2001 TOYOTA SEQUOIA service

± DIAGNOSTICSENGINE
DI±51
245 Author: Date:
2005 SEQUOIA (RM1146U)THRTL MOT (CLS)
Throttle motor duty ratio (close):
Min.: 0 %, Max.: 100 %'ETCS service data
O2S B1 S2
Heated oxygen sensor output volt-
age for bank 1 sensor 2:
Min.: 0 V, Max.: 1.275 V0.1 to 0.9 V:
Driving 44 mph (70 km/h)
Performing the INJ VOL or A/F
CONTROL function of the ACTIVE
TEST enables the technician to
check voltage output of the sensor
O2S B2 S2
Heated oxygen sensor output volt-
age for bank 1 sensor 2:
Min.: 0 V, Max.: 1.275 V0.1 to 0.9 V:
Driving 44 mph (70 km/h)
Performing the INJ VOL or A/F
CONTROL function of the ACTIVE
TEST enables the technician to
check voltage output of the sensor
AFS B1 S1
A/F sensor output voltage for bank
1 sensor 1:
Min.: 0 V, Max.: 7.999 V
2.8 to 3.8 V: Idling
Performing the INJ VOL or A/F
CONTROL function of the ACTIVE
TEST enables the technician to
check voltage output of the sensor
AFS B2 S1
A/F sensor output voltage for bank
1 sensor 1:
Min.: 0 V, Max.: 7.999 V
2.8 to 3.8 V: Idling
Performing the INJ VOL or A/F
CONTROL function of the ACTIVE
TEST enables the technician to
check voltage output of the sensor
TOTAL FT #1
Total fuel trim of bank 1
Average value for fuel trim system
of bank 1:
Min.: ±0.5, Max.: 1,496
±0.2 to 0.2: Idling'
TOTAL FT #2
Total fuel trim of bank 1
Average value for fuel trim system
of bank 1:
Min.: ±0.5, Max.: 1,496
±0.2 to 0.2: Idling'
SHORT FT #1Short±term fuel trim of bank 1:
Min.: ±100 %, Max.: 99.2%0 ± 20 %
This item the short±term fuel com-
pensation used to maintain the
air±fuel ratio at stoichiometric air±
fuel ratio
SHORT FT #2Short±term fuel trim of bank 1:
Min.: ±100 %, Max.: 99.2%0 ± 20 %
This item the short±term fuel com-
pensation used to maintain the
air±fuel ratio at stoichiometric air±
fuel ratio
LONG FT #1Long±term fuel trim of bank 1:
Min.: ±100 %, Max.: 99.2 %0 ± 20 %
This item the overall fuel com-
pensation carried out in long±term
to compensate a continual devi-
ation of the short±term fuel trim
from the central value
LONG FT #2Long±term fuel trim of bank 1:
Min.: ±100 %, Max.: 99.2 %0 ± 20 %
This item the overall fuel com-
pensation carried out in long±term
to compensate a continual devi-
ation of the short±term fuel trim
from the central value
FUEL SYS #1
Fuel system status (Bank1):
OL or CL or OL DRIVE or
OL FAULT or CL FAULT
CL: Idling after warming up

OL (Open Loop): Has not yet sa-
tisfied conditions to go closed
loop

CL (Closed Loop): Using heated
oxygen sensor as feedback for
fuel control.

OL DRIVE: Open loop due to
driving conditions (fuel enrich-
ment)

OL FAULT: Open loop due to de-
tected system fault

CL FAULT: Closed loop but
heated oxygen sensor, which
used for fuel control malfunction-
ing

DI±52
± DIAGNOSTICSENGINE
246 Author: Date:
2005 SEQUOIA (RM1146U)FUEL SYS #2
Fuel system status (Bank1):
OL or CL or OL DRIVE or
OL FAULT or CL FAULT
CL: Idling after warming up

OL (Open Loop): Has not yet sa-
tisfied conditions to go closed
loop

CL (Closed Loop): Using heated
oxygen sensor as feedback for
fuel control.

