1998 TOYOTA LAND CRUISER Factory Repair Manual

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Page 1369 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-320
- DIAGNOSTICSENGINE
513 Author: Date:
2004 LAND CRUISER (RM1071U)DTC No.
DTC Detection Condition
(Open or short in accelerator pedal position sensor circuit)Main trouble Area
P2120Condition

DI-320
- DIAGNOSTICSENGINE
513 Author: Date:
2004 LAND CRUISER (RM1071U)DTC No.
DTC Detection Condition
(Open or short in accelerator pedal position sensor circuit)Main trouble Area
P2120Condition (a) continues for 0.5 seconds or more:
(a) VPA 0.2 V and VPA2 0.97 deg, or VPA 4.8 VAccelerator pedal position sensor
ECM
P2122
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA 0.2 V
(b) VPA2 0.97 degAccelerator pedal position sensor
VCPA circuit open
VPA circuit open or ground short
ECM
P2123Condition (a) continues for 2.0 seconds or more:
(a) VPA 4.8 VAccelerator pedal position sensor
EPA circuit open
ECM
P2125
Condition (a) continues for 0.5 seconds or more:
(a) VPA2 0.5 V and VPA 0.97 deg, or VPA2 4.8 V and
0.2 V VPA 3.45 VAccelerator pedal position sensor
ECM
P2127
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA2 0.5 V
(b) VPA 0.97 degAccelerator pedal position sensor
VCP2 circuit open
VPA2 circuit open or ground short
ECM
P2128
Condition (a) and (b) continues for 2.0 seconds or more:
(a) VPA2 4.8 V
(a) 0.2 V VPA 3.45 VAccelerator pedal position sensor
EPA circuit open
ECM
P2138
Condition (a) or (b) continues for 2.0 seconds or more:
(a) |VPA - VPA2| 0.02 V
(b) VPA 0.2 V and VPA2 0.5 VVPA and VPA2 circuit are short circuited
Accelerator pedal position sensor
ECM
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138 use the OBD II scan tool
or the hand-held tester to confirm the accelerator pedal opening percentage.
Accelerator pedal position expressed as voltage
Trouble areaAccelerator pedal completely releasedAccelerator pedal fully depressedTrouble area
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
VC circuit open0 to 0.2 V0 to 0.2 V0 to 0.2 V0 to 0.2 V
VPA circuit open or ground short0 to 0.2 V1.2 to 2.0 V0 to 0.2 V3.4 to 5.3 V
VPA2 circuit open or ground short0.5 to 1.1 V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
E2 circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
MONITOR DESCRIPTION
When VPA or VPA2, deviates from the standard, or the difference between the voltage outputs of the two
sensors is less than threshold, the ECM concludes that there is a defect in the accelerator pedal position
sensor. The ECM turns on the MIL and a DTC is set.
Example:
When the voltage output of the VPA below 0.2 V or exceeds 4.8 V.
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.

Page 1370 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - DIAGNOSTICSENGINE
DI-321
514 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
P2120Accelerator position sensor 1 (VPA) range check
(Fluttering)
P2122Accelerator position sensor 1 (VPA)

Page 1371 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-322
- DIAGNOSTICSENGINE
515 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P2120:
VPA voltage0.2 V or less or 4.8 V or more fluttering
P212

Page 1372 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19759
A14
Accelerator Pedal Position Sensor
VPA1
EP1
VCP1BR-W
R-BECM
E9
2923
VPA2
EP2
VCP25
3
6
2
1
4R
L-R
W-R
WE9
E9
E9
E9
E926
27 22
28
VCP2 EPA2 VPA2 VCPAEPAVPA
- DIAGNOSTICSENGINE
DI-323
516 Auth

Page 1373 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual FI7052DepressedReleased
DI-324
- DIAGNOSTICSENGINE
517 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan too

Page 1374 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
- DIAGNOSTICSENGINE
DI-325
518 Author: Date:
2004 LAND CRU

Page 1375 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19521A19757
EPA (-)
VCPA (+)
EPA2 (-) VCP2 (+)
Accelerator Pedal
Position Sensor
Connector
E9
A14
DI-326
- DIAGNOSTICSENGINE
519 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check voltage betwee

Page 1376 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - DIAGNOSTICSENGINE
DI-327
520 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check if DTC output recur?
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Disconnect the battery termin

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