sequence is run if the following condition is met -
EVAP pressure Saturated within 15 minutes
Next sequence is run if the following condition is met -
EVAP pressure change after purge valve is open 0.3 kPa (2.25 mmHg) or more
Next sequence is run if the following conditions are met Condition 1, 2, 3 and 4

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–391
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7. Leak check
8. Atmospheric pressure measurement
TYPICAL MALFUNCTION THRESHOLDS
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page ES-19).
1. EVAP pressure just after reference pressure
measurement-1 kPa (-7.5 mmHg) or less
2. Reference pressure -4.85 to -1.057 kPa (-36.384 to -7.929 mmHg)
3. Reference pressure Saturated
4. Difference between first reference pressure and
second reference pressureLess than 0.7 kPa (5.25 mmHg)
Next sequence is run if the following condition is met -
EVAP pressure when vacuum introduction was
completeLower than second reference pressure
EVAP monitor is complete if the following condition is
met-
Atmospheric pressure difference between sequence 1
and 8Within 0.3 kPa (2.25 mmHg)
EVAP pressure change after EVAP canister vent valve is ON Less than 0.3 kPa (2.25 mmHg)

ES–3922GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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DTC SUMMARY
DESCRIPTION
To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built
into the ECM, measures 5 hours (+/- 15 minutes) from when the ignition switch is turned off, before the
monitor is run. This allows the fuel to cool down, which stabilizes the Fuel Tank Pressure (FTP). When 5
hours have elapsed, the ECM turns on.
DTC P2610ECM / PCM Internal Engine Off Timer Perfor-
mance
DTCs Monitoring Item Malfunction Detection Condition Trouble AreaDetection
TimingDetection
Logic
P2610Soak timer (built into
ECM)ECM internal malfunction ECMEngine
running2 trip
A165555E02

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–393
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MONITOR DESCRIPTION
5 hours after the ignition switch is turned off, the soak timer activates the ECM to begin the EVAP system
monitor. While the engine is running, the ECM monitors the synchronization of the soak timer and the
CPU clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the
MIL and sets the DTC (2 trip detection logic).
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
INSPECTION PROCEDURE
HINT:
• DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required.
ECM replacement is required.
• 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) Replace the ECM (See page ES-498).
NEXT
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Clear the DTCs (See page ES-39).
(d) Start the engine and wait for 10 minutes or more.
Required Sensors / Components ECM
Frequency of Operation Once per driving cycle
Duration 10 minutes
MIL Operation 2 driving cycles
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentNone
Ignition switch ON
Engine Running
Battery voltage 8 V or more
Sta r t e r OF F
Soak timer measurement when ECM CPU clock counts
10 minutesLess than 7 minutes or more than 13 minutes
1REPLACE ECM
2CHECK WHETHER DTC OUTPUT RECURS

ES–3942GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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(e) Select the following menu items on the tester:
DIAGNOSIS / ENHANCED OBD II / DTC INFO /
PENDING CODES.
(f) If no pending DTC is displayed, the repair has been
successfully completed.
OK:
No DTC output.
NG
OKCHECK FOR INTERMITTENT PROBLEMS
END

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–395
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HINT:
• DTC P2A00 indicates malfunctions related to the bank 1 A/F sensor.
• DTC P2A03 indicates malfunctions related to the bank 2 A/F sensor.
• Bank 1 refers to the bank that includes cylinder No. 1.
• Bank 2 refers to the bank that includes cylinder No. 2.
• Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and
located near the engine assembly.
DESCRIPTION
Refer to DTC P2195 (See page ES-355).
MONITOR DESCRIPTION
After the engine is warmed up, the ECM performs air-fuel ratio feedback control to maintain the air-fuel
ratio at the stoichiometric level. In addition, active A/F ratio control is performed for approximately 10
seconds after preconditions are met in order to measure the A/F sensor response rate. During active A/F
ratio control, the ECM forcibly increases and decreases the injection volume to a certain amount, based
on the stoichiometric air-fuel ratio learned during normal air-fuel ratio control, and measures the A/F
sensor response rate. The ECM receives a signal from the A/F sensor while performing active A/F ratio
control and uses it to calculate the A/F sensor response rate deterioration level.
If the value for A/F sensor response rate deterioration level is less than the threshold, the ECM interprets
this as a malfunction and sets the DTC.
DTC P2A00A/F Sensor Circuit Slow Response (Bank 1
Sensor 1)
DTC P2A03A/F Sensor Circuit Slow Response (Bank 2
Sensor 1)
DTC No. DTC Detection Condition Trouble Area
P2A00
P2A03Calculated value for air-fuel ratio (A/F) sensor response
rate deterioration level is less than threshold• Open or short in A/F sensor circuit
• A/F sensor
•ECM

