check engine light TOYOTA SEQUOIA 2001 Service Repair Manual

B04770
IN±18
± INTRODUCTIONFOR ALL OF VEHICLES
18 Author: Date:
2005 SEQUOIA (RM1146U)
(4) Check that the VSC TRAC warning light blinks.
(5) After the measurement, remove the SST and re-
start the engine. At this time, make sure that the
VSC TRAC warning light is off.
(b) Notice in VSC operation.
(1) Removal and reinstallation of VSC±related compo-
nents may cause misadjustment of them. Do not re-
move or reinstall them unless necessary.
(2) When conducting VSC±related operations, do not
fail to make sure that the preparation and the finish-
ing of the operation are all performed in accordance
with the direction in this text.
3. FOR VEHICLES EQUIPPED WITH A CATALYTIC CONVERTER
CAUTION:
If a large amount of unburned gasoline flows into the converter, it may overheat and create a fire haz-
ard. To prevent this, observe the following precautions and explain them to your customer.
(a) Use only unleaded gasoline.
(b) Avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes.
(c) Avoid spark jump test.
(1) Perform spark jump test only when absolutely necessary. Perform this test as rapidly as possible.
(2) While testing, never race the engine.
(d) Avoid prolonged engine compression measurement.
Engine compression tests must be done as rapidly as possible.
(e) Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra load on the converter.
(f) Avoid coasting with ignition turned off.
(g) Do not dispose of used catalyst along with parts contaminated with gasoline or oil.
4. IF VEHICLE IS EQUIPPED WITH MOBILE COMMUNICATION SYSTEM
For vehicles with mobile communication systems such as two±way radios and cellular telephones, observe
the following precautions.
(1) Install the antenna as far as possible away from the ECU and sensors of the vehicle's electronic
system.
(2) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the ve-
hicle's electronic systems. For details about ECU and sensor locations, refer to the section on
the applicable component.
(3) Do not wind the antenna feeder together with the other wiring as much as possible, also avoid
running the antenna feeder parallel with other wire harness.
(4) Check that the antenna and feeder are correctly adjusted.
(5) Do not install powerful mobile communication system.

V07268
VIBRATION METHOD: When vibration seems to be the major cause.
CONNECTORS
WIRE HARNESS
PARTS AND SENSOR1
Slightly shake the connector vertically and horizontally.
Slightly shake the wire harness vertically and horizontally.
The connector joint, fulcrum of the vibration, and body
through portion are the major areas to be checked thorough-
ly.
Apply slight vibration with a finger to the part of the sensor
considered to be the problem cause and check that the mal-
function occurs.Shake Slightly
Swing Slightly
Vibrate Slightly
HINT:
Applying strong vibration to relays may result in open relays.
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN±29
29 Author: Date:
2005 SEQUOIA (RM1146U)
3. SYMPTOM SIMULATION
The most difficult case in troubleshooting is when there are no problem symptoms occurring. In such cases,
a thorough customer problem analysis must be carried out, then simulate the same or similar conditions and
environment in which the problem occurred in the customer's vehicle. No matter how much experience a
technician has, or how skilled he may be, if he proceeds to troubleshoot without confirming the problem
symptoms he will tend to overlook something important in the repair operation and make a wrong guess
somewhere, which will only lead to a standstill. For example, for a problem which only occurs when the en-
gine is cold, or for a problem which occurs due to vibration caused by the road during driving, etc., the prob-
lem can never be determined so long as the symptoms are confirmed with the engine hot or the vehicle at
a standstill. Since vibration, heat or water penetration (moisture) is likely cause for problem which is difficult
to reproduce, the symptom simulation tests introduced here are effective measures in that the external
causes are applied to the vehicle in a stopped condition.
Important Points in the Symptom Simulation Test:
In the symptom simulation test, the problem symptoms should be confirmed, but the problem area or parts
must also be found out. To do this, narrow down the possible problem circuits according to the symptoms
before starting this test and connect a tester beforehand. After that, carry out the symptom simulation test,
judging whether the circuit being tested is defective or normal and also confirming the problem symptoms
at the same time. Refer to the problem symptoms table for each system to narrow down the possible causes
of the symptom.

