1998 TOYOTA LAND CRUISER Factory Repair Manual

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Page 1377 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A21022
Wire Harness Side:
A14
Accelerator Pedal Position Sensor
EP2
VPA2
EP1
VCP2VPA1VCP1
A21033
E9
ECM Connector
VPA2
VCPAVPA
EPA2EPA
VCP2
DI-328
- DIAGNOSTICSENGINE
521 Author: Date:
2004 LAND CRU

Page 1378 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19521A19757
EPA (-)
VCPA (+)
EPA2 (-) VCP2 (+)
Accelerator Pedal
Position Sensor
Connector
E9
A14
- DIAGNOSTICSENGINE
DI-329
522 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check voltage betwee

Page 1379 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-330
- DIAGNOSTICSENGINE
523 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check if DTC output recur?
PREPARATION:
(a) Connect the OBD II scan tool to the DLC3.
(b) Disconnect the battery termin

Page 1380 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - DIAGNOSTICSENGINE
DI-331
524 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P2121 Throttle/Pedal Position Sensor/Switch ºDº
Circuit Range/Performance
HINT:
This is repair procedure for the ºac

- DIAGNOSTICSENGINE
DI-331
524 Author: Date:
2004 LAND CRUISER (RM1071U)
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-318.
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 deviate 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
DIC2T-01

Page 1381 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual FI7052DepressedReleased
DI-332
- DIAGNOSTICSENGINE
525 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the fol

Page 1382 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A21022
Wire Harness Side:
A14
Accelerator Pedal Position Sensor
EP2
VPA2
VPA1
VCP2VPA1VCP1
A21033
E9
ECM Connector
VPA2
VCPAVPA
EPA2EPA
VCP2
- DIAGNOSTICSENGINE
DI-333
526 Author: Date:
2004 LAND CR

Page 1383 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A21036
E9VPA VPA2
EPA2 EPA
ECM Connector
DI-334
- DIAGNOSTICSENGINE
527 Author: Date:
2004 LAND CRUISER (RM1071U)
OBD II scan tool (excluding hand-held tester):
1 Check voltage between terminals V

Page 1384 of 3115

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