2001 TOYOTA SEQUOIA Service Repair Manual

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Page 321 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±127
321 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0120 Throttle/Pedal Position Sensor/Switch ºAº
Circuit
DTC P0122 Throttle/Pedal Position Sensor/Switch ºAº
Circuit Lo

Page 322 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A19755A21037
Throttle Position Sensor ECM
Magnet
Magnet
IC No.2 IC No.1
VC
VTA1
E2 VTA2Throttle Position Sensor Output Voltage (V)
Fail Safe Angle
*1
Usable Range
Throttle Valve Opening Angle (deg)84

Page 323 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±129
323 Author: Date:
2005 SEQUOIA (RM1146U)DTC No.
DTC Detection Condition
Condition (a) of DTC P0120, P0122, P0123, P0220, P0222 or P0223 continues
for 2 sec.
(Open or s

± DIAGNOSTICSENGINE
DI±129
323 Author: Date:
2005 SEQUOIA (RM1146U)DTC No.
DTC Detection Condition
Condition (a) of DTC P0120, P0122, P0123, P0220, P0222 or P0223 continues
for 2 sec.
(Open or short in the throttle control motor and sensor circuit)Trouble Area
P0120
Detection conditions for DTCs P0122 and P0123 are not satis-
fied but condition (a) is satisfied
(a) VTA1 is º0.2 V or lessº or VTA1 is º4.8 V or moreºOpen or short in throttle control motor and sensor circuit
Throttle control motor and sensor
ECM
P0122(a) VTA1 is 0.2 V or less
Short in throttle control motor and sensor circuit
Throttle control motor and sensor
Short in VTA1 circuit
Open in VC circuit
ECM
P0123(a) VTA1 is 4.8 V or more
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
P0220
Detection conditions for DTCs P0222 and P0223 are not satis-
fied but condition (a) is satisfied
(a) VTA2 is º0.5 V or lessº or VTA2 is º4.8 V or moreºThrottle control motor and sensor
ECM
P0222(a) VTA2 is 0.5 V or less
Throttle control motor and sensor
Short in VTA2 circuit
Open in VC circuit
ECM
P0223(a) VTA2 is º4.8 V or moreº and
VTA1 is º0.2 V or moreº and VTA1 is º1.8 V or lessº
Throttle control motor and sensor
Open in VTA2 circuit
Open in E2 circuit
VC and VTA2 circuit are short±circuited
ECM
P2135
Condition (a) continues for 0.5 sec. or more, or
condition (b) continues for 0.4 sec. or more:
(a) Difference between VTA1 and VTA2 is 0.02 V or less
(b) VTA1 is º0.2 V or lessº and VTA2 is º0.5 V or lessºVTA1 and VTA2 circuit are short±circuited
Throttle control motor and sensor
ECM
HINT:
After confirming DTCs, use the hand±held tester or the OBD II scan tool to confirm the throttle valve
opening percentage and closed throttle position switch condition.
THROTTLE POS means the VTA1 signal and the THROTTLE POS #2 means the VTA2 signal.
Reference (Normal condition):
Tester displayAccelerator pedal fully releasedAccelerator pedal fully depressed
THROTTLE POS10 to 24%66 to 98%
THROTTLE POS #22.1 to 3.1 V4.5 to 5.5 V

Page 324 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±130
± DIAGNOSTICSENGINE
324 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
The ECM uses throttle position sensor to monitor the throttle valve opening angle.
(a) There is an expecte

DI±130
± DIAGNOSTICSENGINE
324 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
The ECM uses throttle position sensor to monitor the throttle valve opening angle.
(a) There is an expected specific voltage difference between VTA1 and VTA2 for each throttle opening
angle.
If the difference between VTA1 and VTA2 is incorrect the ECM interprets this as a fault and will set a
DTC.
(b) VTA1 and VTA2 each have a specific voltage operating range.
If VTA1 or VTA2 is out of the normal operating range the ECM interprets this as a fault and will set a
DTC.
(c) VTA1 and VTA2 should never be close to the same voltage levels.
If VTA1 is within the range of ± 0.02 V of VTA2 the ECM interprets this as a short circuit in the throttle
position sensor system and will set a DTC.
FAIL SAFE
If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle
control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by
the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (inter-
mittent fuel±cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the
vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail±safe operation will stop
and the system will return to normal condition.
MONITOR STRATEGY
P0120Throttle position sensor (sensor 1) range check
(Fluttering)
P0122Throttle position sensor (sensor 1) range check
(Low voltage)
P0123Throttle position sensor (sensor 1) range check
(High voltage)
Related DTCsP0220Throttle position sensor (sensor 2) range check
(Fluttering)
P0222Throttle position sensor (sensor 2) range check
(Low voltage)
P0223Throttle position sensor (sensor 2) range check
(High voltage)
P2135Throttle position sensor range check (Correla-
tion)
Required sensors/componentsThrottle position sensor
Frequency of operationContinuous
Duration
Accelerator pedal ON: 2 sec.
Accelerator pedal OFF: 10 sec.
P2135: 0.5 sec. or 0.4 sec.
MIL operationImmediate
Sequence of operationNone

Page 325 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±131
325 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these
DTCs are not presentSee page DI±18
Throttle control motor pow

Page 326 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A19212
T14
Throttle Control Motor
and Position Sensor
4
6
1
2G±W
G±B
P±L
B±Y28
23
19
20
4
5
17 E8
P
VECM
E2
VC
VTA2
VTA1 3
5
(Shielded)
L±RM±
M+
GE01 E8
E8
E8
E8
E8
E8 DI±132
± DIAGNOSTICSENG

Page 327 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±133
327 Author: Date:
2005 SEQUOIA (RM1146U)
1 Connect hand±held tester, and read the voltage for throttle position sensor data.
PREPARATION:
(a) Enter the following menu

Page 328 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A21022
Throttle Control Motor and Sensor
VC VTA2VTA1
E2 Wire Harness Side
T14
Front View
B17412VC
E2
E8ECM Connector
VTA2
VTA1
DI±134
± DIAGNOSTICSENGINE
328 Author: Date:
2005 SEQUOIA (RM1146U)

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