2007 TOYOTA SIENNA Service Repair Manual

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Page 577 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–2842GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
NOTICE:
When replacing the canister, check the canister
pump module interior and related pipes for water,
fuel and other liquids. If liquids

Page 578 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–285
ES
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
tester on.
(c) Wait for at least

Page 579 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–2862GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DTC SUMMARY
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) System (See page ES-409).
INSPECTION PROCEDURE

ES–2862GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
DTC SUMMARY
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) System (See page ES-409).
INSPECTION PROCEDURE
Refer to the EVAP System (See page ES-412).
MONITOR DESCRIPTION
5 hours*1 after the ignition switch is turned off, the electric vacuum pump creates negative pressure
(vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator
malfunctions based on the EVAP pressure.
HINT:
*1: If the engine coolant temperature is not below 35
C (95F) 5 hours after the ignition switch is turned
off, the monitor check starts 2 hours later. If it is still not below 35
C (95F) 7 hours after the ignition switch
is turned off, the monitor check starts 2.5 hours later.
DTC P0455Evaporative Emission Control System Leak
Detected (Gross Leak)
DTC P0456Evaporative Emission Control System Leak
Detected (Very Small Leak)
DTCs Monitoring ItemMalfunction Detection
ConditionTrouble Area Detection TimingDetection
Logic
P0455 EVAP gross leakVacuum pump creates negative
pressure (vacuum) in EVAP
system and EVAP system
pressure is measured. 0.02 inch
leak pressure standard is
measured at start and end of leak
check.
If stabilized pressure is higher
than [second 0.02 inch leak
pressure standard x 0.2], ECM
determines that EVAP system
has a large leak.• Fuel tank cap (loose)
• Leakage from EVAP
line (Canister - Fuel
tank)
• Leakage from EVAP
line (Purge VSV -
Canister)
• Leakage from pump
module
• Leakage from fuel
tank
• Leakage from canisterWhile ignition
switch OFF2 trip
P0456 EVAP small leakVacuum pump creates negative
pressure (vacuum) in EVAP
system and EVAP system
pressure is measured. 0.02 inch
leak pressure standard measured
at start and end of leak check.
If stabilized pressure is higher
than second 0.02 inch leak
pressure standard, ECM
determines that EVAP system
has a small leak.While ignition
switch OFF2 trip
Sequence Operation Description Duration
- ECM activationActivated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch is
turned off.-
AAtmospheric pressure
measurementVent valve is turned OFF (vent) and EVAP system pressure is
measured by ECM in order to register atmospheric pressure.
If pressure in EVAP system is not between 70 kPa and 110 kPa (525
mmHg and 825 mmHg), ECM cancels EVAP system monitor.10 seconds

Page 580 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–287
ES
*2: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
1. P0455: EVAP (Evaporative Emissio

Page 581 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–2882GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
2. P0456: EVAP very small leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the
EVAP system press

Page 582 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–289
ES
Key-off monitor sequence 1 to 8
1. Atmospheric pressure measurement
2. First reference pressure measurement
3. EVAP canister vent valve close s

2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–289
ES
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
7. Leak check
8. Atmospheric pressure measurement
TYPICAL MALFUNCTION THRESHOLDS
P0455: EVAP gross leak
P0456: EVAP 0.02 inch leak
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 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 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 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 was
met-
Atmospheric pressure difference between sequence 1
and 8Within 0.3 kPa (2.25 mmHg)
EVAP pressure when vacuum introduction is complete Between reference pressure and reference pressure x 0.2
EVAP pressure when vacuum introduction is complete Higher than reference pressure x 0.2

Page 583 of 3000

TOYOTA SIENNA 2007 Service Repair Manual ES–2902GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES
MONITOR RESULT
Refer to CHECKING MONITOR STATUS (See page ES-19).

Page 584 of 3000

TOYOTA SIENNA 2007 Service Repair Manual 2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEMES–291
ES
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU.
The skid control ECU converts t

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