2007 TOYOTA SIENNA Service Repair Manual

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Page 569 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–2762GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
2. First reference pressure measurement
3. EVAP canister vent valve close stuck check
4. Vacuum introduction
5. EVAP canister purge valve close

ES–2762GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
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
7. Leak check
8. Atmospheric pressure measurement
TYPICAL MALFUNCTION THRESHOLDS
Purge flow:
EVAP VSV stuck open:
EVAP VSV stuck closed:
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page ES-19).
Next sequence is run if the following conditions are met Conditions 1, 2 and 3
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 within 1 minute
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 Conditions 1, 2, 3 and 4
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)
Both of the following conditions are met Conditions (a) and (b)
(a) EVAP pressure change when purge flow is started Less than 0.1 kPa (0.75 mmHg)
(b) EVAP pressure change during purge flow when
EVAP pressure switching valve ON (closed)Less than 0.5 kPa (3.75 mmHg)
EVAP pressure when vacuum introduction is complete Higher than reference pressure x 0.2
EVAP pressure change after EVAP canister purge
valve is openLess than 0.3 kPa (2.25 mmHg)

Page 570 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–277
ES
DTC SUMMARY
HINT:
The canister pressure sensor is built into the canister pump module.
DESCRIPTION
The description can be found in the EVAP (Ev

Page 571 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–2782GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
MONITOR DESCRIPTION
1. DTC P0450: Pressure sensor abnormal voltage fluctuation
If the pressure sensor voltage output rapidly fluctuates between

ES–2782GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
MONITOR DESCRIPTION
1. DTC P0450: Pressure sensor abnormal voltage fluctuation
If the pressure sensor voltage output rapidly fluctuates between less than 0.45 V and more than 4.9 V,
the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and
stops the EVAP (Evaporative Emission) system monitor. The ECM then illuminates the MIL and sets
the DTC (1 trip detection logic).
2. DTC P0451: Pressure sensor abnormal voltage fluctuation or being constant
If the pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP
system monitor. The ECM interprets this as the pressure sensor voltage fluctuating, and stops the
EVAP system monitor. The ECM then illuminates the MIL and sets the DTC.
Alternatively, if the sensor voltage output does not change for 10 seconds, the ECM interprets this as
the sensor being stuck, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.
(Both the malfunctions are detected by 2 trip detection logic.)
3. DTC P0452: Pressure sensor voltage low
If the pressure sensor voltage output is below 0.45 V, the ECM interprets this as an open or short circuit
malfunction in the pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then
illuminates the MIL and sets the DTC (1 trip detection logic).
4. DTC P0453: Pressure sensor voltage high
If the pressure sensor voltage output is 4.9 V or more, the ECM interprets this as an open or short
circuit malfunction in the pressure sensor or its circuit, and stops the EVAP system monitor. The ECM
then illuminates the MIL and sets the DTC (1 trip detection logic).
MONITOR STRATEGY
Related DTCsP0450: Evaporative emission control system pressure sensor/switch chattering
P0451: Evaporative emission control system pressure sensor noise
P0451: Evaporative emission control system pressure sensor stuck
P0452: Evaporative emission control system pressure sensor/switch low input
P0453: Evaporative emission control system pressure sensor/switch high input
Required Sensors / Components Pump module
Frequency of OperationOnce per driving cycle: P0451 sensor stuck
Continuous: P0451 sensor noising, P0450, P0452 and P0453
A140644E06

Page 572 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–279
ES
TYPICAL ENABLING CONDITIONS
All:
P0451 (Noise monitor):
P0451 (Stuck monitor):
P0450, P0452 and P0453:
TYPICAL MALFUNCTION THRESHOLDS
(a) P0450

Page 573 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–2802GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
WIRING DIAGRAM
A136107E03

Page 574 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–281
ES
INSPECTION PROCEDURE
NOTICE:
• When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle
condition. For exam

Page 575 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–2822GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
Result
(d) Reconnect the ECM connector.
B
A
(a) Disconnect the C27 canister pump module connector.
(b) Disconnect the E4 ECM connector.
(c) Mea

Page 576 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–283
ES
B
(a) Disconnect the C27 canister pump module connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage and resistanc

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