2001 TOYOTA SEQUOIA fuel cap

MA004±18
P08488
Back Front
± MAINTENANCEENGINE
MA±5
52 Author: Date:
2005 SEQUOIA (RM1146U)
ENGINE
INSPECTION
HINT:
Perform the following procedures when the engine is cold.
1. REPLACE TIMING BELT
(See page EM±13)
2. INSPECT DRIVE BELT
(See page CH±1)
3. REPLACE SPARK PLUGS
(See page IG±1)
4. INSPECT AIR FILTER
(a) Visually check that the air cleaner element is not exces-
sively dirty, damaged or oily.
HINT:
Oiliness may indicate a stuck PCV valve.
If necessary, replace the air cleaner element.
(b) Clean the element with compressed air.
First blow from back side thoroughly, then blow off the
front side of the element.
5. REPLACE AIR FILTER
Replace the used air cleaner element with a new one.
6. REPLACE ENGINE OIL AND OIL FILTER
(See page LU±2)
7. REPLACE ENGINE COOLANT
(See page CO±2)
8. INSPECT CHARCOAL CANISTER
(See page EC±9)
9. REPLACE GASKET IN FUEL TANK CAP
(See page SF±33)
10. INSPECT FUEL LINES, CONNECTIONS, FUEL TANK
VAPOR VENT SYSTEM HOSES AND FUEL TANK
BAND
Visually inspect the fuel lines for cracks, leakage loose connec-
tions, deformation or tank band looseness.
11. INSPECT EXHAUST PIPES AND MOUNTINGS
Visually inspect the pipes, hangers and connections for severe
corrosion, leaks or damage.
12. INSPECT VALVE CLEARANCE
(See page EM±4)

DI±30
± DIAGNOSTICSENGINE
224 Author: Date:
2005 SEQUOIA (RM1146U)
(a) Preconditions
The monitor will not run unless:

MIL is OFF

Fuel level is approximately 1/2 to 3/4

Altitude is 7,800 feet (2,400 m) or less

Engine Coolant Temperature (ECT) is between 4.4°C and 35°C (40°F and 95°F)

Intake Air Temperature (IAT) is between 4.4°C and 35°C (40°F and 95°F)

Cold Soak Procedure has been completed

Before starting the engine, the difference between ECT and IAT must be less than 7°C (13°F)
HINT:
Examples:

Scenario 1
ECT = 24°C (75°F)
IAT = 16°C (60°F)
Difference between ECT and IAT is 8°C (15°F)
" The monitor will not run because difference between ECT and IAT is higher than 7°C (13°F)

Scenario 2
ECT = 21°C (70°F)
IAT = 20°C (68°F)
Difference between ECT and IAT is 1°C (2°F)
" The monitor will run because difference between ECT and IAT is less than 7°C (13°F)
The readiness test can be completed in cold ambient conditions (less than 40°F / 4.4°C) and/or at
high altitudes (more than 7,800 feet / 2,400 m) if the drive pattern is repeated a second time after cycl-
ing the ignition off.
(b) Drive Pattern
(1) Connect the OBD II scan tool to DLC3 to check monitor status and preconditions (refer to (a)).
(2) Release pressure in fuel tank by removing the fuel tank cap and then reinstall it.
(3) Start the engine and allow it to idle until ECT becomes 75°C (167°F) or higher.
(4) Run the engine at 3,000 rpm for approximately 10 seconds.
(5) Allow the engine to idle with the A/C ON (to create slight load) for 15 to 50 minutes.
NOTICE:
If the vehicle is not equipped with A/C, put a slight load on the engine by doing the following :

Securely set the parking brake.

Block the drive wheels with wheel chocks.

Allow the vehicle to idle in drive for 15 to 50 minutes.

DID81±01
DI±48
± DIAGNOSTICSENGINE
242 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
By reading the DATA LIST displayed on a hand±held tester, you can check values, including those of the
switches, sensors, and actuators, without removing any parts. Reading the DATA LIST as the first step of
troubleshooting is one method of shortening diagnostic time.
NOTICE:
In the table below, the values listed under Normal Conditions are for reference only. Do not depend
solely on these values when determining whether or not a part is faulty.
(a) Warm up the engine.
(b) Turn the ignition switch to OFF.
(c) Connect a hand±held tester to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the tester ON.
(f) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST.
(g) Check the values by referring to the table below.
Hand±Held Tester DisplayMeasurement Item:Range
(Display)Normal Condition *Diagnostic Note
INJECTOR
Injection period of the No. 1 cylin-
der:
Min.: 0 ms, Max.: 32.64 ms
2.3 to 3.8 ms: Idling'
IGN ADVANCE
Ignition timing advance for No. 1
cylinder/
Min.: ±64 deg., Max.: 63.5 deg.
BTDC 4 to 17°: Idling'
CALC LOADCalculated load by ECM:
Min.: 0 %, Max.: 100 %
11 to 21 %: Idling