B02389
B02390
HEAT METHOD: When the problem seems to occur when the suspect area is heated. 2
NOTICE:3 WATER SPRINKLING METHOD:
(1)
(2)
4 OTHER: When a malfunction seems to occur when electrical load is excessive.When the malfunction seems to occur on a rainy day or in a
high±humidity condition. Heat the component that is the likely cause of the malfunction
with a hair dryer or similar object. Check to see if the malfunction
occurs.
Sprinkle water onto the vehicle and check to see if the malfunc-
tion occurs.
Turn on all electrical loads including the heater blower, head
lights, rear window defogger, etc. and check to see if the mal-
function occurs.ON HINT:
If a vehicle is subject to water leakage, the leaked water may
contaminate the ECU. When testing a vehicle with a water leak-
age problem, special caution must be taken.
Malfunc-
tion
Do not heat to more than 60 °C (140 °F). (Temperature
is limited not to damage the components.)
Do not apply heat directly to parts in the ECU. (1)
(2)
Never sprinkle water directly into the engine compart-
ment, but indirectly change the temperature and hu-
midity by applying water spray onto the radiator front
surface.
Never apply water directly onto the electronic compo-
nents. NOTICE: IN±30
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
30 Author: Date:
2005 SEQUOIA (RM1146U)

MA002±35
MA±2
± MAINTENANCEINSIDE VEHICLE
49 Author: Date:
2005 SEQUOIA (RM1146U)
INSIDE VEHICLE
GENERAL MAINTENANCE
These are maintenance and inspection items which are considered to be the owner's responsibility.
They can be done by the owner or they can have them done at a service shop.
These items include those which should be checked on a daily basis, those which, in most cases, do not
require (special) tools and those which are considered to be reasonable for the owner to do.
Items and procedures for general maintenance are as follows.
1. GENERAL NOTES

Maintenance items may vary from country to country. Check the owner's manual supplement in which
the maintenance schedule is shown.

Every service item in the periodic maintenance schedule must be performed.

Periodic maintenance service must be performed according to whichever interval in the periodic main-
tenance schedule occurs first, the odometer reading (miles) or the time interval (months).

Maintenance service after the last period should be performed at the same interval as before unless
otherwise noted.

Failure to do even one item can cause the engine to run poorly and increase exhaust emissions.
2. LIGHTS
(a) Check that the headlights, stop lights, taillights, turn signal lights, and other lights are all working.
(b) Check the headlight aim.
3. WARNING LIGHTS AND BUZZERS
Check that all warning lights and buzzers function properly.
4. HORN
Check that it is working.
5. WINDSHIELD GLASS
Check for scratches, pits or abrasions.
6. WINDSHIELD WIPER AND WASHER
(a) Check operation of the wipers and washer.
(b) Check that the wipers do not streak.
7. WINDSHIELD DEFROSTER
Check that air comes out from the defroster outlet when operating the heater or air conditioner.
8. REAR VIEW MIRROR
Check that it is mounted securely.
9. SUN VISORS
Check that they move freely and are mounted securely.
10. STEERING WHEEL
Check that it has the specified free play. Be alert for changes in steering condition, such as hard steering,
excessive free play or strange noises.
11. SEATS
(a) Check that the seat adjusters operate smoothly.
(b) Check that all latches lock securely in any position.
(c) Check that the head restraints move up and down smoothly and that the locks hold securely in any
latch position.
(d) For fold±down seat backs, check that the latches lock securely.
12. SEAT BELTS
(a) Check that the seat belt system such as the buckles, retractors and anchors operate properly and
smoothly.
(b) Check that the belt webbing is not cut, frayed, worn or damaged.

