2001 TOYOTA SEQUOIA length

± 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

DIDLU±01
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±891
1085 Author: Date:
2005 SEQUOIA (RM1146U)
ABS WITH EBD & BA & TRAC & VSC SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77

When there is a malfunction in the contact point of the terminals or installation problems with
parts, removal and installation of the suspected problem parts may return the system to the
normal condition either completely or temporarily.

In order to determine the malfunctioning area, be sure to check the conditions at the time the
malfunction occurred, such as by DTC output and freeze frame data output, and record it before
disconnecting each connector or removing and installing parts.

Since the ABS with EBD & BA & TRAC & VSC systems may be influenced by a malfunction in
the other systems, be sure to check for DTCs in the other systems.

Be sure to remove and install the ABS & VSC actuator and each sensor with the IG switch OFF
unless specified in the inspection procedure.

When removing and installing the ABS & VSC actuator and each sensor, be sure to check that
the normal display is output in test mode inspection and in DTC output inspection after instal-
ling all the parts.

After replacing the yaw rate sensor and/or the ABS & VSC actuator assembly, make sure to per-
form yaw rate and deceleration sensors' zero point calibration
(See page DI±897).

The CAN communication system is used for data communication between the skid control ECU
(included in the actuator), the steering angle sensor, and the yaw rate sensor (the deceleration
sensor is included). If there is trouble in the CAN communication line, the DTC of the commu-
nication line is output.

If the DTC of the CAN communication line is output, repair the malfunction and troubleshoot
the ABS with EBD & BA & TRAC & VSC systems.

Since the CAN communication line has its own length and route, it can not be repaired tempo-
rarily with the bypass wire, etc.

DIDHX±01
F17795
F19734
Bypass Wire
F17797Tester Probe
DI±1060
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1254 Author: Date:
2005 SEQUOIA (RM1146U)
CAN COMMUNICATION SYSTEM
PRECAUTION
1. BUS LINE REPAIR
(a) After repairing the bus line with solder, wrap the repaired
part with vinyl tape.
NOTICE:

The CANL bus line and CANH bus line must be
installed together all the time.
When installing, make sure to twist them.
CAN bus lines are likely to be influenced by noise if
the bus lines are not twisted.

The difference in length of the CANL bus line and
CANH bus line should be within 100 mm (3.937 in.).

Leave approximately 80 mm (3.150 in.) loose in the
twist around the connector.
(b) Do not use a bypass wire between the connectors.
NOTICE:
The feature of the twisted wire harness will be lost if you
use a bypass wire.
2. CONNECTOR HANDLING
(a) When inserting tester probes into a connector, insert them
from the rear of the connector.

A04448
A23314
SST
A08660
A23315
SST
EM±24
± ENGINE MECHANICALTIMING BELT
2603 Author: Date:
2005 SEQUOIA (RM1146U)
5. INSTALL TIMING BELT GUIDE
Install the belt guide with the cup side facing outward.
6. INSTALL NO.1 TIMING BELT COVER
Install the timing belt cover with the 4 bolts.
7. INSTALL CRANKSHAFT PULLEY
(a) Align the pulley set key with the key groove of the crank-
shaft pulley.
(b) Using SST and a hammer, tap in the crankshaft pulley.
SST 09223±46011
8. INSTALL DRIVE BELT TENSIONER
Install the belt tensioner with the bolt and 2 nuts.
Torque: 26 N´m (265 kgf´cm, 19 ft´lbf)
HINT:
Use a bolt of 106 mm (4.18 in.) in length.
9. INSTALL GENERATOR (See page CH±16)
10. CHECK CRANKSHAFT PULLEY POSITION
Check that the timing mark of the crankshaft pulley is aligned
with timing mark º0º of the No.1 timing belt cover.
11. INSTALL, LH CAMSHAFT TIMING PULLEY
(a) Align the camshaft knock pin with the knock pin groove of
the timing pulley, and slide the timing pulley.
(b) Temporarily install the 4 bolts of the camshaft timing
pulley.
(c) Hold the camshaft timing pulley with SST, and tighten the
pulley bolt.
SST 09960±10010 (09962±01000, 09963±01000)
Torque: 8.1 N´m (83 kgf´cm, 72 in.´lbf)

A04455
(A)
(B)
A04330
A04329
± ENGINE MECHANICALTIMING BELT
EM±27
2606 Author: Date:
2005 SEQUOIA (RM1146U)
19. INSTALL FAN BRACKET
Install the fan bracket with the 2 bolts and 2 nuts.
Torque:
12 mm head
16 N´m (160 kgf´cm, 12 ft´lbf) for (A)
14 mm head
32 N´m (330 kgf´cm, 24 ft´lbf) for (B)
HINT:
Each bolt length is indicated in the illustration.
Bolt Length:
106 mm (4.17 in.) for 12 mm head (A)
114 mm (4.49 in.) for 14 mm head (B)
20. INSTALL A/C COMPRESSOR (See page EM±83)
21. INSTALL NO.2 TIMING BELT COVER
Install the No.2 timing belt cover with the 2 bolts.
Torque: 16 N´m (160 kgf´cm, 12 ft´lbf)
22. INSTALL RH NO.3 TIMING BELT COVER
(a) Fit the RH No.3 timing belt cover, matching it with the fan
bracket.
(b) Install the RH No.3 timing belt cover with the 3 bolts and
nut.
Torque: 7.5 N´m (76 kgf´cm, 66 in.´lbf)