12 to 22 %: Running without load
(2,500 rpm)
'
VEHICLE LOADVehicle load:
Min.: 0 %, Max.: 25700 %Actual vehicle load'
MAFAir flow rate from MAF meter:
Min.: 0 g/s, Max.: 655 g/s2.0 to 3.9 g/s: Idling
If the value approximately 0.0 g/s:

Mass air flow meter power
source circuit open

VG circuit open or short
If the value 160.0 g/s or more:

E2G circuit open
ENGINE SPDEngine speed:
Min.: 0 rpm, Max.: 16,383 rpm600
50 rpm: Idling'
VEHICLE SPDVehicle speed:
Min.: 0 km/h, Max.: 255 km/hActual vehicle speedSpeed indicated on speedometer
COOLANT TEMPEngine coolant temperature:
Min.: ±40C, Max.: 140C80 to 100°C
(176 to 212°F): After warming up

If the value ±40C (±40F): sen-
sor circuit open

If the value 140C (284F): sen-
sor circuit shorted
INTAKE AIRIntake air temperature:
Min.: ±40C, Max.: 140CEquivalent to ambient air tempera-
ture

If the value ±40C (±40F): sen-
sor circuit open

If the value 140C (284F): sen-
sor circuit shorted
SECONDARY AIRSecond air system status:
ON or OFFON: Secondary air system opera-
tion'
AIR±FUEL RATIOAir±fuel ratio:
Min.: 0, Max.: 1.9990.8 to 1.2: During idling'
EVAP VAPOR PRESEVAP vapor pressure:
Min.: ±8192 Pa, Max.: 8191 Pa0 Pa: Fuel tank cap removed'

± DIAGNOSTICSENGINE
DI±49
243 Author: Date:
2005 SEQUOIA (RM1146U)PURGE DENSITY
Learning value of purge density/
Min.: ±50, Max.: 350Idling: ±40 to 0 %Service data
PURGE FLOWPurge flow:
Min.: 0 %, Max.: 102.4 %0 to 100 %: Idling'
EVAP PURGE VSVEVAP (Purge) VSV control duty:
Min.: 0 %, Max.: 100 %0 to 100 %: During idlingOrder signal from ECM
VAPOR PRESSVapor pressure:
Min.: ±4.125 kPa, Max.: 2.125 kPa0 kPa: Fuel tank cap removed
Pressure inside fuel tank moni-
tored by the vapor pressure sen-
sor
KNOCK CRRT VAL
Correction learning value of
knocking:
Min.: ±64 CA, Max.: 1,984 CA0 to 22 CA:
Driving, 44 mph (70 km/h)Service data
KNOCK FB VALFeedback value of knocking:
Min.: ±64 CA, Max.: 1,984 CA±22 to 0 CA
Driving, 44 mph (70 km/h)Service data
ACCEL POS #1
Absolute Accelerator Pedal Posi-
tion (APP) No. 1:
Min.: 0 %, Max.: 100 %10 to 22 %: accelerator pedal is
released
54 to 86 %: accelerator pedal is
fully depressed
'
ACCEL POS #2Absolute APP No. 2:
Min.: 0 %, Max.: 100 %
12 to 42 %: accelerator pedal is
released
66 to 98 %: The accelerator pedal
is fully depressed
'
ACCEL POS #1APP sensor No. 1 voltage:
Min.: 0 V, Max.: 4.98 V'ETCS freeze data
ACCEL POS #2APP sensor No. 2 voltage:
Min.: 0 V, Max.: 4.98 V'ETCS freeze data
ACCEL POS #1APP sensor No. 1 voltage:
Min.: 0 V, Max.: 5 V
0.5 to 1.1 V: accelerator pedal is
released.
2.6 to 4.5 V: or pedal is fully de-
pressed.
'
ACCEL POS #2APP sensor No. 2 voltage:
Min.: 0 V, Max.: 5 V
1.2 to 2.0 V: accelerator pedal is
released.
3.4 to 5.3 V: accelerator pedal is
fully depressed.
'
ACCEL IDL POS
Whether or not accelerator pedal
position sensor detecting idle:
ON or OFF
ON: Idling'
THRTL LEARN VAL
Throttle valve fully closed
(learned value):
0.4 to 0.8 V'
ACCEL SSR #1 AD
Accelerator fully closed value No.1
(AD):
Min.: 0, Max.: 4.98 V
'ETCS service data
ACCEL LRN VAL#1
Accelerator fully closed learning
value No.1:
Min.: 0, Max.: 124.512
'ETCS service data
ACCEL LRN VAL#2
Accelerator fully closed learning
value No.2:
Min.: 0, Max.: 124.512
'ETCS service data
FAIL #1
Whether or not fail safe function
executed:
ON or OFF
ON: ETCS has failed'
FAIL #2
Whether or not fail safe function
executed:
ON or OFF
ON: ETCS has failed'