DI3H9±07
ENGINE CONTROL SYSTEM Check Sheet
Customer's Name
Driver's Name
Data Vehicle
Brought in
Engine model
VIN
Production Date
Licence Plate No.
Odometer Reading
Problem Symptoms
Engine does
not Start
Difficult to
Start
Poor Idling
Poor
Driveability
Engine Stall
Others
Engine does not crankNo initial combustionNo complete combustion
Engine cranks slowly
Other
Incorrect first idleIdling rpm is abnormalHigh ( rpm)Low ( rpm)
Rough idling
Other
HesitationBack fireMuffler explosion (after±fire)Surging
Knocking
Other
Soon after startingAfter accelerator pedal depressed
After accelerator pedal released
During A/C operation
Shifting from N to D
Other
Dates Problem
Occurred
Problem Frequency
Condition When
Problem Occurs
Weather
Engine Operation
Engine Temp. Place Outdoor
TemperatureConstant
Sometimes ( times per day/month)Once only
Other
Fine
CloudyRainySnowyVarious/Other
Hot
Warm CoolCold (approx. °C/ °F)
Highway
SuburbsInner cityUphillDownhill
Rough road
Other
Cold
Warming upAfter warming upAny temp.Other
Starting
Just after starting ( min.)IdlingRacing
Driving
Constant speedAccelerationDeceleration
A/C switch ON/OFF
Other
Condition of malfunction indicator lightRemains on Sometimes lights up Does not light up
NormalMalfunction code(s) (code )
Freeze frame data ( )
NormalMalfunction code(s) (code )
Freeze frame data ( )
Normal Mode
(Pre±check)
Check Mode DTC InspectionInspector's
Name
km
miles
(MIL)
DI±10
± DIAGNOSTICSENGINE
204 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK

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.

DID7X±01
FI0534
D13872
Hand±Held Tester
DLC3
DI±40
± DIAGNOSTICSENGINE
234 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. Description

When troubleshooting On±Board Diagnostic (OBD ll) ve-
hicles, the vehicle must be connected to the hand±held
tester. Various data output from the vehicle's ECM can
then be read.

OBD ll regulations require that the vehicle's on±board
computer illuminates the Malfunction Indicator Light (MIL)
on the instrument panel when the computer detects a
malfunction in: 1) the emission control system/compo-
nents, or 2) the powertrain control components (which af-
fect vehicle emissions), or 3) the computer. In addition,
the applicable Diagnostic Trouble Codes (DTCs) pre-
scribed by SAE J2012 are recorded in the ECM memory
(See page DI±58).
If the malfunction does not reoccur in 3 consecutive trips, the
MIL goes off automatically but the DTCs remain recorded in the
ECM memory.
To check the DTC, connect the hand±held tester or OBD II scan
tool to the Data Link Connector 3 (DLC3) of the vehicle. The
hand±held tester or OBD II scan tool also enables you to erase
the DTC and check the freeze frame data and various forms of
engine data (See the instruction manual for the hand±held tes-
ter). The DTC includes SAE controlled codes and manufacturer
controlled codes. SAE controlled codes must be set according
to the SAE, while manufacturer controlled codes can be set by
a manufacturer with certain restrictions (See the DTC chart on
page DI±58).
2. NORMAL MODE AND CHECK MODE
The diagnosis system operates in ºnormal modeº during normal
vehicle use. In ºnormal modeº, 2 trip detection logic* is used to
ensure accurate detection of malfunctions. A ºcheck modeº is
also available to technicians as an option. In ºcheck modeº, 1
trip detection logic is used for simulating malfunction symptoms
and increasing the system's ability to detect malfunctions, in-
cluding intermittent malfunctions (See page DI±11).
3. 2±TRIP DETECTION LOGIC
When a malfunction is first detected, the malfunction is tempo-
rarily stored in the ECM memory. This is known as 1st trip detec-
tion. If the ignition switch is turned OFF and then ON again, and
the same malfunction is detected again, the MIL will illuminate.
This is known as 2nd trip detection.

