TOYOTA SEQUOIA 2001 Service Repair Manual

B17430
HA1A
A1A+
A1A±
HA2A
A2A+
A2A±
HT1B
OXIB
HT2B
OX2B
E2
PRG
ACIS
AIV1
AIV2
THA
E2G
VG
E2
THW
PPMP
VPMP
MPMP#10
#20
#30
#40
#50
#60
#70
#80
IGT1
IGT2
IGT3
IGT4
IGT5
IGT6
IGT7
IGT8
IGF1
IGF2 To A/F Relay
A/F Sensor
(Bank 1 Sensor 1)
A/F Sensor
(Bank 2 Sensor 1)
HO2 Sensor
(Bank 1 Sensor 2)
HO2 Sensor
(Bank 2 Sensor 2) To EFI Relay
To EFI No.2
Fuse
VSV (EVAP)
VSV (ACIS)
VSV (AI Control)
VSV (AI Control)
Mass Air Flow
Meter
ETC Sensor
Pump Modul
Pressure
Sensor
Control
Valve To VC
TerminalTo Battery
IGN2
Fuel Injector #1
Fuel Injector #2
Fuel Injector #3
Fuel Injector #4
Fuel Injector #5
Fuel Injector #6
Fuel Injector #7
Fuel Injector #8
Ignition Coil and
Igniter No.1
Ignition Coil and
Igniter No.2
Ignition Coil and
Igniter No.3
Ignition Coil and
Igniter No.4
Ignition Coil and
Igniter No.5
Ignition Coil and
Igniter No.6
Ignition Coil and
Igniter No.7
Ignition Coil and
Igniter No.8
± DIAGNOSTICSENGINE
DI±7
201 Author: Date:
2005 SEQUOIA (RM1146U)

B17431
AIDI
AIRP
AIRV
AIP
GE01
M+
M±
VTA1
VC
VTA2
FC
FPRACCR
ST1±
STP
E01
E02
E04
E05
E1
E03
ME01
EC
EOM
TC
CANL
CANH
IMI
IMODLC3
CG
TC
CANL
CANH ASVAI Driver To EFI Relay
To Battery
To Battery
To Battery To E2
TerminalTo E2
TerminalTo IG SW
Air Pump
Pressure
Sensor
Throttle Body
C/OPN Relay
Fuel Pump Relay
Fuel Pump Resister
Fuel PumpTransponder Key
Computre Stop Light SW
To IGN1 Fuse
To EFI
RelayACC Cut Relay
To Battery DI±8
± DIAGNOSTICSENGINE
202 Author: Date:
2005 SEQUOIA (RM1146U)

DI3H8±10
Vehicle Brought to Workshop
Customer Problem Analysis P. DI±10
Problem Symptom Confirmation
If the engine does not start perform steps 10 and 12 firstConnect the OBD II scan tool or hand±held tester to DLC3.
If the display indicates a communication fault in the tool, inspect DLC3 P.DI±40
Check DTC and Freeze Frame Data
Record or Print DTC and Freeze Frame Data P. DI±43
Clear DTC and Freeze Frame Data P. DI±43
Visual Inspection
Setting the Check Mode Diagnosis P. DI±44
Symptom Simulation P. IN±24
Basic Inspection P. DI±12DTC Chart P. DI±58
Problem Symptoms Table P. DI±33
Circuit Inspection P. DI±73
Adjustment, Repair
DTC Check P. DI±43
Items insideare titles of pages in
in the bottom portion. See the indicated
pages for detailed explanations. this manual, with the page number
Malfunction
occurs.Malfunction does not occur.
Parts Inspection
Check for Intermittent Problems P. DI±11
Identification of Problem
Confirmation Test
End 1
2
3
4
5
6
7
108
9
11
12
13
15 14
16
Normal Malfunction code.
17The hand±held tester can be used at
bold frame.
± DIAGNOSTICSENGINE
DI±9
203 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the procedure on the following page.

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

DID7R±01
± DIAGNOSTICSENGINE
DI±11
205 Author: Date:
2005 SEQUOIA (RM1146U)
CHECK FOR INTERMITTENT PROBLEMS
HINT:
Hand±held tester only:
Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with a hand±held
tester when the ECM is in check mode. In check mode, the ECM uses 1trip detection logic, which is more
sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
(d) Clear DTCs (see page DI±43).
(e) Switch the ECM from normal mode to check mode using a hand±held tester (see page DI±44).
(f) Perform a simulation test (see page IN±24).
(g) Check and wiggle the harness(es), connector(s) and terminal(s) (see page IN±35).

