2001 TOYOTA SEQUOIA Service Repair Manual

headlights set clock catalytic converter OBD port battery climate settings

Load previous 8 pages

Page 457 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual Status
A/F S1Status
O2S S2A/F Condition and A/F and
HO2 Sensors ConditionMisfiresMain Suspected Trouble Areas
Proceed To
LeanLean/Rich Normal
± Three±way Catalytic Converter (TWC)
Gas leakage fro

Page 458 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±256
± DIAGNOSTICSENGINE
450 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check gas leakage on exhaust system.
OK:
No exhaust gas leakage.
NG Repair or replace exhaust gas leakage point.
OK
Replace

Page 459 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±257
451 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0441 Evaporative Emission Control System Incor-
rect Purge Flow
DTC SUMMARY
DTCsMonitoring ItemsMalfunction Detection Con

Page 460 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±258
± DIAGNOSTICSENGINE
452 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
The two monitors, Key±Off and Purge Flow, are used to detect malfunctions relating to DTC P0441. The
Key�

DI±258
± DIAGNOSTICSENGINE
452 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
The two monitors, Key±Off and Purge Flow, are used to detect malfunctions relating to DTC P0441. The
Key±Off monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours* after the ignition
switch is turned to OFF. The purge flow monitor runs while the engine is running.
1. KEY±OFF MONITOR
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 then 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 461 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

Page 462 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A23484
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
OK
Malfunction
ON: Open
OFF: Closed
OFF: V

Page 463 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±261
455 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
Purge VSV stuck open
Related DTCsP0441Purge VSV stuck closedRelated DTCsP0441
Purge flow
Required sensors/com

Page 464 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±262
± DIAGNOSTICSENGINE
456 Author: Date:
2005 SEQUOIA (RM1146U) Next sequence is run if all of following
conditions set
Condition 1, 2 and 3
1. FTP when 4 sec. after reference pres-
sure mea

Load next 8 pages

Page: < prev 1-10 ... 425-432 433-440 441-448 449-456 457-464 465-472 473-480 481-488 489-496 ... 4328 next >

air bleeding battery horn homelink oil level brake fluid