DI±54
± DIAGNOSTICSENGINE
248 Author: Date:
2005 SEQUOIA (RM1146U)FC TAU
Fuel cut TAU: Fuel cut during very
light load:
ON or OFF
ON: Fuel cut operating
The fuel cut being performed un-
der very light load to prevent the
engine combustion from becoming
incomplete
IGNITIONIgnition counter:
Min.: 0, Max.: 8000 to 800'
CYL #1, #2, #3, #4, #5, #6, #7, #8Misfire ratio of the cylinder 1 to 4:
Min.: 0, Max.: 2550 %This item displayed in only idling
CYL ALLAll cylinders misfire rate:
Min.: 0, Max.: 2550 to 35'
MISFIRE RPMEngine RPM for first misfire range:
Min.: 0 rpm, Max.: 6,375 rpm0 rpm: Misfire 0'
MISFIRE LOADEngine load for first misfire range:
Min.: 0 g/rev, Max.: 3.98 g/rev0 g/rev: Misfire 0'
MISFIRE MARGINMisfire monitoring:
MIn.: ±100 %, Max.: 99.22 %±100 to 99.2 %Misfire detecting margin
#CODES#Codes:
Min.: 0, Max.: 255'Number of detected DTCs
CHECK MODECheck mode:
0: ON, 1: OFFON: Check mode ONSee page DI±44
SPD TEST
Check mode result for vehicle
speed sensor:
0: COMPL, 1: INCOMPL
''
AS TEST
Check mode result for secondary
air injection system:
0: COMPL, 1: INCOMPL
''
MISFIRE TEST
Check mode result for misfire
monitor:
0: COMPL, 1: INCOMPL
''
OXS1 TEST
Check mode result for HO2 sen-
sor :
0: COMPL, 1: INCOMPL
''
OXS2 TEST
Check mode result for HO2 sen-
sor :
0: COMPL, 1: INCOMPL
''
A/F SSR TEST B1
Check mode result for air±fuel ra-
tio sensor :
0: COMPL, 1: INCOMPL
''
A/F SSR TEST B2
Check mode result for air±fuel ra-
tio sensor :
0: COMPL, 1: INCOMPL
''
MILMIL status:
ON or OFFON: MIL ON'
MIL ON RUN DIST
MIL ON Run Distance:
Min.: 0 second,
Max.: 65,535 seconds
Distance after DTC detected'
MIL ON RUN TIME
Running time from MIL ON:
Min.: 0 minute,
Max.: 65,535 minutesEquivalent to running time after
MIL was ON'
ENG RUN TIME
Engine run time:
Min.: 0 second,
Max.: 65,535 seconds
Time after engine startService data
TIME DTC CLEAR
Time after DTC cleared:
Min.: 0 minute,
Max.: 65,535 minutesEquivalent to time after DTCs
were erased'

± DIAGNOSTICSENGINE
DI±285
479 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air±fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Check operation of stop light.
CHECK:
Check if the stop lights come on and go off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit.
OK
2 Check stop light switch (See page BE±47).
NG Replace stop light switch.
OK

B17446
Brake Pedal
DepressedBrake Pedal
Released ON
() ()
ST1±(+)E4
E6
E1(±)
DI±286
± DIAGNOSTICSENGINE
480 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check STP signal and ST1± voltage.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Select the item ºDIAGNOSIS / ENHANCED OBD II /
DATA LIST / ALL / STOP LIGHT SWº.
CHECK:
Read the signal displayed on the hand±held tester.
OK:
Standard:
Brake PedalSpecified Condition
DepressedSTP Signal ON
ReleasedSTP Signal OFF
CHECK:
Measure the voltage between the specified terminals of the E4
and E6 ECM connectors.
OK:
Standard:
Tester ConnectionBrake PedalSpecified Condition
ST1± (E4±12) ±
E1 (E6±1)DepressedBelow 1.5 V
ST1± (E4±12) ±
E1 (E6±1)Released7.5 to 14 V
OK Check for intermittent problems (See page
DI±11).
NG