DID7S±01
DI±12
± DIAGNOSTICSENGINE
206 Author: Date:
2005 SEQUOIA (RM1146U)
BASIC INSPECTION
When the malfunction is not confirmed in the DTC check, troubleshooting should be carried out in all the
possible circuits considered as causes of the problem. In many cases, by carrying out the basic engine check
shown in the following flowchart, the location causing the problem can be found quickly and efficiently. There-
fore, using this check is essential in the engine troubleshooting.
1 Is battery voltage 11 V or more when engine stopped?
NO Charge or replace battery.
YES
2 Is engine cranked?
NO Proceed to page ST±15 and continue to trouble-
shoot.
YES
3 Does engine start?
NO Go to step 6.
YES

± DIAGNOSTICSENGINE
DI±13
207 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check air filter.
PREPARATION:
Remove the air filter.
CHECK:
Visual check that the air filter is not excessively dirty or oily.
NG Repair or replace
air filter.
OK
5 Check idle speed (See page EM±11).
NG Proceed to problem symptoms table on page
DI±33.
OK
6 Check fuel pressure (See page SF±7).
NG Proceed to page SF±7 and continue to trouble-
shoot.
OK
7 Check for spark (See page IG±1).
NG Proceed to page IG±1 and continue to trouble-
shoot.
OK
Proceed to problem symptoms table on page
DI±33.

DID7T±01
DI±14
± DIAGNOSTICSENGINE
208 Author: Date:
2005 SEQUOIA (RM1146U)
REGISTRATION
NOTICE:
The Vehicle Identification Number (VIN) must be input into the replacement ECM.
HINT:
The VIN is in the form of a 17±digit alphanumeric vehicle identification number. A hand±held tester is re-
quired to register the VIN.
1. DESCRIPTION
This registration section consists of three parts, Input Instructions, Read VIN and Write VIN.
(a) Input Instructions: Explains the general VIN input instructions using a hand±held tester.
(b) Read VIN: Explains the VIN reading process in a flowchart. This process allows the VIN stored in the
ECM to be read, in order to confirm that the two VINs, provided with the vehicle and stored in the ve-
hicle's ECM, are the same.
(c) Write VIN: Explains the VIN writing process in a flowchart. This process allows the VIN to be input into
the ECM. If the ECM is changed, or the VIN and VIN do not match, the VIN can be registered, or over-
written in the ECM by following this procedure.
2. INPUT INSTRUCTIONS
(a) Hand±held tester
The arrow buttons (UP, DOWN, RIGHT and LEFT) and numerical buttons (0 to 9) are used, in order
to input the VIN.
(b) Cursor Operation
To move the cursor around the tester screen, press the RIGHT and LEFT buttons.
(c) Alphabetical Character Input
(1) Press the UP and DOWN buttons to select the desired alphabetical character.
(2) After selection, the cursor should move.
(d) Numeric Character Input
(1) Press the numerical button corresponding to the number that you want to input.
(2) Select or input the correct character using the UP/DOWN buttons, or the numerical buttons.
HINT:
Numerical characters can be selected by using the UP and DOWN buttons.
(e) Correction
(1) After input, the cursor should move.
(2) When correcting the input character(s), put the cursor onto the character using the RIGHT or
LEFT buttons.
(f) Finishing Input Operation
(1) Make sure that the input VIN matches the vehicle VIN after input.
(2) Press the ENTER button on the tester.

START
Confirm vehicle VIN
Preparation:
1. Connect hand±held tester to DLC3
2. Turn ignition switch to ON
3. Turn tester ON
Hand±held tester operation:
1. Select DIAGNOSIS
2. Select ENHANCED OBD ll
READ:
Menu Screen:
*********************************
[ VIN ]
*********************************
PRESS [EXIT]
ERROR
PRESS [EXIT] DTC P0630 was detected.
P0630 [VIN Not Programmed
or Mismatch ± ECM/PCM]
Please input the VIN.
PRESS [EXIT] Possible cause:
To Menu Screen
17±digit VIN
displayed 3. Select VIN
DTC P0630 Set VIN Previously StoredVIN Not Stored
[EXIT] [EXIT][EXIT] 2. VIN WRITEVIN
Select VIN READ
1. VIN READ 1. VIN READ
ERROR
ECM does not respond the VIN.
1: VIN is not written yet.
2: Vehicle does not support this
function.
± DIAGNOSTICSENGINE
DI±15
209 Author: Date:
2005 SEQUOIA (RM1146U)
3. READ VIN (Vehicle Identification Number)
(a) Read VIN using a hand±held tester.

START
Confirm vehicle VIN
Preparation:
1. Connect hand±held tester to DLC3
2. Turn ignition switch to ON
3. Turn tester ON
Hand±held tester operation:
Write:
Menu Screen:
This function overwrites the
following VIN with a new VIN.
*********************************
[ VIN ]
*********************************
[YES] to Continue
[NO] to EXIT
To Menu ScreenContinued on next page
NOTICE
Do you wish to continue?
[YES]
[NO] 1. Select DIAGNOSIS
2. Select ENHANCED OBD ll
3. Select VIN
1. VIN READ 1. VIN READVIN
Select VIN WRITE
[YES] or [NO]
[YES] 2. VIN WRITE
To Menu
Screen
[NO]
CONFIRMATION
This function will erase the
DTCs automatically after
writing the VIN.
Do you wish to continue?
[YES]
17±digit VIN displayed VIN Previously Stored
DI±16
± DIAGNOSTICSENGINE
210 Author: Date:
2005 SEQUOIA (RM1146U)
4. WRITE VIN
(a) Write VIN using the hand±held tester.