2001 TOYOTA SEQUOIA fuel

± 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'

± DIAGNOSTICSENGINE
DI±55
249 Author: Date:
2005 SEQUOIA (RM1146U)DIST DTC CLEAR
Distance after DTC cleared:
Min.: 0 km/h, Max.: 65535 km/hEquivalent to drive distance after
DTCs were erased'
WU CYC DTC CLEARWarm±up cycle after DTC cleared:
Min.: 0, Max.: 255'Number of warm±up cycles after
DTC cleared
MODEL CODEModel code:'Identifying the model code:
UCK30 (2WD), UCK40 (4WD)
ENGINE TYPEEngine type:'Identifying the engine type:
2UZFE
CYLINDER NUMBERCylinder number:
Min.: 0, Max.: 255'Identifying the cylinder number:
8
TRANSMISSIONTransmission type:'Identifying the transmission type:
ECT(5AT)
DESTINATIONDestination'Identifying the destination:
A (America)
MODEL YEARModel year:
Min.: 0, Max.: 255'Identifying the model year:
200#
SYSTEMSystem identification'Identifying the engine system:
GASLIN (gasoline engine)
AI STATUSAI operation prohibit:
OK or NGOK
*1: If no idling conditions are specified, the transmission gear selector lever should be in the N or P position,
and the A/C switch and all accessory switches should be OFF.
2. ACTIVE TEST
HINT:
Performing an ACTIVE TEST enables components including the relays, VSV (Vacuum Switching Valve),
and actuators, to be operated without removing any parts. The ACTIVE TEST can be performed with a
hand±held tester. Performing an ACTIVE TEST as the first step of troubleshooting is one method of shorten-
ing diagnostic time.
DATA LIST can be displayed during ACTIVE TESTs.
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST.
(e) Perform the ACTIVE TEST by referring to the table below.
Hand±held Tester DisplaysTest DetailsControl RangesDiagnostic Notes
INJ VOLChange injection volumeBetween ±12 % and 25 %

All injectors tested at the same
time

Perform test at less than 3,000
rpm

Injection volume can be changed
in 1 % graduations within control
range
A/F CONTROLChange injection volumeLower by 12.5 % or increase by 25
%

Perform test at less than 3,000
rpm

A/F CONTROL enables checking
and graphing of A/F (Air Fuel Ra-
tio) sensor and Heated Oxygen
(HO2) sensor voltage outputs

To conduct test, select following
menu items: ACTIVE TEST / A/F
CONTROL / USER DATA / AFS
B1S1 and O2S B1S2, and press
YES and ENTER followed by F4
EVAP VSV (ALONE)Activate EVAP VSV controlON/OFF±

DI±56
± DIAGNOSTICSENGINE
250 Author: Date:
2005 SEQUOIA (RM1146U) VVT CTRL B1
Turn on and off OCV
(Oil Control Valve)ON/OFF

Engine stalls or idles roughly
when OCV turned ON

Normal engine running or idling
when OCV off
VVT CTRL B2Turn on and off OCV
(Oil Control Valve)ON/OFF

Engine stalls or idles roughly
when OCV turned ON

Normal engine running or idling
when OCV off
A/C CUT SIGControl A/C cut signalON/OFF±
FUEL PUMP/SPDActivate fuel pump (C/OPN Relay)ON/OFF±
TC/TE1Turn on and off TC and TE1 con-
nectionON/OFF
ON: TC and TE1 connected

OFF: TC and TE1 disconnected
FC IDL PROHBTProhibit idling fuel cut controlON/OFF±
ETCS OPEN SLOWThrottle actuatorON: throttle valve opens slowly
This test is possible when the fol-
lowing conditions are met:

Ignition switch ON

Engine does not start

Fully depressing accelerator ped-
al (APP: 58 degrees or more)
ETCS CLOSE SLOWThrottle actuatorON: throttle valve closes slowlySame as above
ETCS OPEN FASTThrottle actuatorON: throttle valve opens fastSame as above
ETCS CLOSE FASTThrottle actuatorON: throttle valve closes fastSame as above
FUEL CUT #1Cylinder #1 injector fuel cutON/OFFThis test is possible during vehicle
stopping and engine idling.
FUEL CUT #2Cylinder #2 injector fuel cutON/OFFSame as above
FUEL CUT #3Cylinder #3 injector fuel cutON/OFFSame as above
FUEL CUT #4Cylinder #4 injector fuel cutON/OFFSame as above
FUEL CUT #5Cylinder #5 injector fuel cutON/OFFSame as above
FUEL CUT #6Cylinder #6 injector fuel cutON/OFFSame as above
FUEL CUT #7Cylinder #7 injector fuel cutON/OFFSame as above
FUEL CUT #8Cylinder #8 injector fuel cutON/OFFSame as above
VENT VALVE (ALONE)Activate vent valve
(built into pump module)ON/OFF±
VCUUM PUMPActivate vacuum pump
(built into pump module)ON/OFF±

