1998 TOYOTA LAND CRUISER sensor
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- 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
FI7052DepressedReleased
DI-332
- DIAGNOSTICSENGINE
525 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Either of the following conditions is metA or B
A. Ignition switchON
B. Throttle control motor powerON
System is not under limp home mode due to accelerator pedal position sensor malfunction
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
|VPA - (VPA2 - 0.8)|*
*Corrected by learning valueMore than 0.4 V
WIRING DIAGRAM
Refer to DTC P2120 on page DI-318.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, as well as other data from the time when a malfunction occurred.
Hand-held tester:
1 Connect hand-held tester, and read the voltage for accelerator pedal position
sensor data.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tes-
ter main switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL
POS #2.
CHECK:
Read the voltage for the accelerator pedal position sensor data.
OK:
Accelerator pedalACCEL POS #1ACCEL POS #2
Released0.5 to 1.1 V1.2 to 2.0 V
Depressed2.6 to 4.5 V3.4 to 5.3 V
OK Replace ECM (See page SF-60).
NG
Page 1382 of 3115
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 CRUISER (RM1071U)
2 Check for open and short in harness and connector between accelerator pedal
position sensor and ECM.
PREPARATION:
(a) Disconnect the A14 accelerator pedal position sensor
connector.
(b) Disconnect the E9 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard (Check for open):
Tester ConnectionSpecified Condition
VPA1 (A14-5) - VPA (E9-22)Below 1 W
EP1 (A14-3) - EPA (E9-28)Below 1 W
VCP1 (A14-6) - VCPA (E9-26)Below 1 W
VPA2 (A14-2) - VPA2 (E9-23)Below 1 W
EP2 (A14-1) - EPA2 (E9-29)Below 1 W
VCP2 (A14-4) - VCP2 (E9-27)Below 1 W
Standard (Check for short):
Tester ConnectionSpecified Condition
VPA1 (A14-5) or VPA (E9-22) -
Body ground10 kW or higher
EP1 (A14-3) or EPA (E9-28) -
Body ground10 kW or higher
VCP1 (A14-6) or VCPA (E9-26) -
Body ground10 kW or higher
VPA2 (A14-2) or VPA2 (E9-23) -
Body ground10 kW or higher
EP2 (A14-1) or EPA2 (E9-29) -
Body ground10 kW or higher
VCP2 (A14-4) or VCP2 (E9-27) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace accelerator pedal pedal assembly.
Page 1384 of 3115
A19521A19757
EPA (-)
VCPA (+)
EPA2 (-) VCP2 (+)
Accelerator Pedal
Position Sensor
Connector
E9
A14
- DIAGNOSTICSENGINE
DI-335
528 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open and short in harness and connector between accelerator pedal
position sensor and ECM.
PREPARATION:
(a) Turn the ignition switch ON.
(b) Disconnect the A14 accelerator pedal position sensor
connector.
CHECK:
Measure the voltage between the specified terminals of the E9
ECM connector.
OK:
Tester ConnectionSpecified Condition
VCPA (E9-26) - EPA (E9-28)4.5 to 5.5 V
VCP2 (E9-27) - EPA2 (E9-29)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
Replace accelerator pedal assembly.