A04456
No.2 Idler
Pulley Bolt
Timing
Mark
Crankshaft
Pulley Bolt
A23334
Movement
(25°)
SSTOil Control Valve
Installation Hole
A23335Service Bolt
A23336
EM±40
± ENGINE MECHANICALCYLINDER HEAD
2619 Author: Date:
2005 SEQUOIA (RM1146U)
(a) Check the crankshaft pulley position.
Check that the timing mark of the crankshaft pulley is
aligned with the centers of the crankshaft pulley bolt and
idler pulley bolt.
NOTICE:
Having the crankshaft pulley at the wrong angle can cause
the piston head and valve head to come into contact with
each other when you remove the camshaft, causing dam-
age. So always set the crankshaft pulley at the correct
angle.
(b) Release the oil from the front bearing caps.
Using SST, rotate the camshaft timing tube from left to
right 2 to 3 times within its VVT±i range (25°) and use a
waste cloth to collect the oil from the camshaft timing oil
control valve installation hole.
SST 09960±10010 (09962±01000, 09963±00400)
NOTICE:
Approximately 20 cc (1.2 cu in.) of oil will be ejected. Take
care not to spill it.
(c) Remove the LH camshafts.
(1) Bring the service bolt hole of the sub±gear upward
by turning the hexagon head portion of the exhaust
camshaft with a wrench.
(2) Secure the sub±gear to the main gear with a service
bolt.
Recommended service bolt:
Thread diameter6 mm
Thread pitch1.0 mm
Bolt length16 to 20 mm (0.63 to 0.79 in.)
HINT:
When removing the camshaft, make sure that the torsional
spring force of the sub±gear has been eliminated by the above
operation.
(3) Align the timing mark (2±dot mark) of the camshaft
drive gear by turning the hexagon head portion of
the exhaust camshaft with a wrench.

A23337
12
345
6
7
811
12 13
14
15
1617
18 2122
910 1920
A23338
Service Bolt
A23339
Approx.
10°
A23340
1 2
21
22
19 20
7
8 11
12
13
14
15
16
3
4 17
18
5
6 9
10
± ENGINE MECHANICALCYLINDER HEAD
EM±41
2620 Author: Date:
2005 SEQUOIA (RM1146U)
(4) Uniformly loosen the 22 bearing cap bolts in several
steps, in the sequence shown.
(5) Remove the 22 bearing cap bolts, 4 seal washers,
oil feed pipe, 9 bearing caps, camshaft housing
plug, oil control valve filter and 2 camshafts.
(d) Remove the RH camshafts.
(1) Bring the service bolt hole of the sub±gear upward
by turning the hexagon head portion of the exhaust
camshaft with a wrench.
(2) Secure the sub±gear to the main gear with a service
bolt.
Recommended service bolt:
Thread diameter6 mm
Thread pitch1.0 mm
Bolt length16 to 20 mm (0.63 to 0.79 in.)
HINT:
When removing the camshafts, make sure that the torsional
spring force of the sub±gear has been eliminated by the above
operation.
(3) Set the timing mark (1±dot mark) of the camshaft
main gear at approx. 10° angle by turning the hexa-
gon head portion of the exhaust camshaft with a
wrench.
(4) Uniformly loosen the 22 bearing cap bolts in several
steps, in the sequence shown.
(5) Remove the 22 bearing cap bolts, 4 seal washers,
oil feed pipe, 9 bearing caps, camshaft housing
plug, strainer and 2 camshafts.
HINT:
Arrange the bearing caps for RH and LH sides.

EM0181
Margin Thickness
EM2534
Overall Length
EM0255
EM6330
45° Carbide Cutter
Z00055
Width
± ENGINE MECHANICALCYLINDER HEAD
EM±49
2628 Author: Date:
2005 SEQUOIA (RM1146U)
(c) Check the valve head margin thickness.
Standard margin thickness: 1.0 mm (0.039 in.)
Minimum margin thickness: 0.5 mm (0.020 in.)
If the margin thickness is less than minimum, replace the valve.
(d) Check the valve overall length.
Standard overall length:
Intake95.05 mm (3.7421 in.)
Exhaust95.10 mm (3.7441 in.)
Minimum overall length:
Intake94.55 mm (3.7224 in.)
Exhaust94.60 mm (3.7244 in.)
If the overall length is less than minimum, replace the valve.
(e) Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, resurface the tip with a grinder or
replace the valve.
NOTICE:
Do not grind off more than minimum.
12. INSPECT AND CLEAN VALVE SEATS
(a) Using a 45° carbide cutter, resurface the valve seats. Re-
move only metal enough to clean the seats.
(b) Check the valve seating position.
Apply a light coat of Prussian blue (or white lead) to the
valve face. Lightly press the valve against the seat. Do not
rotate the valve.