2001 TOYOTA SEQUOIA O2 sensor

A23486
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
P0455
ON: Open
OFF: Closed
OFF: Vent ON: Closed
10
Standard
sec60
E
P0456
OK
EVAP Pressure when EVAP system Leaks:
Leak PressureSecond 0.02 inch
Standard x 0.2
± DIAGNOSTICSENGINE
DI±275
469 Author: Date:
2005 SEQUOIA (RM1146U)
(a) P0455: EVAP (Evaporative Emission) gross leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP
system pressure is measured. If the stabilized system pressure is higher than [second 0.02 inch leak pres-
sure standard x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large
leakage, illuminates the MIL and sets the DTC (2 trip detection logic).
(b) P0456: EVAP very small leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP
system pressure is measured. If the stabilized system pressure is higher than second 0.02 inch leak pres-
sure standard, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets
the DTC (2 trip detection logic).
MONITOR STRATEGY
RltdDTCP0455Gross leak detectedRelated DTCsP0456Very small leak (0.020 inch hole) detected
Required sensors/componentsPurge VSV, Pump module
Frequency of operationOnce per driving cycles
DurationWithin 15 min. (varies with amount of fuel in tank)
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
Following values are when atmospheric is
760 mmHg (100 kPa)±
EVAP key±off monitor runs when all of the
following conditions met:±

DI±276
± DIAGNOSTICSENGINE
470 Author: Date:
2005 SEQUOIA (RM1146U) Atmospheric pressure
525 to 825 mmHg (70 to 110 kPa)
Battery voltage10.5 V±
Vehicle speed±4 km/h (2.5 mph)
Ignition switchOFF
Engine conditionNot running
Time after engine stopped5 hours
FTP sensor malfunction (P0450, P0452,
P0453)Not detected
Purge VSVNot operated by scan tool
Vent valveNot operated by scan tool
Leak detection pumpNot operated by scan tool
Both of the following conditions are met
before IG switch OFFCondition 1 and 2
1. Duration that vehicle is driven5 min.±
2. Purge flowExecuted
ECT4.4 to 35°C (40 to 95°F)
IAT4.4 to 35°C (40 to 95°F)
Example of re±start time±
First time7 hours
Second time9 hours and 30 min.
Key±off monitor sequence1 to 8
1. Atmospheric pressure±
Next sequence is run if following condition
set±
Atmospheric pressure change for 10 sec.±2.25 mmHg (0.3 kPa) for 1 sec.
2. First reference pressure±
Next sequence is run if all of following
conditions setCondition 1, 2 and 3
1. FTP when 4 sec. after reference pres-
sure measurement±±7.5 mmHg (±1 kPa)
2. Reference pressure±36.38 to ±7.93 mmHg (±4.85 to ±1.057 kPa)
3. Reference pressureSaturated
3. Vent valve stuck closed check±
Next sequence is run if following condition
set±
FTP change for 10 sec. after vent valve
ON (closed)2.25 mmHg (0.3 kPa)±
4. Vacuum introduction and leak±
Next sequence is run if both of following
conditions setCondition 1 and 2
1. Vacuum introduction time±15 min.
2. FTPFTP was saturated
5. Purge VSV stuck closed check±
Next sequence is run if following condition
set±
FTP change for 10 sec. after purge VSV
ON (open)2.25 mmHg (0.3 kPa)±

P22487
Vehicle Speed
SensorCombination
MeterECM 4±pulse 4±pulse DI±278
± DIAGNOSTICSENGINE
472 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0500 Vehicle Speed Sensor ºAº
DTC P0503 Vehicle Speed Sensor ºAº Intermittent/
Erratic/High
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4±pulse signal for every revolution of the rotor shaft, which is ro-
tated by the transmission output shaft via the driven gear. After this signal is converted into a more precise
rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted
to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0500Step 1
No vehicle speed sensor sig-
nal to ECM under following
conditions: (2 trip detection
logic)

Vehicle is being driven

Combination meter

Open or short in vehicle speed sensor circuit

Vehicle speed sensor
ECM
P0503DI±11Intermittent problem in the ve-
hicle speed sensor circuit
ECM
MONITOR DESCRIPTION
The ECM assumes that the vehicle is driven when the park/neutral position switch is OFF and it has been
over 4 sec. since the actual vehicle speed was 9 km/h (6 mph) or more.
If there is no signal from the vehicle speed sensor when these conditions are satisfied, the ECM concludes
that there is a fault in the vehicle speed sensor. The ECM will turn on the MIL and a DTC is set.
DID8B±01