OL DRIVE: Open loop due to
driving conditions (fuel enrich-
ment)

OL FAULT: Open loop due to de-
tected system fault

CL FAULT: Closed loop but
heated oxygen sensor, which
used for fuel control malfunction-
ing
O2FT B1 S2
Short±term fuel trim associated
with the bank 1 sensor 2:
Min.: ±100 %, Max.: 99.2 %
0 ± 20 %Same as SHORT FT #1
O2FT B2 S2
Short±term fuel trim associated
with the bank 1 sensor 2:
Min.: ±100 %, Max.: 99.2 %
0 ± 20 %Same as SHORT FT #1
AF FT B1 S1
Short±term fuel trim associated
with the bank 1 sensor 1:
Min.: 0, Max.: 1.999

Value less than 1 (0.000 to
0.999) = Lean

Stoichiometric air±fuel ratio=1

Value greater than 1 (1.001 to
1.999) = RICH
'
AF FT B2 S1
Short±term fuel trim associated
with the bank 1 sensor 1:
Min.: 0, Max.: 1.999

Value less than 1 (0.000 to
0.999) = Lean

Stoichiometric air±fuel ratio=1

Value greater than 1 (1.001 to
1.999) = RICH
'
CAT TEMP B1S1
Catalyst temperature (Bank 1,
Sensor 1):
Min.: ±40, Max.: 6,513.5 C
''
CAT TEMP B2S1
Catalyst temperature (Bank 1,
Sensor 1):
Min.: ±40, Max.: 6,513.5 C
''
CAT TEMP B1S2
Catalyst temperature (Bank 1,
Sensor 2):
Min.: ±40, Max.: 6,513.5 C
''
CAT TEMP B2S2
Catalyst temperature (Bank 1,
Sensor 2):
Min.: ±40, Max.: 6,513.5 C
''
INI COOL TEMPInitial engine coolant temperature:
Min.: ±40C, Max.: 140CClose to ambient air temperatureService data
INI INTAKE TEMPInitial intake air temperature:
Min.: ±40C, Max.: 140CClose to ambient air temperatureService data
INJ VOLInjection volume (cylinder 1):
Min.: 0 ml, Max.: 2.048 ml0 to 0.5 mlQuantity of fuel injection volume
for 10 times
STARTER SIGStarter signal: ON or OFFON: Cranking'
PS SWPower steering signal:
ON or OFFON: Power steering operation'
PS SIGNALPower steering signal:
ON or OFFON: When steering wheel first
turned after ignition switch turned
to ONThis signal status usually ON until
ignition switch turned to OFF
CTP SWClosed throttle position switch:
ON or OFF
ON: Throttle fully closed

OFF: Throttle open'

± DIAGNOSTICSENGINE
DI±53
247 Author: Date:
2005 SEQUOIA (RM1146U)A/C SIG
A/C signal: ON or OFFON: A/C ON'
ELECT LOAD SIGElectrical load signal:
ON or OFFON: Headlights or defogger is
turned ON'
STOP LIGHT SWStop lamp switch:
ON or OFFON: brake pedal is depressed.'
+BM
Whether or not electric throttle
control system power inputted:
ON or OFF
ON: Idling'
+BM VOLTAGE+BM voltage:
Min.: 0, Max.: 19.9210 to 15 V: IdlingETCS service data
BATTERY VOLTAGEBattery voltage:
Min.: 0 V, Max.: 65.535 V9 to 14 V: Idling'
ACTUATOR POWERActuator power supply:
ON or OFFON: IdlingETCS service data
ATM PRESSUREAtmospheric pressure:
Min.: 0 kPa, Max.: 150 kPaEquivalent to atmospheric pres-
sure (absolute pressure)'
SECOND AIR VSVSecondary air injection system
statusON: Secondary air injection sys-
tem operation'
ACT VSVA/C cut status for Active Test:
ON or OFF'Active Test support data
EVAP (Purge) VSVVSV status for EVAP control:
ON or OFF'Active Test support data
FUEL PUMP / SPDFuel pump/speed status:
ON or OFF'Active Test support data
VVT CTRL B1VVT control status:
ON or OFF'Active Test support data
VVT CTRL B2VVT control status:
ON or OFF'Active Test support data
VACUUM PUMP
Key±off EVAP system pump sta-
tus:
ON or OFF
'Active Test support data
EVAP VENT VAL
Key±off EVAP system vent valve
status:
ON or OFF
'Active Test support data
TC/TE1TC and TE1 terminal of DLC3:
ON or OFF''
VVTL AIM ANGL #1VVT aim angle (bank 1):
Min.: 0 %, Max.: 100 %0 %: IdlingVVT duty signal value during intru-
sive operation
VVTL AIM ANGL #2VVT aim angle (bank 1):
Min.: 0 %, Max.: 100 %0 %: IdlingVVT duty signal value during intru-
sive operation
VVT CHNG ANGL #1VVT change angle:
Min.: 0FR, Max.: 60FR0 to 5 FR: IdlingDisplacement angle during intru-
sive operation
VVT CHNG ANGL #2VVT change angle:
Min.: 0FR, Max.: 60FR0 to 5 FR: IdlingDisplacement angle during intru-
sive operation
VVT OCV DUTY B1VVT OCV operation duty:
Min.: 0 %, Max.: 100 %0 %: IdlingRequested duty value for intrusive
operation
VVT OCV DUTY B2VVT OCV operation duty:
Min.: 0 %, Max.: 100 %0 %: IdlingRequested duty value for intrusive
operation
FC IDLFuel cut idle:
ON or OFFON: Fuel cut operation
FC IDL = ºONº when throttle valve
fully closed and engine speed over
2,800 rpm

