2005 TOYOTA AVENSIS sensor

05±684
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP2226BAROMETRIC PRESSURE CIRCUIT
DTCP2228BAROMETRIC PRESSURE CIRCUIT LOW INPUT
DTCP2229BAROMETRIC PRESSURE CIRCUIT HIGH INPUT
CIRCUIT DESCRIPTION
Detect the atmospheric pressure using the atmospheric pressure sensor. Followed by the atmospheric pres-
sure, correct the injection timing, the injection volume and the amount of co\
mmon rail internal fuel pressure
and then they create optimum combustion.
DTC No.DTC Detection ConditionTrouble Area
P2226
P2228
P2229
ECM malfunction (1 trip detection logic)
ECM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using \b
 . Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, it is useful for determi\
ning whether the vehicle was running
or stopped, the engine was warmed up or not, etc. at the time of the malfu\
nction.
REPLACE ECM (See page 10±65)
05CQ5±01

05±674
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P2120 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºDº CIRCUIT
DTC P2122 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºDº CIRCUIT LOW INPUT
DTC P2123 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºDº CIRCUIT HIGH INPUT
DTC P2125 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºEº CIRCUIT
DTC P2127 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºEº CIRCUIT LOW INPUT
DTC P2128 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºEº CIRCUIT HIGH INPUT
DTC P2138 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºDº/ºEº VOLTAGE
CORRELATION
HINT:
This is procedure of accelerator pedal position sensor.
05CQ3±01

A71015
0
Accelerator Pedal Opening Angle (deg)125
VPA1 VPA2
5
Movable Range
Usable Range
Usable Range *1
*1
Movable Range
Usable Range
*2
Accelerator pedal released (15
)
Accelerator pedal depressed
(about 100
)
Accelerator Pedal
Position Sensor
Output Voltage (V)
VPA2VPA1 EP2
VCP2
*1:
*
2:
EP1
0.8
105
VCP1*2
*2*1
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±675
AVENSIS REPAIR MANUAL (RM1018E)
CIRCUIT DESCRIPTION
HINT:
This electrical throttle system does not use a throttle cable.
The accelerator pedal position sensor is mounted on the accelerator pedal bracket and it has the 2 sensors
to detect the accelerator position and a malfunction of the accelerator position sensor.
In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA1 and VPA2 of the ECM
changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal. The VPA1 is a
signal to indicate the actual accelerator pedal opening angle which is used for the engine control, and the
VPA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunc-
tion.
The ECM judges the current accelerator pedal opening angle with the signals from terminals VPA1 and
VPA2, and the ECM controls the throttle motor based on these signals.

05±676
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)DTC No.
DTC Detecting ConditionTrouble Area
P2120
Condition (a) continues for 0.5 sec. or more:
(a) VPA less than 0.2 V and VPA2 greater than 0.97 deg, or
VPA greater than 4.8 V
P2122
Conditions (a) and (b) continue for 0.5 sec. or more:
(a) VPA less than 0.2 V
(b) VPA2 greater than 0.97 deg
P2123Condition (a) continues for 2.0 sec. or more:
(a) VPA greater than 4.8 V
P2125
Condition (a) continues for 0.5 sec. or more:
(a) VPA2 less than 0.5 V and VPA greater than 0.97 deg, or
VPA2 greater than 4.8 V and VPA greater than 0.2 V but les
than 3.45 V

