2001 TOYOTA SEQUOIA fuel pressure

Wire harness side
1
2
3
4
5
6
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
401
2
3
4
5
8 6
10
11
12
13
14
15
16
17
18
19
21
23
24
Terminal No.
Translate ECU
ECM
STA Fuse
Front Seat Inner Belt LH (Buckle Switch)
Overhead Module (Garage Door Opener)
Overhead Module (Garage Door Opener)
Washer Level Sensor
ECM
ECM (*1)
Transponder Key Computer
Body ECU
ECM
ECM
Tire Pressure Monitor ECU
Injector No. 1
Light Control Rheostat
ECM
Speed Sensor
4P OUT (Other Parts)
Fuel Sender Gauge
Oil Pressure Sender Gauge
IGN Fuse
Airbag Sensor Assembly
Memory Seat ECU and SW (*2)
Back Door ECU
Integration Control and Panel
Turn Signal Flasher Relay
Park/Neutral Position Switch
Airbag Sensor AssemblyTranslate ECU
Translate ECU
Skid Control ECU
4WD Control ECU
Alternator
Speed Sensor
Fuel Sender Gauge
Ground
Suspension Control ECU
Body ECU (*4)
Body ECU (*3)
Turn Signal Flasher Relay
Skid Control ECU
ECU±B Fuse
IGN1 Fuse Connectors:
Terminal No.
Wire harness side
C5
C64WD Control ECU
4WD Control ECU
Suspension Control ECU
Suspension Control ECU
Suspension Control ECU
*1: 4WD
*2: w/ Driving Position Memory
*3: w/ Daytime Running Light
*4: w/o Daytime Running LightPark/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch DI±1624
± DIAGNOSTICSCOMBINATION METER SYSTEM
1818 Author: Date:
2005 SEQUOIA (RM1146U)

DID8X±01
DI±1626
± DIAGNOSTICSCOMBINATION METER SYSTEM
1820 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
DATA LIST
According to the DATA LIST displayed by the hand±held tester, you can read the values of the switches,
sensors, actuators and so on without part removal. Reading the DATA LIST as the first step of troubleshoot-
ing is one method to shorten labor time.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the hand±held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Operate the hand±held tester according to the steps on the display and select ºDATA LISTº.
METER:
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
SPEED METER
Vehicle Speed Meter /
Min.: 0 km/h (0 mph)
Max.: 255 km/h (158 mph)Almost the same as actual vehicle
speed (When driving)
TACHO METEREngine RPM /
Min.: 0 rpm Max.: 12,750 rpmAlmost the same as actual engine
speed (When engine is running)
FUEL GAUGEFuel Input /
Min.: 0 Max.: 255Tester indication changes accord-
ing to the fuel receiver gauge
angle.

LIGHT RHEOSTATLight Control Rheostat /
Min.: 0 Max.: 255Light control rheostat switch is
Dark (0) " Bright (255)
OIL GAUGEOil Gauge /
Min.: 0 Max.: 255Tester indication changes accord-
ing to the oil pressure receiver
gauge angle.

ODO/TRIP SWODO / TRIP
ODO/TRIP switch / ON/OFFON: Switch is pushed
OFF: Switch is released

