2001 TOYOTA SEQUOIA Service Repair Manual

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Page 577 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual A19759
A37
Accelerator Pedal Position Sensor
VPA1
EP1
VCP1G±W
L±YECM
E4
2119
VPA2
EP2
VCP26
5
4
3
2
1G±R
G±B
L±B
L±RE4
E4
E4
E4
E426
27 18
20
VCP2 EPA2 VPA2 VCPAEPAVPA
± DIAGNOSTICSENGINE
DI±3

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TOYOTA SEQUOIA 2001 Service Repair Manual FI7052DepressedReleased
DI±376
± DIAGNOSTICSENGINE
570 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data record

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TOYOTA SEQUOIA 2001 Service Repair Manual A21022
Wire Harness Side:
A37
Accelerator Pedal Position Sensor
VCP2
EPA2
VPA2
VCPAEPAVPA
B17417
E4VPA2
VCPAVPA
EPA2
EPAVCP2
± DIAGNOSTICSENGINE
DI±377
571 Author: Date:
2005 SEQUOIA (RM1146U)
2

Page 580 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17448
EPA (±)VCPA (+)
EPA2 (±)
VCP2 (+) Accelerator Pedal
Position Sensor
Connector
E4
A37
DI±378
± DIAGNOSTICSENGINE
572 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check voltage between termin

Page 581 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±379
573 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check whether DTC output recurs (DTC P2120, P2122, P2123, P2125, P2127,
P2128 or P2138)
PREPARATION:
(a) Connect the hand±h

Page 582 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±380
± DIAGNOSTICSENGINE
574 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2121 Throttle/Pedal Position Sensor/Switch ºDº
Circuit Range/Performance
HINT:
This is repair procedure for the ºaccel

DI±380
± DIAGNOSTICSENGINE
574 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2121 Throttle/Pedal Position Sensor/Switch ºDº
Circuit Range/Performance
HINT:
This is repair procedure for the ºaccelerator pedal position sensorº.
CIRCUIT DESCRIPTION
Refer to DTC P2120 on page DI±370.
DTC No.DTC Detecting ConditionTrouble Area
P2121
Conditions (a) and (b) continue for 0.5 seconds:
(a) Difference between VPA and VPA2 exceeds the threshold
(b) IDL is OFFAccelerator pedal position sensor circuit
Accelerator pedal position sensor
ECM
MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal
position sensor has 2 sensor elements/signal outputs: VPA1 and VPA2. VPA1 is used to detect the actual
accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA1. When
the difference between the voltage outputs of VPA1 and VPA2 deviates from the standard, the ECM con-
cludes the accelerator pedal position sensor has a malfunction. The ECM turns on the MIL and a DTC is
set.
FAIL SAFE
The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in ei-
ther of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor
circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator
pedal opening to allow the vehicle to continue driving.
If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed.
In this case, the throttle valve will remain closed as if the engine is idling.
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
Related DTCsP2121Accelerator position sensor (rationality)
Required sensors/componentsAccelerator position sensor
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
DID8H±01

Page 583 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual FI7052DepressedReleased
± DIAGNOSTICSENGINE
DI±381
575 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC i

Page 584 of 4323

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