Open or short in accelerator pedal position sensor circuit

Accelerator pedal position sensor

ECM
P2127
Conditions (a) and (b) continue for 0.5 sec. or more:
(a) VPA2 less than 0.5 V
(b) VPA greater than 0.97 deg
P2128
Conditions (a) and (b) continue for 2.0 sec. or more:
(a) VPA2 greater than 4.8 V
(b) VPA greater than 0.2 V but less than 3.45 V
P2138
Condition (a) or (b) continues for 2.0 sec. or more:
(a) Difference between VPA and VPA2 less than 0.02 V
(b) VPA less than 0.2 V and VPA2 less than 0.5 V
HINT:
After confirming ºDTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138º, use the hand±held tester
to confirm the accelerator pedal position sensor output voltage.
Accelerator pedal position expressed as voltage output
Trouble areaAccelerator pedal releasedAccelerator pedal depressed
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
VC circuit open0 V0 V0 V0 V
VPA circuit open or ground short0 V1.5 to 2.9 V0 V3.5 to 5.5 V
VPA2 circuit open or ground short0.5 to 1.1 V0 V2.5 to 4.6 V0 V
EP circuit open5 V5 V5 V5 V

A76878
A20
Accelerator Pedal
Position Sensor
VCP16 (LHD)
E926ECM
VCPA B
4 (RHD)
(LHD)B
(LHD) 5
IG2
B
(RHD)
VPA15 (LHD)
E922
VPA G
5 (RHD)
(LHD)G
(LHD) 6
IG2
G
(RHD)
EP13 (LHD)
E928
EPA Y
1 (RHD)
(LHD)Y
(LHD) 1
IG2
Y
(RHD)
VCP24 (LHD)
E927
VCP2 B
6 (RHD)
(LHD)B
(LHD) 7
IG2
B
(RHD)
VPA22 (LHD)
E923
VPA2 W
2 (RHD)
(LHD)W
(LHD) 2
IG2
W
(RHD)
EP21 (LHD)
E929
EPA2 Y
3 (RHD)
(LHD)Y
(LHD) 3
IG2
Y
(RHD)
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±677
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand±held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running
or stopped, the engine was warmed up or not, etc. at the time of the malfunction.

FI7052DepressedReleased
A82236
VCP1VCP2
EP2
EP1
LHD Accelerator Pedal Assy
321
6 54
RHD
Accelerator Pedal Assy
321
65 4
VCP2EP2
EP1
VCP1
05±678
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
1READ VALUE OF HAND±HELD TESTER(ACCEL POS #1 AND ACCEL POS #2)
(a)Connect the hand±held tester to the DLC3.
(b)Turn the ignition switch ON.
(c)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2º and read
its value displayed on the hand±held tester.
Standard:
Accelerator pedalACCEL POS #1ACCEL POS #2
Released0.5 to 1.1 V1.5 to 2.9 V
Depressed2.5 to 4.6 V3.5 to 5.5 V
OKREPLACE ECM (See page 10±65)
NG
2INSPECT ACCELERATOR PEDAL ASSY(ACCELERATOR PEDAL POSITION SENSOR)
(a)Disconnect the accelerator pedal position sensor con-
nector.
(b)Measure the resistance between each terminal.
Standard (LHD):
Symbols (Terminal No.)Resistance
EP1 (3) ± VCP1 (6)225to475k
at20
C(68
F)EP2 (1) ± VCP2 (4)2.25 to 4.75 k
at 20
C (68
F)
Standard (RHD):
Symbols (Terminal No.)Resistance
EP1 (1) ± VCP1 (4)225to475k
at20
C(68
F)EP2 (3) ± VCP2 (6)2.25 to 4.75 k
at 20
C (68
F)
NGREPLACE ACCELERATOR PEDAL ASSY
(See page 10±66)
OK