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'

A23474
Purge VSV
(Vacuum Switching Valve)
EVAP Hose
(To Throttle Body)
EVAP Hose
(From Canister) Location of EVAP (Evaporative Emission) system:Vent ValveCanister
Pressure Sensor
Vacuum Pump
Purge Line
Fuel Tank
Air Inlet Port Breeding
PipeFuel Tank Cap Refueling ValvePump Module
Air Filter
A23668
EVAP System Circuit:
Intake Manifold
Purge VSV
Cut±Off Valve Roll±Over Valve
CanisterAir Filterfuel tank cap
Service Port
Air Cleaner
Restrictor (0.08 inch)
Refueling Valve Throttle Valve
ECM
Soak Timer
Pump Module
Fuel Tank
± DIAGNOSTICSENGINE
DI±461
655 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT DESCRIPTION
While the engine is running, if a predetermined condition (closed±loop, etc.) is met, the purge VSV is opened
by the ECM and stored fuel vapors in the canister are purged to the intake manifold. The ECM changes the
duty cycle ratio of the purge VSV to control purge flow volume.
The purge flow volume is also determined by the intake manifold pressure.
Atmospheric pressure is allowed
into the canister through the vent valve to ensure that the purge flow is maintained when the negative pres-
sure (vacuum) is applied to the canister.
The following two monitors run to confirm appropriate EVAP system operation.

± DIAGNOSTICSENGINE
DI±463
657 Author: Date:
2005 SEQUOIA (RM1146U)Components
Operations
CanisterContains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank.
Cut±off valveLocated in fuel tank. Valve floats and closes when fuel tank is 100 % full.
Purge VSV (Vacuum
Switching Valve)Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In order
to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge volume to intake
manifold controlled by purge VSV duty cycle ratio (current±carrying time). (Open: ON, Close: OFF)
Refueling valve
Controls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, spring and restrictor (diameter: 0.08
inch). When fuel vapor and pressure inside fuel tank increase, valve opens. While EVAP purged, valve closes and re-
strictor prevents large amount of vacuum from affecting pressure in fuel tank. Valve opened while refueling. When valve
open, adding fuel into fuel tank possible.
Roll±over valveLocated in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out.
Service portUsed for connecting vacuum gauge for inspecting EVAP system.
Soak timerBuilt into ECM. To ensure accurate EVAP monitor, measures 5 hours* after ignition switch turned to OFF. This allows
fuel to cool down, stabilizing Fuel Tank Pressure (FTP). When approx. 5 hours
* elapsed, ECM activates.
Pump moduleConsists of (a) to (d) below. Pump module cannot be disassembled.
(a) Vent valve
Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When, ECM turns valve OFF, EVAP
system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing purge VSV,
turning on vent valve (closed) and operating vacuum pump (refer to fig. 1).
(b) Pressure sensorIndicates pressure as voltages. ECM supplies regulated 5 V to pressure sensor, and uses feedback from sensor to
monitor EVAP system pressure (refer to fig 2).
(c) Vacuum pumpCreates negative pressure (vacuum) in EVAP system for leak check.
(d) 0.02 inch orificeHas opening with 0.02 inch diameter. Vacuum produced through orifice by closing purge VSV, turning off vent valve and
operating vacuum pump, to monitor 0.02 inch leak pressure. 0.02 inch leak pressure indicates small leak of EVAP.
HINT:
*:If the engine coolant temperature is not below 35C after 5 hours after the ignition switch is turned off, the
monitor check starts 2 hours later. If it is still not below 35C 7 hours after the ignition switch is turned off,
the monitor check starts 2.5 hours later.

