TOYOTA AVENSIS 2005 Service Repair Manual

05−488
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ECM (See page 10− 29)

05−482
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
DTC P2226 BAROMETRIC PRESSURE CIRCUIT
DTC P2228 BAROMETRIC PRESSURE CIRCUIT LOW
INPUT
DTC P2229 BAROMETRIC PRESSURE CIRCUIT HIGH INPUT
CIRCUIT DESCRIPTION
To detect atmospheric pressure, the atmospheric pressure sensor built in the ECM is used in the common
rail system. Following the changes in the atmospheric pressure, the ECM corrects the fuel injection volume,
timing and duration, and adjusts the common rail internal fuel pressure for optimizing combustion.
DTC No.DTC Detection ConditionTrouble Area
P2226
P2228
P2229Atmospheric pressure sensor malfunction
(1 trip detection logic)S ECM
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, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air −fuel ratio was lean or rich, and other data
from the time the malfunction occurred.
REPLACE ECM (See page 10− 29)
05CQ5 −03

−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −479
AVENSIS Supplement (RM 1045E)
DTC P2 121 THROTTLE/PEDAL POSITION SENSOR/
SWITCH ”D” CIRCUIT RANGE/
PERFORMANCE
CIRCUIT DESCRIPTION
Refer to DTC P2 120 on page 05 −473.
DTC No.DTC Detection ConditionTrouble Area
P2 121
Conditions (a) and (b) continue for 0.5 second:
(a) Difference between VPA and VPA2 exceeds the threshold
(b) IDL is OFFS Accelerator pedal position sensor circuit
S Accelerator pedal position sensor
S ECM
HINT:
After confirming DTC P2 121, check the accelerator pedal position sensor output voltage using the hand −
held tester. Reference:
Accelerator Pedal Position (Voltage Output)
Trouble AreaAccelerator Pedal ReleasedAccelerator Pedal DepressedTrouble Area
ACCEL POS # 1ACCEL POS #2ACCEL POS #1ACCEL POS #2
Normal condition0.5 to1.1 V1.2 to 2.0 V2.6 to 4.5 V3.4 to 5.3 V
VCP 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
EP circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
WIRING DIAGRAM
Refer to DTC P2 120 on page 05 −473.
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, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air −fuel ratio was lean or rich, and other data
from the time the malfunction occurred.
05I7T −01

A84814
VCP2 EP2
EP1
VCP 1
A20
Component Side (RHD):
1
2
5
64 3
Accelerator Pedal Position Sensor
A848 14
VCP 1
EP
1
EP2
VCP2
A20
1
2
5
64
3
Accelerator Pedal Position Sensor
Component Side (LHD):
A66060
VPA2 (+)
VPA (+)
EPA ( −)
EPA2 ( −)
ECM Connector
E9
05 −480
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
1 INSPECT ACCELERATOR PEDAL ASSY(ACCELERATOR PEDAL POSITION
SENSOR)
(a) Disconnect the A20 accelerator pedal position sensor
connector.
(b) Measure the resistance between each terminal.
Standard (RHD):
Tester ConnectionSpecified Condition
EP1 (1 ) − VCP 1 (4)225t 475k
t 20_ C (68_ F)EP2 (3) − VCP2 (6)2.25 to 4.75 k
at 20 _ C (68 _ F)
Standard (LHD):
Tester ConnectionSpecified Condition
EP 1 (3) − VCP 1 (6)225t 475k
t 20_ C (68_ F)EP2 ( 1) − VCP2 (4)2.25 to 4.75 k
at 20 _ C (68 _ F)
(c) Reconnect the accelerator pedal position sensor connec-
tor.
NG REPLACE ACCELERATOR PEDAL ASSY (See page 10− 66 of Pub. No. 101 8E AVENSIS
REPAIR MANUAL)
OK
2 INSPECT ECM(VPA AND VPA2 VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the specified terminals of the E9 ECM connector.
Accelerator Pedal PositionTester ConnectionSpecified Condition
ReleasedVPA (E9−22)0.5 to 1.1 V
Depressed
VPA (E9 22)
− EPA (E9 −28)2.6 to 4.5 V
ReleasedVPA2 (E9 −23)1.2 to 2.0 V
Depressed
VPA2(E9 23)
−EPA2 (E9 −29)3.4 to 5.3 V
OK REPLACE ECM (See page 10− 29)
NG