± DIAGNOSTICSENGINE
DI±57
251 Author: Date:
2005 SEQUOIA (RM1146U)
3. SYSTEM CHECK
HINT:
Performing a SYSTEM CHECK enables the system, which consists of multiple actuators, to be operated
without removing any parts. In addition, it can show whether or not any DTCs are set, and can detect poten-
tial malfunctions in the system. The SYSTEM CHECK can be performed with a hand±held tester.
(a) Connect a hand±held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester ON.
(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK.
(e) Perform the SYSTEM CHECK by referring to the table below.
Hand±held Tester DisplaysTest DetailsRecommended Fuel TemperaturesDiagnostic Notes
EVAP SYS CHECK
(AUTO OPERATION)Perform 5 steps in order to oper-
ate EVAP key±off monitor auto-
matically
35C (95F) or less

If no DTCs in PENDING CODE
after performing this test, system
functioning normally

Refer to EVAP Inspection Proce-
dure on page DI±460
EVAP SYS CHECK
(MANUAL OPERATION)Perform 5 steps in order to oper-
ate EVAP key±off monitor manual-
ly
35C (95F) or less

Used to detect malfunctioning
parts

Refer to EVAP Inspection Proce-
dure on page DI±460
AI INJ CHECK
(AUTO OPERATION)Perform 6 steps in order to oper-
ate air injection system automati-
cally
±

If no DTCs in PENDING CODE
after performing this test, system
functioning normally
AI INJ CHECK
(MANUAL OPERATION)Perform 8 operations in order to
operate air injection system moni-
tor manually
±
Used to detect malfunctioning
parts

DI±60
± DIAGNOSTICSENGINE
254 Author: Date:
2005 SEQUOIA (RM1146U)P0122
(DI±127)
Throttle/Pedal Position Sensor/
Switch ºAº Circuit Low Input

Short in throttle control motor and sensor circuit

Throttle control motor and sensor

Short in VTA1 circuit

Open in VC circuit

ECM

P0123
(DI±127)Throttle/Pedal Position Sensor/
Switch ºAº Circuit High Input

Open in throttle control motor and sensor circuit

Throttle control motor and sensor

Open in VTA1 circuit

Open in E2 circuit

VC and VTA1 circuit are short±circuited

ECM

P0125
(DI±139)Insufficient Coolant Temperature
for Closed Loop Fuel Control
Cooling system

Engine coolant temperature sensor

Thermostat

P0128
(DI±142)Coolant Thermostat (Coolant
Temperature Below Thermostat
Regulating Temperature)
Thermostat

Cooling system

Engine coolant temperature sensor

ECM
P0136
(DI±146)Oxygen Sensor Circuit Malfunc-
tion (Bank 1 Sensor 2)

Open or short in HO2 sensor (sensor 2) circuit

HO2 sensor (sensor 2)

HO2 sensor heater (sensor 2)

Air±Fuel Ratio (A/F) sensor (sensor 1)

EFI relay

Gas leakage from exhaust system

P0137
(DI±146)Oxygen Sensor Circuit Low Volt-
age (Bank 1 Sensor 2)

Open in HO2 sensor (sensor 2) circuit

HO2 sensor (sensor 2)

HO2 sensor heater (sensor 2)

EFI relay

Gas leakage from exhaust system

P0138
(DI±146)Oxygen Sensor Circuit High Volt-
age (Bank 1 Sensor 2)
Short in HO2 sensor (sensor 2) circuit

HO2 sensor (sensor 2)

ECM internal circuit malfunction

P0156
(DI±146)Oxygen Sensor Circuit Malfunc-
tion (Bank 2 Sensor 2)

Open or short in HO2 sensor (sensor 2) circuit

HO2 sensor (sensor 2)

HO2 sensor heater (sensor 2)

Air±Fuel Ratio (A/F) sensor (sensor 1)

EFI relay

Gas leakage from exhaust system

P0157
(DI±146)Oxygen Sensor Circuit Low Volt-
age (Bank 2 Sensor 2)

Open in HO2 sensor (sensor 2) circuit

HO2 sensor (sensor 2)

HO2 sensor heater (sensor 2)

EFI relay

Gas leakage from exhaust system

P0158
(DI±146)Oxygen Sensor Circuit High Volt-
age (Bank 2 Sensor 2)
Short in HO2 sensor (sensor 2) circuit

HO2 sensor (sensor 2)

ECM internal circuit malfunction