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1627
1821 Author: Date:
2005 SEQUOIA (RM1146U)
ACTIVE TEST
Performing the ACTIVE TEST using the hand±held tester allows the meters, indicators and so on to operate
without part removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to shorten
labor time.
It is possible to display the DATA LIST on the hand±held tester during the ACTIVE TEST.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) From the display on the tester, perform the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
SPEED METER
Operate speedometer: 0 / 40 (24) / 80 (48) / 120
(72) / 160 (96) /
200 (120) km/h (mph)The needle position should be within the accept-
able tolerance
TACHOMETER
Operate tachometer:
0 rpm / 1,000 rpm / 2,000 rpm / 3,000 rpm /
4,000 rpm / 5,000 rpm / 6,000 rpm / 7,000 rpmConfirm that the vehicle is stopped and engine is
idling.
FUEL GAUGEOperate fuel gauge: EMPTY, 1/2, FULLConfirm that the vehicle is stopped and engine is
idling.
COOLANT TEMPOperate engine coolant temperature receiver
gauge: HIGH / NORMAL / LOW (OFF)Confirm that the vehicle is stopped and engine is
idling.
D BELT REMINDOperate driver's seat belt warning light:
OFF / ONConfirm that the vehicle is stopped and engine is
idling.
OPEN DOOR WARNOperate open door warning light:
OFF / ONConfirm that the vehicle is stopped and engine is
idling.
LOW FUEL WARNOperate fuel level warning light:
OFF / ONConfirm that the vehicle is stopped and engine is
idling.
TAILLIGHT INDICOperate taillight indicator light:
OFF / ONConfirm that the vehicle is stopped and engine is
idling.
HEADLIGHT INDICOperate Hi±beam indicator light:
OFF / ONConfirm that the vehicle is stopped and engine is
idling.
SRS WARNOperate SRS warning light:
OFF / ONConfirm that the vehicle is stopped and engine is
idling.
ODO/TRIP DISPOperate ODO/TRIP display: OFF / ONConfirm that the vehicle is stopped and engine is
idling.
KEY REMND BUZZROperate key reminder buzzer: OFF / ONConfirm that the vehicle is stopped and engine is
idling.
SEAT BELT BUZZROperate driver's seat belt warning buzzer:
OFF / ONConfirm that the vehicle is stopped and engine is
idling.
MAINT REQDOperate oil maintenance indicator light:
OFF / ONConfirm that the vehicle is stopped and engine is
idling.
VOLT METEROperate volt meter: 9 V / 12 V / 15 V / 18VConfirm that the vehicle is stopped and engine is
idling.
OIL PRESS METEROperate oil pressure meter: HIGH, 3/4, 1/2, 1/4,
LOW (OFF)Confirm that the vehicle is stopped and engine is
idling.

AC2810
DIDKM±01
AC2811
N11084
Wrong Okay
HI LO HILO
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2297
2491 Author: Date:
2005 SEQUOIA (RM1146U)
AIR CONDITIONING SYSTEM
PRECAUTION
1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR NEAR AN OPEN FLAME
2. ALWAYS WEAR EYE PROTECTION
3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN
YOUR EYES OR ON YOUR SKIN
If liquid refrigerant gets in your eyes or on your skin:
(a) wash the area with lots of cool water.
CAUTION:
Do not rub your eyes or skin.
(b) apply clean petroleum jelly to the skin.
(c) go immediately to a hospital or see a physician for profes-
sional treatment.
4. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED
FLAME
5. BE CAREFUL NOT TO DROP CONTAINER OR APPLY
PHYSICAL SHOCKS TO IT
6. DO NOT OPERATE COMPRESSOR WITHOUT
ENOUGH REFRIGERANT IN REFRIGERATION SYS-
TEM
If there is not enough refrigerant in the refrigerant system, oil lu-
brication will be insufficient and compressor burnout may occur.
Necessary care should be taken to avoid this.
7. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE
WHILE COMPRESSOR IS OPERATE
Open and close only the low pressure valve. If the high pressure
valves are opened, refrigerant flows in the reverse direction
causing the charging cylinder to rupture.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH
REFRIGERANT
If refrigerant is overcharged, it causes problems such as insuffi-
cient cooling, poor fuel economy, engine overheating etc.

EM±2
± ENGINE MECHANICALCO/HC
2581 Author: Date:
2005 SEQUOIA (RM1146U)
5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT
IDLE AND/OR 2,500 RPM
HINT:
When performing the 2 mode (2,500 rpm and idle) test, follow
the measurement orders are prescribed by the applicable local
regulations.
If the CO/HC concentration does not comply with regulations,
perform troubleshooting in the order given below.
(a) Check the air±fuel ratio sensors and heated oxygen sen-
sors operation.(See page DI±88 and DI±93)
(b) See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
COHCProblemsCauses
NormalHighRough idle7. Faulty ignitions:

