2001 TOYOTA SEQUOIA Service Repair Manual

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Page 617 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±415
609 Author: Date:
2005 SEQUOIA (RM1146U) 4. Vacuum introduction and leak
±
Next sequence is run if both of following
conditions setCondition 1 and 2
1. Vacuum introdu

Page 618 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±416
± DIAGNOSTICSENGINE
610 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2419 Evaporate Emission System Switching
Valve Control Circuit Low
DTC P2420 Evaporate Emission System Switching
Valve Co

Page 619 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23480
Fuel Tank Canister
Vacuum Pump: OFF Pressure Sensor 0.02 Inch Orifice
Pump Module
Operation A: Atmospheric Pressure Measurement
Vent Valve: OFF (vent)
Operation D: Purge VSV monitor Operation

A23480
Fuel Tank Canister
Vacuum Pump: OFF Pressure Sensor 0.02 Inch Orifice
Pump Module
Operation A: Atmospheric Pressure Measurement
Vent Valve: OFF (vent)
Operation D: Purge VSV monitor Operation B: 0.02 Inch Leak Pressure Measurement
Negative
Pressure Atmospheric
Pressure
Operation C: EVAP Leak Check
Air Filter
Purge VSV: OFFOFF (vent)
ON
OFF
OFF
ON
ON (closed)ON
ON
ON (closed)
± DIAGNOSTICSENGINE
DI±417
611 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
5 hours* after the ignition switch is turned OFF, the electric vacuum pump creates negative pressure (vacu-
um) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions
based on the EVAP pressure.
HINT:
*: If the engine coolant temperature is not below 35C (95F) 5 hours after the ignition switch is turned off,
the monitor check starts 2 hours later. If it is still not below 35C (95F) 7 hours after the ignition switch is
turned off, the monitor check starts 2.5 hours later.
SequenceOperationsDescriptionsDuration
±ECM activationActivated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF.±
AAtmospheric pressure
measurement
Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to
register atmospheric pressure.
If EVAP pressure is not between 70 kPa and 110 kPa (525 mmHg and 825 mmHg), ECM
cancels EVAP system monitor.
10 seconds
B
First 0.02 inch leak
pressure measure-
mentIn order to determine 0.02 inch leak pressure standard, vacuum pump creates negative pres-
sure (vacuum) through 0.02 inch orifice and them ECM checks if vacuum pump and vent
valve operate normally.
60 seconds
CEVAP system pres-
sure measurement
Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then
measured.
Write down the measured value as it will be used in the leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.
15 minutes*
DPurge VSV monitorPurge VSV opened and then EVAP system pressure measured by ECM.
Large increase indicates normal.10 seconds
E
Second 0.02 inch leak
pressure measure-
mentLeak check is performed after second 0.02 inch leak pressure standard is measured.
If stabilized system pressure higher than second 0.02 inch leak pressure standard, ECM
determines that EVAP system leaking.
60 seconds
FFinal checkAtmospheric pressure measured and then monitoring result recorded by ECM.±
* If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

Page 620 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23665
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak Pressure
sec NegativeONON
Sequence
TimeA
10
sec60
Within 15 minutes
sec ON
First 0.02 inch
BCD
EVAP Pressure when Vent Valve Stuck O

Page 621 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23666
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak Pressure
sec NegativeONON
Sequence
TimeA
10
sec60
Within 15 minutesON
First 0.02 inch
BCD
EVAP Pressure when Vent Valve Stuck OFF (v

Page 622 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±420
± DIAGNOSTICSENGINE
614 Author: Date:
2005 SEQUOIA (RM1146U) FTP sensor malfunction (P0450, P0452,
P0453)
Not detected
Purge VSVNot operated by scan tool
Vent valveNot operated by scan to

Page 623 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±421
615 Author: Date:
2005 SEQUOIA (RM1146U) 3. Reference pressure
Saturated
4. Reference pressure difference between
first and second±5.25 mmHg (0.7 kPa)
7. Leak check±

Page 624 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A20311
Pressure
SensorECM
VC
AIP
E2 VC
PIM
E2 DI±422
± DIAGNOSTICSENGINE
616 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2430 Secondary Air Injection System Air Flow/
Pressure Sensor Circuit Bank

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