2001 TOYOTA SEQUOIA relay
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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)
Page 227 of 4323
DI3HJ±10
± DIAGNOSTICSENGINE
DI±33
227 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Engine does not crank (Does not start)
22.Starter
23.Starter relay
24.Park/neutral position switchST±15
ST±17
DI±576
No initial combustion (Does not start)
1. ECM power source circuit
2. Fuel pump control circuit
3. Engine control module (ECM)DI±493
DI±509
IN±35
No complete combustion (Does not start)1. Fuel pump control circuitDI±509
Engine cranks normally but difficult to start
1. Starter signal circuit
2. Fuel pump control circuit
3. CompressionDI±298
DI±509
EM±3
Difficult to start with cold engine1. Starter signal circuit
2. Fuel pump control circuitDI±298
DI±509
Difficult to start with hot engine1. Starter signal circuit
2. Fuel pump control circuitDI±298
DI±509
High engine idle speed (Poor idling)1. A/C switch circuit
2. ECM power source circuit±
DI±493
Low engine idle speed (Poor idling)1. A/C switch circuit
2. Fuel pump control circuit±
DI±509
Rough idling (Poor idling)1. Compression
2. Fuel pump control circuitEM±3
DI±509
Hunting (Poor idling)1. ECM power source circuit
2. Fuel pump control circuitDI±493
DI±509
Hesitation/Poor acceleration (Poor driveability)1. Fuel pump control circuit
2. A/T faultyDI±509
±
Surging (Poor driveability)1. Fuel pump control circuitDI±509
Engine stalls soon after starting1. Fuel pump control circuitDI±509
Engine stalls during A/C operation1. A/C switch circuit
2. Engine control module (ECM)±
IN±35
Unable to refuel/Difficult to refuel1. ORVR system±
Page 249 of 4323
± 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±
Page 250 of 4323
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/OFFON: 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±
Page 252 of 4323
DI3HB±12
DI±58
± DIAGNOSTICSENGINE
252 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for the codes listed
in the table below. For details of each code, refer to the ºSee pageº under the respective ''DTC No.'' in the
DTC chart.
DTC No.
(See page)Detection ItemTrouble AreaMIL*1Memory
P0010
(DI±73)Camshaft Position ºAº Actuator
Circuit (Bank 1)Open or short in OCV circuit
OCV
ECM
P0011
(DI±79)Camshaft Position ºAº ±Timing
Over± Advanced or System Per-
formance (Bank 1)Valve timing
OCV
VVT controller assembly
ECM
P0012
(DI±79)Camshaft Position ºAº ±Timing
Over± Retarded (Bank 1)
Valve timing
OCV
VVT controller assembly
ECM
P0016
(DI±85)Crankshaft Position ± Camshaft
Position Correlation (Bank 1
Sensor A)Open or short in VVT sensor circuit
VVT sensor
ECM
P0018
(DI±85)Crankshaft Position ± Camshaft
Position Correlation (Bank 2
Sensor A)Open or short in VVT sensor circuit
VVT sensor
ECM
P0020
(DI±73)Camshaft Position ºAº Actuator
Circuit (Bank 2)Open or short in OCV circuit
OCV
ECM
P0021
(DI±79)Camshaft Position ºAº ±Timing
Over± Advanced or System Per-
formance (Bank 2)Valve timing
OCV
VVT controller assembly
ECM
P0022
(DI±79)Camshaft Position ºAº ±Timing
Over± Retarded (Bank 2)
Valve timing
OCV
VVT controller assembly
ECM
P0031
(DI±88)Oxygen (A/F) Sensor Heater
Control Circuit Low (Bank 1 Sen-
sor 1)Open in heater circuit of A/F sensor
A/F sensor heater
A/F relay
ECM
P0032
(DI±88)Oxygen (A/F) Sensor Heater
Control Circuit High (Bank 1
Sensor 1)Short in heater circuit of A/F sensor
A/F sensor heater
A/F relay
ECM
P0037
(DI±93)Oxygen Sensor Heater Control
Circuit Low (Bank 1 Sensor 2)
Open in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI relay
ECM
P0038
(DI±93)Oxygen Sensor Heater Control
Circuit High (Bank 1 Sensor 2)
Short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI relay
ECM
Page 253 of 4323
± DIAGNOSTICSENGINE
DI±59
253 Author: Date:
2005 SEQUOIA (RM1146U)P0051
(DI±88)
Oxygen (A/F) Sensor Heater
Control Circuit Low (Bank 2 Sen-
sor 1)Open in heater circuit of A/F sensor
A/F sensor heater
A/F relay
ECM
P0052
(DI±88)Oxygen (A/F) Sensor Heater
Control Circuit High (Bank 2