DI±66
± DIAGNOSTICSENGINE
260 Author: Date:
2005 SEQUOIA (RM1146U)P043E
(DI±445)
Evaporate Emission System
Reference Orifice Clog Up
Pump module
P043F
(DI±445)Evaporate Emission System
Reference Orifice High Flow
Pump module
P0441
(DI±257)Evaporative Emission Control
System Incorrect Purge Flow

Purge valve

Purge valve circuit (between purge valve and ECM)

Leakage from EVAP line (between purge valve and intake
manifold)

EVAP line (between purge valve and canister) clogged

ECM

P0450
(DI±264)Evaporative Emission Control
System Pressure Sensor/Switch
[Fuel Tank Pressure Sensor]

Pump module (including pressure sensor)
P0451
(DI±264)Evaporative Emission Control
System Pressure Sensor/Switch
Range/Performance

Pump module (including pressure sensor)
P0452
(DI±264)Evaporative Emission Control
System Pressure Sensor/Switch
Low Input
Pump module (including pressure sensor)

Connector/Wire harness (between pump module and ECM)

ECM

P0453
(DI±264)Evaporative Emission Control
System Pressure Sensor/Switch
High Input
Pump module (include pressure sensor)

Connector/Wire harness (between pump module and ECM)

ECM

P0455
(DI±273)Evaporative Emission Control
System Leak Detected (Gross
Leak)

Fuel tank cap (loose)

Leakage from EVAP line (between canister and fuel tank)

Leakage from EVAP line (between purge valve and canister)

Leakage from pump module

Leakage from fuel tank

Leakage from canister

P0456
(DI±273)Evaporative Emission Control
System Leak Detected (Very
Small Leak)

Same as DTC No. P0445
P0500
(DI±278)Vehicle Speed Sensor ºAº

Combination meter

Open or short in vehicle speed sensor circuit

Vehicle speed sensor

ECM

P0503
(DI±278)Vehicle Speed Sensor ºAº Inter-
mittent/Erratic/High

Combination meter

Open or short in vehicle speed sensor circuit

Vehicle speed sensor

ECM
±
P0504
(DI±283)Brake Switch ºAº/ºBº Correlation

Short in stop lamp switch signal circuit

STOP fuse

Stop lamp switch

ECM
±
P0505
(DI±288)Idle Air Control System

Air induction system

Electric throttle control system

PCV hose connection

P0560
(DI±292)System Voltage

Back±up power source circuit

EFI No. 1 fuse

ECM

P0604
(DI±296)Internal Control Module Random
Access Memory (RAM) Error
ECM
P0606
(DI±296)ECM/PCM Processor
ECM
P0607
(DI±296)Control Module Performance
ECM

B17388
Active air±fuel
ratio control
Target air±fuel ratio
HO2 sensor
voltageStoichiometric
Air±Fuel Level
Rich
0.21 V
Active air±fuel
ratio control
Target air±fuel ratio
HO2 sensor
voltageLean HO2 SENSOR CIRCUIT LOW VOLTAGE (P0137, P0157: OPEN)
HO2 SENSOR CIRCUIT HIGH VOLTAGE (P0138, P0158: SHORT)OffOperation
OffNormal
Abnormal 15 to 20 seconds
0.59 VAbnormalAbnormal Normal
Operation
Stoichiometric
Air±Fuel Level
± DIAGNOSTICSENGINE
DI±149
343 Author: Date:
2005 SEQUOIA (RM1146U)
Open or Short in the Heated Oxygen (HO2) Sensor Circuit (DTC P0137, P0157, P0138 or P0158)
During active air±fuel ratio control, the ECM calculates the Oxygen Storage Capacity (OSC)* of the Three±
Way Catalytic Converter (TWC) by forcibly regulating the air±fuel ratio to become rich or lean.
If the HO2 sensor has an open or short, or the voltage output of the sensor noticeably decreases, the OSC
indicates an extraordinarily high value. Even if the ECM attempts to continue regulating the air±fuel ratio to
become rich or lean, the HO2 sensor output does not change.
While performing active air±fuel ratio control, when the target air±fuel ratio is rich and the HO2 sensor voltage
output is 0.21 V or less (lean), the ECM interprets this as an abnormally low sensor output voltage and sets
DTC P0137 or P0157. When the target air±fuel ratio is lean and the voltage output is 0.59 V or more (rich)
during active air±fuel ratio control, the ECM determines that the sensor voltage output is abnormally high,
and sets DTC P0138 or P0158.
HINT:
DTC P0138 or P0158 is also set if the HO2 sensor voltage output is more than 1.2 V for 30 seconds or more.
*: The TWC has the capability to store oxygen. The OSC and the emission purification capacity of the TWC
are mutually related. The ECM determines whether the catalyst has deteriorated, based on the calculated
OSC value (see page DI±249).