A84847
EP1EP2VPA2
VCP1
VPA1VCP2 A20
Wire Harness Side (RHD):
Front View Accelerator Pedal Position Sensor
Connector
A84847
EP1
EP2VPA2
VCP1
VPA1 VCP2 A20 Accelerator Pedal Position Sensor
Connector
Wire Harness Side (LHD):
Front View
A81091
E9
ECM ConnectorVPA
VCPA
VPA2
EPA2
VCP2EPA
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−481
AVENSIS Supplement (RM1045E)
3 CHECK HARNESS AND CONNECTOR(ACCELERATOR PEDAL POSITION
SENSOR−ECM)
(a) Disconnect the A20 accelerator pedal position sensor
connector.
(b) Disconnect the E9 ECM connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open) (RHD):
Tester ConnectionSpecified Condition
VPA1(A20−5)−VPA (E9−22)
EP1(A20−1)−EPA (E9−28)
VCP1(A20−4)−VCPA (E9−26)Below1
VPA2 (A20−2)−VPA2 (E9−23)Below1

EP2 (A20−3)−EPA2 (E9−29)
VCP2 (A20−6)−VCP2 (E9−27)
Standard (Check for open) (LHD):
Tester ConnectionSpecified Condition
VPA1(A20−5)−VPA (E9−22)
EP1(A20−3)−EPA (E9−28)
VCP1(A20−6)−VCPA (E9−26)Below1
VPA2 (A20−2)−VPA2 (E9−23)Below1

EP2 (A20−1)−EPA2 (E9−29)
VCP2 (A20−4)−VCP2 (E9−27)
Standard (Check for short) (RHD):
Tester ConnectionSpecified 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 ground10k
orhigherVPA2 (A20−2) or VPA2 (E9−23)−Body ground10k
or higher
EP2 (A20−3) or EPA2 (E9−29)−Body ground
VCP2 (A20−6) or VCP2 (E9−27)−Body ground
Standard (Check for short) (LHD):
Tester ConnectionSpecified 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 ground10k
orhigherVPA2 (A20−2) or VPA2 (E9−23)−Body ground10k
or higher
EP2 (A20−1) or EPA2 (E9−29)−Body ground
VCP2 (A20−4) or VCP2 (E9−27)−Body ground
(d) Reconnect the accelerator pedal position sensor connec-
tor.
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ACCELERATOR PEDAL ASSY
(See page10−66 of Pub. No. RM1018E AVENSIS REPAIR MANUAL)

− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−473
AVENSIS Supplement (RM1045E)
DTC P2120 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”D” CIRCUIT
DTC P2122 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”D” CIRCUIT LOW INPUT
DTC P2123 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”D” CIRCUIT HIGH INPUT
DTC P2125 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”E” CIRCUIT
DTC P2127 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”E” CIRCUIT LOW INPUT
DTC P2128 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”E” CIRCUIT HIGH INPUT
DTC P2138 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”D”/”E” VOLTAGE
CORRELATION
HINT:
This is the procedure of troubleshooting the accelerator pedal position sensor.
05I7S−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
(about100˚)
Accelerator Pedal
Position Sensor
Output Voltage (V)
VPA2VPA1 EP2
VCP2
*1:
*
2:
EP1
0.8
105
VCP1*2
*2*1
05−474
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
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 malfunction of the accelerator position sensor itself.
In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA1and VPA2 of the ECM
changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal. The VPA1is 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 malfunction.
The ECM judges the current accelerator pedal opening angle with the signals from pedal terminals VPA1
and VPA2, and the ECM controls the throttle motor based on these signals.
DTC No.DTC Detection ConditionTrouble Area
P2120
Condition (a) continues for 0.5 second or more:
VPA is less than 0.2 V for when accelerator pedal is fully re-
leased, or VPA is more than 4.8 V
P2122VPA is less than 0.2 V for 0.5 second or more when accelera-
tor pedal is fully released
P2123VPA is more than 4.8 V for 2.0 seconds or more
P2125
Condition (a) continues for 0.5 second or more:
(a) VPA2 less than 0.5 V when accelerator pedal is fully re-
leased, or VPA2 is more than 4.8 V when VPA is between
0.2 V and 3.45 V
SOpen or short in accelerator pedal position sensor circuit
SAccelerator pedal position sensor
SECM
P2127VPA2 less than 0.5 V for 0.5 second or more when accelerator
pedal is fully released
P2128VPA2 is more than 4.8 V for 2.0 seconds or more when VPA
between 0.2 V and 3.45 V
P2138
Condition (a) or (b) continues for 2.0 seconds or more:
(a) Difference between VPA and VPA2 is less than 0.02 V
(b) VPA is less than 0.2 V and VPA2 is less than 0.5 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)(From September, 2003)
05−475
AVENSIS Supplement (RM1045E)
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138, check the accelerator pedal
position sensor output voltage using the hand−held tester.
Reference:
Accelerator Pedal Position (Voltage Output)
Trouble AreaAccelerator Pedal ReleasedAccelerator Pedal DepressedTroubleArea
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
Normal condition0.5 to1.1V1.2 to 2.0 V2.6 to 4.5 V3.4 to 5.3 V
VCP 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 to1.1V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
EP circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data usingthe hand−held tester.Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air−fuel ratio was lean or rich, and other data
from the time the malfunction occurred.