ES–3962GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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CONFIRMATION DRIVING PATTERN
HINT:
Performing this confirmation driving pattern will activate the A/F sensor response monitor.
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position.
3. Turn the tester on.
4. Clear the DTCs (where set).
5. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / MONITOR INFO / MONITOR
RESULT.
G034991E07
A079199E49

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–397
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6. Check that RES RATE B1S1 and RES RATE B2S1 is INCOMPL.
7. Start the engine and warm it up (Procedure "A").
8. Drive the vehicle at between 25 mph and 75 mph (40 km/h and 120 km/h) for 3 minutes. However, the
vehicle should be driven at a constant speed (Procedure "B").
9. Check the monitor result values on the intelligent tester by selecting the following menu items:
DIAGNOSIS / ENHANCED OBD II / MONITOR INFO / MONITOR RESULT /RES RATE B1S1 and
RES RATE B2S1 / Enter.
10. If the values indicated on the tester do not change, perform READINESS MONITOR DRIVE
PATTERN for the A/F sensor and the heated oxygen sensor (See page ES-22).
HINT:
Completion of all A/F sensor monitors is required to change the value in test result.
11. Note the value of the Monitor Result.
12. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
13. Check if any DTCs (any pending DTCs) are set.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Related DTCsP2A00: A/F sensor (Bank 1) slow response
P2A03: A/F sensor (Bank 2) slow response
Required Sensors / Components (Main) A/F sensor
Required Sensors / Components (Related) Vehicle speed sensor, Crankshaft position sensor
Frequency of Operation Once per driving cycle
Duration 10 to 15 seconds
MIL Operation 2 driving cycles
Sequence of Operation None
The monitor will run whenever these DTCs are not
presentP0031, P0032, P0051, P0052 (A/F Sensor heater Sensor 1), P0100, P0101, P0102,
P0103 (MAF Sensor), P0110, P0112, P0113 (IAT Sensor), P0115, P0116, P0117,
P0118 (ECT Sensor), P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135
(TP Sensor), P0125 (Insufficient ECT for Closed Loop), P0171, P0172 (Fuel
System), P0300, P0301, P0302, P0303, P0304, P0305, P0306 (Misfire), P0335
(CKP Sensor), P0340 (CMP Sensor), P0450, P0451, P0452, P0453 (EVAP System),
P0500 (VSS), P2196, P2198 (A/F Sensor (Rationality))
Active A/F control Performing
Active A/F control is performed when the following
conditions are met-
Battery voltage 11 V or more
Engine coolant temperature 75
C (167F) or more
Idle OFF
Engine RPM Less than 4000 rpm
A/F sensor status Activated
Fuel-cut OFF
Engine load 10 to 70%
G034992E04

ES–3982GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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TYPICAL MALFUNCTION THRESHOLDS
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page ES-19).
WIRING DIAGRAM
Refer to DTC P2195 (See page ES-359).
INSPECTION PROCEDURE
HINT:
Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE
TEST. The A/F CONTROL function can help to determine whether the Air-Fuel Ratio (A/F) sensor, Heated
Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the A/F CONTROL operation using an intelligent
tester.
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine and turn the tester on.
(c) Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
(d) Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/
F CONTROL.
(e) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT
button to change the fuel injection volume).
(f) Monitor the voltage outputs of the A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and
O2S B2S2) displayed on the tester.
HINT:
• The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection
volume by 25%.
• Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
Standard voltage
NOTICE:
The Air-Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen
(HO2) sensor has a maximum output delay of approximately 20 seconds.
Shift position 2 or more
Catalyst monitor Not yet
MAF 2.5 to 15 g/s
Response rate deterioration level Less than 0.18 V
Tester Display (Sensor) Injection Volumes Status Voltages
AFS B1S1 or AFS B2S1 (A/F) +25% Rich Less than 3.0
AFS B1S1 or AFS B2S1 (A/F) -12.5% Lean More than 3.35
O2S B1S2 or O2S B2S2 (HO2) +25% Rich More than 0.55
O2S B1S2 or O2S B2S2 (HO2) -12.5% Lean Less than 0.4

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–399
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– Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of
both the A/F and HO2 sensors.
– To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II
/ ACTIVE TEST / A/F CONTROL / USER DATA / AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S
B2S2. Press the YES button and then the ENTER button. Then press the F4 button.
HINT:
• DTC P2A00 or P2A03 may be also set when the air-fuel ratio is stuck rich or lean.
CaseA/F Sensor (Sensor 1)
Output VoltageHO2 Sensor (Sensor 2)
Output VoltageMain Suspected
Trouble Area
1-
2•A/F sensor
•A/F sensor
heater
•A/F sensor
circuit
3•HO2 sensor
• HO2 sensor
heater
• HO2 sensor
circuit
4• Fuel pressure
• Gas leakage
from exhaust
system
(Air-fuel ratio
extremely lean
or rich)