Incorrect timing

Fouled, shorted or improperly gapped plugs
8. Incorrect valve clearance
9. Leaky intake and exhaust valves
10.Leaky cylinders
LowHighRough idle
(fluctuating HC reading)1. Vacuum leaks:

PCV hoses

Intake manifold

Throttle body

Brake booster line
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)1. Restricted air filter
2. Faulty SFI systems:

Faulty pressure regulator

Defective ECT sensor

Faulty ECM

Faulty injectors

Faulty throttle position sensor

Faulty MAF meter

EM0KR±10
A04458
Compression
Gauge
± ENGINE MECHANICALCOMPRESSION
EM±3
2582 Author: Date:
2005 SEQUOIA (RM1146U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. REMOVE SPARK PLUGS (See page IG±1)
3. CHECK CYLINDER COMPRESSION PRESSURE
(a) Insert a compression gauge into the spark plug hole.
(b) Fully open the throttle.
(c) While cranking the engine, measure the compression
pressure.
HINT:
Always use a fully charged battery to obtain engine speed of
250 rpm or more.
(d) Repeat steps (a) through (c) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Compression pressure:
1,373 kPa (14.0 kgf/cm
2, 199 psi) or more
Minimum pressure:
1,030 kPa (10.5 kgf/cm
2, 149 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2, 14 psi) or less
(e) If the cylinder compression in one or more cylinders is low,
pour small amount of engine oil into the cylinder through
the spark plug hole and repeat steps (a) through (c) for
cylinders with low compression.

If adding oil helps the compression, chances are
that the piston rings and/or cylinder bore are worn
or damaged.

If pressure stays low, a valve may be sticking or
seating is improper, or there may be leakage past
the gasket.
4. REINSTALL SPARK PLUGS (See page IG±1)

A23321
Fuel Pressure
Pulsation Damper
* 33 (340, 24)

39 (400, 29)
PCV
18 (184, 13)
LH Delivery Pipe
N´m (kgf´cm, ft´lbf) : Specified torque

Non±reusable part
* For use with SST
Grommet
Injector
O±Ring

InsulatorFuel Return Pipe
Front Fuel Pipe
Gasket

Gasket
Throttle Body Assembly
39 (400, 29)
Fuel Pressure RegulatorVacuum Hose
RH Delivery PipeVSV for EVAP
VSV for Secondary Air Injection System
VSV Wire Connector
for ACIS
VSV for ACIS
7.5 (76, 66 in.´lbf)
Union
39 (400, 29)
Union

Upper Gasket
7.5 (76, 66 in.´lbf)
7.5 (76, 66 in.´lbf)
21 (214, 15)
21 (214, 15)
Ventilation
Hose
7.5 (76, 66 in.´lbf)
7.5 (76, 66 in.´lbf)

O±Ring

Lower Gasket
7.5 (76, 66 in.´lbf)
18 (185, 13)
± ENGINE MECHANICALCYLINDER HEAD
EM±33
2612 Author: Date:
2005 SEQUOIA (RM1146U)

A23324
(a)
(b)
(c)
(d)
A23325Water Bypass Hose
A23326
A23327
± ENGINE MECHANICALCYLINDER HEAD
EM±37
2616 Author: Date:
2005 SEQUOIA (RM1146U)
13. DISCONNECT HOSES FROM INTAKE MANIFOLD
(a) Disconnect the vacuum hose from the fuel pressure regu-
lator.
(b) Disconnect the PCV hose from the PCV valve on the LH
cylinder head.
(c) Disconnect the EVAP hose (from charcoal canister) from
the VSV for the EVAP.
(d) Disconnect the 2 vacuum hoses from the VSV for the air
injection system.
14. REMOVE INTAKE MANIFOLD ASSEMBLY
(a) Disconnect the 2 water bypass hoses from the throttle
body.
(b) Disconnect the 2 wire clamps from the wire clamp bracket
on the RH delivery pipe.
(c) Remove the 2 bolts holding the engine wire protector from
the intake manifold and cylinder head.
(d) Remove the 2 bolts and ground cables from the RH and
LH cylinder heads.
(e) Remove the bolt and throttle body cover bracket from the
intake manifold.