Page 1395 of 3115
DI1L4-19
DI-36
- DIAGNOSTICSENGINE
229 Author: Date:
2004 LAND CRUISER (RM1071U)
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
P0031
(DI-49)Oxygen Sensor Heater Control
Circuit Low (Bank 1 Sensor 1)
Open in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
ECM
P0032
(DI-49)Oxygen Sensor Heater Control
Circuit High (Bank 1 Sensor 1)
Short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
ECM
P0037
(DI-49)Oxygen Sensor Heater Control
Circuit Low (Bank 1 Sensor 2)
Open in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
ECM
P0038
(DI-49)Oxygen Sensor Heater Control
Circuit High (Bank 1 Sensor 2)
Short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
ECM
P0051
(DI-49)Oxygen Sensor Heater Control
Circuit Low (Bank 2 Sensor 1)
Open in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
ECM
P0052
(DI-49)Oxygen Sensor Heater Control
Circuit High (Bank 2 Sensor 1)
Short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
ECM
P0057
(DI-49)Oxygen Sensor Heater Control
Circuit Low (Bank 2 Sensor 2)
Open in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
ECM
P0058
(DI-49)Oxygen Sensor Heater Control
Circuit High (Bank 2 Sensor 2)
Short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
ECM
P0100
(DI-57)Mass or Volume Air Flow Circuit
Open or short in mass air flow meter circuit
Mass air flow meter
ECM
P0101
(DI-65)Mass or Volume Air Flow Circuit
Range/Performance ProblemMass air flow meter
P0102
(DI-57)Mass or Volume Air Flow Circuit
Low InputOpen or short in mass air flow meter circuit
Mass air flow meter
ECM
P0103
(DI-57)Mass or Volume Air Flow Circuit
High InputOpen or short in mass air flow meter circuit (+B circuit)
Mass air flow meter
ECM
Page 1396 of 3115
- DIAGNOSTICSENGINE
DI-37
230 Author: Date:
2004 LAND CRUISER (RM1071U)P0110
(DI-68)
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-68)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-68)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-75)Engine Coolant Temperature Cir-
cuitOpen or short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM
P0116
(DI-82)Engine Coolant Temperature Cir-
cuit Range/Performance Prob-
lem
Engine coolant temperature sensor
P0117
(DI-75)Engine Coolant Temperature Cir-
cuit Low InputOpen or short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM
P0118
(DI-75)Engine Coolant Temperature Cir-
cuit High InputOpen or short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM
P0120
(DI-84)Throttle Pedal Position Sensor/
Switch ºAº CircuitThrottle control motor and sensor
ECM
P0121
(DI-97)Throttle/Pedal Position Sensor/
Switch ºAº Circuit Range/Perfor-
mance Problem
Throttle control motor and sensor
P0122
(DI-84)Throttle/Pedal Position Sensor/
Switch ºAº Circuit Low Input
Throttle control motor and sensor
Short in VTA1 circuit
Open in VC circuit
ECM
P0123
(DI-84)Throttle/Pedal Position Sensor/
Switch ºAº Circuit High Input
Throttle control motor and sensor
Open in VTA1 circuit
Open in E2 circuit
VC and VTA1 circuit are short-circuited
ECM
P0125
(DI-99)Insufficient Coolant Temperature
for Closed Loop Fuel ControlCooling system
Engine coolant temperature sensor
Thermostat
P0128
(DI-102)Coolant Thermostat (Coolant
Temperature Below Thermostat
Regulating Temperature)Thermostat
Cooling system
Engine coolant temperature sensor
ECM
P0130
(DI-106)Oxygen Sensor Circuit
(Bank 1 Sensor 1)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Air induction system
Fuel pressure
Injector
ECM
Page 1397 of 3115
DI-38
- DIAGNOSTICSENGINE
231 Author: Date:
2004 LAND CRUISER (RM1071U)P0133
(DI-1 17)
Oxygen Sensor Circuit Slow Re-
sponse (Bank 1 Sensor 1)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Air induction system
Fuel pressure
Injector
ECM
P0134
(DI-129)Oxygen Sensor Circuit No Activ-
ity Detected (Bank 1 Sensor 1)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Air induction system
Fuel pressure
PCV hose connection
PCV valve and hose
Injector
Gas leakage on exhaust system
PCV piping
ECM
P0136
(DI-138)Oxygen Sensor Circuit Malfunc-
tion (Bank 1 Sensor 2)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
P0150
(DI-106)Oxygen Sensor Circuit
(Bank 2 Sensor 1)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Air induction system
Fuel pressure
Injector
ECM
P0153
(DI-1 17)Oxygen Sensor Circuit Slow Re-
sponse (Bank 2 Sensor 1)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Air induction system
Fuel pressure
Injector
ECM
P0154
(DI-129)Oxygen Sensor Circuit No Activ-
ity Detected (Bank 2 Sensor 1)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Air induction system
Fuel pressure
PCV hose connection
PCV valve and hose
Injector
Gas leakage on exhaust system
PCV piping
ECM
P0156
(DI-138)Oxygen Sensor Circuit Malfunc-
tion (Bank 2 Sensor 2)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Page 1398 of 3115
- DIAGNOSTICSENGINE
DI-39
232 Author: Date:
2004 LAND CRUISER (RM1071U)P0171
(DI-147)
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 or ECD relay
PCV piping
ECM
P0172
(DI-147)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-147)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 or ECD relay
PCV piping
ECM
P0175
(DI-147)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-84)Throttle/Pedal Position Sensor/
Switch ºBº CircuitThrottle control motor and sensor
ECM
P0222
(DI-84)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-84)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