A23477SST
Pressure Gauge
Pressure
B06546
± DIAGNOSTICSENGINE
DI±487
681 Author: Date:
2005 SEQUOIA (RM1146U)
27 Correctly reinstall or replace fuel tank cap.
HINT:

When reinstalling the fuel tank cap, tighten it until a few click sounds are heard.

When replacing the fuel tank cap, use a fuel tank cap that meets OEM specifications, and install it until
a few click sounds are heard.
NEXT Go to step 37.
28 Replace fuel tank cap.
HINT:
When installing the fuel tank cap, tighten it until a few click sounds are heard.
NEXT Go to step 37.
29 Repair EVAP leak part.
(a) Prepare a rubber hose with a 15 to 18.5 mm inside diame-
ter.
(b) Reinstall the fuel tank cap.
(c) Disconnect the atmospheric side hose of the pump mod-
ule.
(d) Connect the rubber tube to the pump module.
(e) Using SST, pinch the rubber tube to close the canister
passage to air.
SST 00002±6872A
(f) Connect a pressure gauge (SST) to the service port
(green cap near the air cleaner box).
(g) Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28
mmHg).
(h) Apply soapy water to the piping and connecting parts of
the EVAP system. Look for areas where bubbles appear.
This indicates leaking points.
(i) Repair or replace leaking point.
HINT:

If the system has leaks, a whistling sound will be heard.

Disconnect the hose between the canister and the fuel
tank from the canister. Close the canister hose connected
to the fuel tank, and conduct an inspection. In this way, the
fuel tank can be excluded as an area suspected of caus-
ing fuel leaks.
NEXT Go to step 36.



D14152
DTC was set.
0.5 sec. 0.5 sec. 0.5 sec.
 : Freeze frame data which can be read
D14151
DLC3
1314 1516 12 11 10 9 12345678
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±563
757 Author: Date:
2005 SEQUOIA (RM1146U)
FREEZE FRAME DATA
Freeze frame data records the engine conditions (fuel system,
calculated load, engine coolant temperature, fuel trim, engine
speed, vehicle speed, etc.) 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, and other data
from the time the malfunction occurred.
The hand±held tester records freeze frame data in five different
instances: 1) 3 times before the DTC is set, 2) once when the
DTC is set, and 3) once after the DTC is set. These data can be
used to simulate the vehicle's condition around the time when
the malfunction occurred. The data may help find the cause of
the malfunction, or judge if the DTC is being caused by a tempo-
rary malfunction or not.
DLC3 (Data Link Connector 3)
The vehicle's ECM uses the ISO 15765±4 for communication
protocol. The terminal arrangement of the DLC3 complies with
SAE J1962 and matches the ISO 15765±4 format.
HINT:
Connect the cable of the hand±held tester to the DLC3, turn the
ignition switch ON and attempt to use the hand±held tester. If
the screen displays UNABLE TO CONNECT TO VEHICLE, a
problem exists in the vehicle side or the tester side.
If the communication is normal when the tool is connected to
another vehicle, inspect the DLC3 on the original vehicle.
If the communication is still impossible when the tool is con-
nected to another vehicle, the problem is probably in the tool it-
self. Consult the Service Department listed in the tool's instruc-
tion manual.
SymbolTerminal No.NameReference terminalResultCondition
SIL7Bus º+º line5 ± Signal groundPulse generationDuring transmission
CG4Chassis groundBody groundBelow 1 WAlways
SG5Signal groundBody groundBelow 1 WAlways
BAT16Battery positiveBody ground11 to 14 VAlways
CANH6HIGH±level CAN
bus lineCANL54 to 69 WIG switch OFF
CANH6HIGH±level CAN
bus lineBattery positive1 MW or higherIG switch OFF
CANH6HIGH±level CAN
bus lineCG1 kW or higherIG switch OFF
CANL14LOW±level CAN
bus lineBattery positive1 MW or higherIG switch OFF
CANL14LOW±level CAN
bus lineCG1 kW or higherIG switch OFF