FI7052Depressed Released
A848
14
VCP2 EP2
EP1
VCP 1
A20
Component Side (RHD):
1
2
5
64 3
Accelerator Pedal Position Sensor
A848 14
VCP 1
EP
1
EP2
VCP2
A20
1
2
5
64
3
Accelerator Pedal Position Sensor
Component Side (LHD):
05
−476
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
1 READ 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 to ON.
(c) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ETCS / ACCEL POS # 1 and ACCEL POS #2” and read
its value displayed on the hand −held tester.
Standard:
Accelerator PedalACCEL POS # 1ACCEL POS #2
Released0.5 to1.1 V1.2 to 2.0 V
Depressed2.6 to 4.5 V3.4 to 5.3 V
OK REPLACE ECM (See page 10− 29)
NG
2 INSPECT ACCELERATOR PEDAL ASSY(ACCELERATOR PEDAL POSITION SENSOR)
(a) Disconnect the A20 accelerator pedal position sensor
connector.
(b) Measure the resistance between each terminal. Standard (RHD):
Tester ConnectionSpecified Condition
EP1(1 ) − VCP 1(4)225t475k
t20_C(68_F)EP2 (3) −VCP2 (6)2.25 to 4.75 k
at 20 _C (68 _F)
Standard (LHD):
Tester ConnectionSpecified Condition
EP 1(3) −VCP 1(6)225t475k
t20_C(68_F)EP2 ( 1) − VCP2 (4)2.25 to 4.75 k
at 20 _C (68 _F)
(c) Reconnect the accelerator pedal position sensor connec-
tor.
NG REPLACE ACCELERATOR PEDAL ASSY (See page 10− 66 of Pub. No. RM 10 18E AVENSIS
REPAIR MANUAL)
OK

A66060ECM ConnectorEPA (
−) VCPA (+)
E9
EPA2 ( −)
VCP2 (+)
A66060ECM Connector EPA (
−) E9
EPA2 (
−)
VCP2 (+)VCPA (+)
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −477
AVENSIS Supplement (RM 1045E)
3 INSPECT ECM(VCPA AND VCP2 VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the specified terminals of
the E9 ECM connector.
Standard:
Tester ConnectionSpecified Condition
VCPA (E9 −26) − EPA (E9 −28)45 t 55 VVCP2 (E9 −27) − EPA2 (E9 −29)4.5 to 5.5 V
NG REPLACE ECM (See page 10− 29)
OK
4 INSPECT ECM(VPA AND VPA2 VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the specified terminals of the E9 ECM connector.
Standard:
Accelerator Pedal PositionTester ConnectionSpecified Condition
ReleasedVPA (E9−22)0.5 to 1.1 V
Depressed
VPA (E9 22)
− EPA (E9 −28)2.6 to 4.5 V
ReleasedVPA2 (E9 −23)1.2 to 2.0 V
Depressed
VPA2 (E9 23)
− EPA2 (E9 −29)3.4 to 5.3 V
OK REPLACE ECM (See page 10− 29)
NG