A54384
EP2EP1VPA2
VCP2 VPA1VCP1
Wire Harness Side
LHD
A20 Accelerator Pedal Position
Sensor Connector
A54384
EP1EP2VPA2
VCP1 VPA1VCP2
Wire Harness Side
RHD
A20 Accelerator Pedal Position
Sensor Connector
A81091
E9
ECM Connector VPA
EPA VCPA
VPA2
EPA2 VCP2
05±680
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK HARNESS AND CONNECTOR(ACCELERATOR PEDAL POSITION SENSOR ± ECM)
(a)Disconnect the A20 accelerator pedal position sensor
connector.
(b)Disconnect E9 the ECM connector.
(c)Check for continuity between the wire harness side con- nectors.
Standard (LHD):
(Check for open)
Symbols (Terminal No.)Specified condition
VPA1 (A20±5) ± VPA (E9±22)
EP1 (A20±3) ± EPA (E9±28)
VCP1 (A20±6) ± VCPA (E9±26)ContinuityVPA2 (A20±2) ± VPA2 (E9±23)Continuity
EP2 (A20±1) ± EPA2 (E9±29)
VCP2 (A20±4) ± VCP2 (E9±27)
(Check for Short)
Symbols (Terminal No.)Specified condition
VPA1 (A20±5) or VPA (E9±22) ± Body ground
EP1 (A20±3) or EPA (E9±28) ± Body ground
VCP1 (A20±6) or VCPA (E9±26) ± Body groundNocontinuityVPA2 (A20±2) or VPA2 (E9±23) ± Body groundNo continuity
EP2 (A20±1) or EPA2 (E9±29) ± Body ground
VCP2 (A20±4) or VCP2 (E9±27) ± Body ground
Standard (RHD):
(Check for open)
Symbols (Terminal No.)Specified condition
VPA1 (A20±5) ± VPA (E9±22)
EP1 (A20±1) ± EPA (E9±28)
VCP1 (A20±4) ± VCPA (E9±26)ContinuityVPA2 (A20±2) ± VPA2 (E9±23)Continuity
EP2 (A20±3) ± EPA2 (E9±29)
VCP2 (A20±6) ± VCP2 (E9±27)
(Check for Short)
Symbols (Terminal No.)Specified condition
VPA1 (A20±5) or VPA (E9±22) ± Body ground
EP1 (A20±1) or EPA (E9±28) ± Body ground
VCP1 (A20±4) or VCPA (E9±26) ± Body groundNocontinuityVPA2 (A20±2) or VPA2 (E9±23) ± Body groundNo continuity
EP2 (A20±3) or EPA2 (E9±29) ± Body ground
VCP2 (A20±6) or VCP2 (E9±27) ± Body ground
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM (See page 10±65)

A81500
P1271 Malfunction Detection
ECMCommand Signal (PRD)
EDU
Confirmation Signal (IJF)
Pressure Discharge Valve
Command Signal
Pressure Discharge Valve
Confirmation SignalPRD
IJFON
OFF
Normal
Abnormal
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±665
AVENSIS REPAIR MANUAL (RM1018E)
MONITOR DESCRIPTION
P1271 (Open or short in pressure discharge valve circuit):
This DTC will be set if there is no valve opening confirmation signal (IJF) from the EDU to the ECM, despite
the ECM commanding the pressure discharge valve to open with the EDU. This DTC refers to open or short
malfunction of the pressure discharge valve circuit, therefore the malfunction that the valve is stuck open
or closed can be excluded.
The EDU monitors the current supplied to the pressure discharge valve, and the EDU interprets the IJF sig-
nal is low if the current exceeds the specified level, and the EDU indicates that there is the current in the
pressure discharge valve.
If this DTC is present, the ECM enters fail±safe mode and limits the engine power. The fail±safe mode will
continue until the ignition switch is turned OFF.
P1272 (Closed malfunction of the pressure discharge valve):
The pressure discharge valve will open and discharge the internal fuel pressure of the common rail to the
fuel tank when the ignition switch is turned OFF. In this event, the ECM compares the actual dropping rate
of the internal fuel pressure and the simulated dropping rate. If the ECM judges the actual dropping rate is
smaller than the simulation, the ECM then interprets this as the valve has stuck closed and set this DTC.
This DTC detection will be activated if the internal fuel pressure does not drop below the specified level after
the ignition switch has been turned OFF.
If this DTC is present, the ECM enters fail±safe mode and limits the engine power. The fail±safe mode will
continue until the ignition switch is turned OFF.
MONITOR STRATEGY
P1271:
Required sensorsEDU
Frequency of operationContinuous
Duration3 sec.
CHK ENG operation1 driving cycles