A23556
8 J17
J/CECM Combination Meter
SPD
E5 G±O
B G±O 25
C5
B
± DIAGNOSTICSENGINE
DI±279
473 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
Related DTCsP0500Vehicle speed sensor ºAº pulse input error
Main sensorsVehicle speed sensor
Required sensors/componentsRelated sensorsPark/Neutral position switch, Engine coolant tem-
perature sensor, Combination meter
Frequency of operationContinuous
Duration500 times
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Vehicle speed is 9 km/h (5.59 mph) or
more4 sec.±
Park/neutral position switchOFF
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Sensor signalNo pulse input
WIRING DIAGRAM

B17411
SPD(+) E6
E5
E1
AT7809
4 to 6 V
Turn the Wheel
3
2
1
I25536
Component Side Connector:
Vehicle Speed Sensor
± DIAGNOSTICSENGINE
DI±281
475 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check voltage between terminal SPD and E1 of ECM connector.
PREPARATION:
(a) Shift the shift lever to neutral.
(b) Jack up the rear wheel on one side.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between the specified terminal of the E5
and E6 ECM connector when the wheel is turned slowly.
OK:
Standard:
Tester ConnectionSpecified Condition
SPD (E5±8) ± E1 (E6±1)Generated intermittently
HINT:
The output voltage should fluctuate up and down similarly to the
diagram on the left when the wheel is turned slowly.
OK Replace ECM (See page SF±80).
NG
3 Check vehicle speed sensor.
PREPARATION:
(a) Disconnect the vehicle speed sensor connector.
(b) Connect the battery positive (+) lead to terminal 1 and the
battery negative (±) lead to terminal 2.
(c) Connect the tester positive (+) lead to terminal 3 and the
tester negative (±) lead to terminal 2.
(d) Shift the shift lever to N position.
(e) Rotate the shaft.
CHECK:
Check that there is voltage change between terminals 2 and 3.
OK:
Standard: 0 V to 10 V or more
NG Replace vehicle speed sensor.
OK

BR3795OK NGClearance
B17411
SPD(+) E5
A23540
Wire Harness Side:
Front View
Combination Meter Connector C5
DI±282
± DIAGNOSTICSENGINE
476 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check sensor installation (Vehicle speed sensor).
CHECK:
Check the vehicle speed sensor installation.
OK:
The vehicle speed sensor is installed properly.
NG Tighten sensor installation bolt.
OK
5 Check for open and short in harness and connector between combination meter
and ECM.
PREPARATION:
(a) Disconnect the C5 combination meter connector.
(b) Disconnect the E5 ECM connector.
CHECK:
Check for resistance between the wire harness side connec-
tors.
OK:
Standard (Check for open):
Symbols (Terminal No.)Specified condition
SPD (E5±8) ± C5±25Below 1 W
Standard (Check for short):
Symbols (Terminal No.)Specified condition
SPD (E5±8) or C5±25 ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Check combination meter circuit (See page
DI±1632

± DIAGNOSTICSENGINE
DI±289
483 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
Related DTCsP0505Idle air control malfunction
Main sensors/componentsCrankshaft position sensor
Required sensors/componentsRelated sensors/componentsVehicle speed sensor, Engine coolant tempera-
ture sensor
Frequency of operationOnce per driving cycle
Duration10 min.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
EngineRunning
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Either of the following conditions is met:Condition 1 or 2
1. Frequency that both of the following conditions (a) and (b)
are met:5 times or more
(a) Engine RPM ± target engine RPMLess than ±100 rpm or more than 150 rpm
(b) Vehicle conditionStop after vehicle was driven by 10 km/h (6.25 mph) or more
2. Frequency that both of the following conditions (a) and (b)
are met:Once
(a) Engine RPM ± target engine RPMLess than ±100 rpm or more than 150 rpm
(b) Intake air control flow rate learning value2.48 L/sec. or less, or 11 L/sec. or more

DI±292
± DIAGNOSTICSENGINE
486 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0560 System Voltage
MONITOR DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the
ECM to store data such as DTC history, freeze frame data, fuel trim values, and other data.
If the battery voltage falls below a minimum level, the ECM will conclude that there is a fault in the power
supply circuit. The next time the engine starts, the ECM will turn on the MIL and a DTC will be set.
DTC No.DTC Detecting ConditionTrouble Area
P0560Open in back up power source circuit

Open in back±up power source circuit

EFI fuse

ECM
HINT:
If DTC P0560 present, the ECM will not store another DTC.
MONITOR STRATEGY
Related DTCsP0560System voltage malfunction
Required sensors/componentsECM
Frequency of operationContinuous
Duration3 sec.
MIL operationImmediate (*1)
Sequence of operationNone
*1: The DTC is set immediate. The MIL will be illuminated after the engine starts in the next time.
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Stand±by RAMInitialized
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Battery voltageLess than 3.5 V
DICF7±02