Sensor 1)Short in heater circuit of A/F sensor
A/F sensor heater
A/F relay
ECM
P0057
(DI±93)Oxygen Sensor Heater Control
Circuit Low (Bank 2 Sensor 2)
Open in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI relay
ECM
P0058
(DI±93)Oxygen Sensor Heater Control
Circuit High (Bank 2 Sensor 2)
Short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI relay
ECM
P0100
(DI±102)Mass or Volume Air Flow Circuit
Open or short in mass air flow meter circuit
Mass air flow meter
ECM
P0101
(DI±110)Mass or Volume Air Flow Circuit
Range/Performance ProblemMass air flow meter
P0102
(DI±102)Mass or Volume Air Flow Circuit
Low InputOpen or short in mass air flow meter circuit
Mass air flow meter
ECM
P0103
(DI±102)Mass or Volume Air Flow Circuit
High InputOpen or short in mass air flow meter circuit
Mass air flow meter
ECM
P0110
(DI±113)Intake Air Temperature Circuit
Open or short in intake air temperature sensor circuit
Intake air temperature sensor (built in mass air flow meter)
ECM
P0112
(DI±113)Intake Air Temperature Circuit
Low InputOpen or short in intake air temperature sensor circuit
Intake air temperature sensor (built in mass air flow meter)
ECM
P0113
(DI±113)Intake Air Temperature Circuit
High InputOpen or short in intake air temperature sensor circuit
Intake air temperature sensor (built in mass air flow meter)
ECM
P0115
(DI±119)Engine Coolant Temperature Cir-
cuitOpen or short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM
P0116
(DI±125)Engine Coolant Temperature Cir-
cuit Range/Performance Prob-
lem
Engine coolant temperature sensor
P0117
(DI±119)Engine Coolant Temperature Cir-
cuit Low InputOpen or short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM
P0118
(DI±119)Engine Coolant Temperature Cir-
cuit High InputOpen or short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM
P0120
(DI±127)Throttle/Pedal Position Sensor/
Switch ºAº CircuitOpen or short in throttle control motor and sensor circuit
Throttle control motor and sensor
ECM
P0121
(DI±137)Throttle/Pedal Position Sensor/
Switch ºAº Circuit Range/Perfor-
mance Problem
Throttle control motor and sensor
Page 254 of 4323
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 ControlCooling 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
Page 255 of 4323
± DIAGNOSTICSENGINE
DI±61
255 Author: Date:
2005 SEQUOIA (RM1146U)P0171
(DI±165)
System too Lean (Bank 1)
Air induction system
Injector blockage
Mass air flow meter
Engine coolant temperature sensor
Fuel pressure
Gas leakage on exhaust system
Open or short in heated oxygen sensor (bank 1 sensor 1)
circuit
Heated oxygen sensor (bank 1 sensor 1)
Heated oxygen sensor heater
EFI relay
PCV piping
ECM
P0172
(DI±165)System too Rich (Bank 1)
Injector leak, blockage
Mass air flow meter
Engine coolant temperature sensor
Ignition system
Fuel pressure
Gas leakage in exhaust system
Open or short in heated oxygen sensor (bank 1 sensor 1)
circuit
Heated oxygen sensor (bank 1 sensor 1)
ECM
P0174
(DI±165)System too Lean (Bank 2)
Air induction system
Injector blockage
Mass air flow meter
Engine coolant temperature sensor
Fuel pressure
Gas leakage on exhaust system
Open or short in heated oxygen sensor (bank 2 sensor 1)
circuit
Heated oxygen sensor (bank 2 sensor 1)
Heated oxygen sensor heater
EFI relay
PCV piping
ECM
P0175
(DI±165)System too Rich (Bank 2)
Injector leak, blockage
Mass air flow meter
Engine coolant temperature sensor
Ignition system
Fuel pressure
Gas leakage in exhaust system
Open or short in heated oxygen sensor (bank 2 sensor 1)
circuit
Heated oxygen sensor (bank 2 sensor 1)
ECM
P0220
(DI±127)Throttle/Pedal Position Sensor/
Switch ºBº CircuitThrottle control motor and sensor
ECM
P0222
(DI±127)Throttle/Pedal Position Sensor/
Switch ºBº Circuit Low Input
Throttle control motor and sensor
Short in VTA2 circuit
Open in VC circuit
ECM
P0223
(DI±127)Throttle/Pedal Position Sensor/
Switch ºBº Circuit High Input
Throttle control motor and sensor
Open in VTA2 circuit
Open in E2 circuit
VC and VTA2 circuit are short±circuited
ECM