DI±152
± DIAGNOSTICSENGINE
346 Author: Date:
2005 SEQUOIA (RM1146U) A/F sensor status
Activated
Fuel±cutOFF
Engine load10 to 70%
Shift position4th±
Heated oxygen sensor impedance (Low):
Battery voltage11 V±
Estimated sensor temperature±700°C (1,292°F)
ECM monitorCompleted
P0606Not set
Heated oxygen sensor impedance (High):
Battery voltage11 V±
Estimated sensor temperature450°C (842°F)±
ECM monitorCompleted
P0606Not set
Heated oxygen sensor output voltage (Extremely high):
Battery voltage11 V±
Time after engine start2 sec.±
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Heated oxygen sensor output voltage (Output voltage):
Either of the following conditions is met:Condition 1 or 2
1. All of the following conditions are met:Condition (a), (b) and (c)
(a) Commanded air±fuel ratio14.3 or less
(b) Rear HO2S voltage0.21 to 0.59 V
(c) OSC (Oxygen Storage Capacity of catalyst)3 g or more
2. All of the following conditions are met:Condition (a), (b) and (c)
(a) Commanded air±fuel ratio14.9 or more
(b) Rear HO2S voltage0.21 to 0.59 V
(c) OSC (Oxygen Storage Capacity of catalyst)3 g or more
Heated oxygen sensor output voltage (Low voltage):
All of the following conditions are met:Condition 1, 2 and 3
1. Commanded air±fuel ratio14.3 or less
2. Rear HO2S voltageLess than 0.21 V
3. OSC (Oxygen Storage Capacity of catalyst)3 g or more
Heated oxygen sensor output voltage (High voltage):
All of the following conditions are met:Condition 1, 2 and 3
1. Commanded air±fuel ratio14.9 or more
2. Rear HO2S voltageMore than 0.59 V
3. OSC (Oxygen Storage Capacity of catalyst)3 g or more
Heated oxygen sensor impedance (Low):
Duration of following condition30 sec. or more
Heated oxygen sensor impedanceLess than 5 W
Heated oxygen sensor impedance (High):
Duration of following condition90 sec. or more

± DIAGNOSTICSENGINE
DI±249
443 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0420 Catalyst System Efficiency Below Threshold
(Bank 1)
DTC P0430 Catalyst System Efficiency Below Threshold
(Bank 2)
MONITOR DESCRIPTION
The ECM uses the two sensors, mounted in front of and behind the Three±way Catalytic Converter (TWC),
to monitor its efficiency.
The first sensor, the Air±Fuel Ratio (A/F) sensor (sensor 1), sends pre±catalyst information to the ECM. The
second sensor, the Heated Oxygen (HO2) sensor (sensor 2), sends post±catalyst information to the ECM.
The ECM compares the information transmitted by these two sensors to determine the efficiency of the TWC
performance and its ability to store oxygen.
When the TWC is functioning properly, the variation in the oxygen concentration in the exhaust gas, after
it has passed through the TWC, is small. In this condition, the voltage output of sensor 2 slowly alternates
between the rich and lean signal voltages (shown in the illustration below). As the TWC performance efficien-
cy deteriorates, its oxygen storage capacity decreases, and the variation in the oxygen concentration in the
exhaust gas increases. As a result, the sensor voltage output fluctuates frequently.
While the catalyst monitor is running, the ECM measures the signal lengths of both sensors 1 and 2, and
calculates the ratio of the signal lengths to determine the extent of the TWC deterioration. If the deterioration
level exceeds the preset threshold, the ECM interprets this as the TWC malfunction. The ECM then illumi-
nates the MIL and sets the DTC.
DTC No.DTC Detecting ConditionTrouble Area
P0420
P0430OSC value smaller than standard value under active air±fuel
ratio control (2 trip detection logic)
Gas leakage on exhaust system
A/F sensor (Bank 1, 2 sensor 1)
Heated oxygen sensor (bank 1, 2 sensor 2)
Three±way catalytic converter
HINT:
Bank 1 refers to the bank that includes cylinder No.1.
Bank 2 refers to the bank that does not include cylinder No.1.
Sensor 1 refers to the sensor mounted in front of the Three±Way Catalytic Converter (TWC) and lo-
cated near the engine assembly.
Sensor 2 refers to the sensor mounted behind the TWC and located far from the engine assembly.
DID87±01