TOYOTA AVENSIS 2005 Service Repair Manual

05–192
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P2121 THROTTLE/PEDAL POSITION SENSOR/SWITCH ”D” CIRCUIT
RANGE/PERFORMANCE
HINT:
This DTC is related to the accelerator pedal position senso r.
CIRCUIT DESCRIPTION
Refer to DTC P2120 on page 05–184.
DTC No.DTC Detection ConditionTrouble Area
P2121
Conditions (a) and (b) continue for 0.5 seconds:
(a) Difference between VPA1 and VPA2 exceeds the threshold
(b) IDL is OFF Accelerator pedal position sensor circuit
 Accelerator pedal position sensor
 ECM
HINT:
When DTC P2121 is detected, check the output voltage of the accelerator peda\
l position sensor by selecting
Powertrain / Engine and ECT / Data List / Accelerator POS No. 1 and Accelerator POS No. 2 on the int\
elligent
tester ll.
Reference:
Accelerator Pedal Position (Voltage Output)
Trouble AreaAccelerator Pedal ReleasedAccelerator Pedal DepressedTrouble AreaAccelerator POS
No. 1Accelerator POS No. 2Accelerator POS No. 1Accelerator POS No. 2
Normal condition0.5 to 1.1 V1.2 to 2.0 V2.6 to 4.5 V3.4 to 5.0 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 5.0 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
EPA circuit open4.5 to 5.0 V4.5 to 5.0 V4.5 to 5.0 V4.5 to 5.0 V
WIRING DIAGRAM
Refer to DTC P2120 on page 05–184.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester II. Freeze frame data record the engine condition\
when
malfunctions are detected. When troubleshooting, freeze frame data can h\
elp determine if the vehicle was
moving or stationary, 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.
05B5S–05

A84814
VCP2EP2
EP1
VCP1
Component Side (RHD):
12
5
64
3
Accelerator Pedal Position Sensor
A84814
VCP1 EP1
EP2
VCP2
12
5
64
3
Accelerator Pedal Position Sensor
Component Side (LHD):
A66060
VPA2 (+)
VPA (+)
EPA (–)
EPA2 (–)
ECM Connector
E9
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–193
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
1 INSPECT ACCELERATOR PEDAL ASSY(ACCELERATOR PEDAL POSITION
SENSOR)
(a) Disconnect the A20 accelerator pedal position sensor
connector.
(b) Measure the resistance between each pair of terminals. Standard (RHD):
Tester ConnectionSpecified Condition
EP1 (1) – VCP1 (4)2.25 to 4.75 k Ω at 20 C (68 F)
EP2 (3) – VCP2 (6)2.25 to 4.75 k Ω at 20 C (68 F)
Standard (LHD):
Tester ConnectionSpecified Condition
EP1 (3) – VCP1 (6)2.25 to 4.75 k Ω at 20 C (68 F)
EP2 (1) – VCP2 (4)2.25 to 4.75 k Ω at 20 C (68 F)
(c) Reconnect the accelerator pedal position sensor connec-
tor.
NG REPLACE ACCELERATOR PEDAL ASSY (See page 10–12 )
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)
– EPA (E9–28)0.5 to 1.1 V
DepressedVPA (E9–22) – EPA (E9–28)2.6 to 4.5 V
ReleasedVPA2 (E9–23) – EPA2 (E9–29)1.2 to 2.0 V
DepressedVPA2 (E9–23) – EPA2 (E9–29)3.4 to 5.0 V
OK REPLACE ECM (See page 10–65 of Pub. No.RM1018E AVENSIS)
NG

A84847
EP1 EP2VPA2
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 Connector VPA
VCPA
VPA2
EPA2 VCP2EPA
05–194
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
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. Standard (RHD) (Check for open):
Tester ConnectionSpecified Condition
VPA1 (A20–5) – VPA (E9–22)Below 1 Ω
EP1 (A20–1) – EPA (E9–28)Below 1 Ω
VCP1 (A20–4) – VCPA (E9–26)Below 1 Ω
VPA2 (A20–2) – VPA2 (E9–23)Below 1 Ω
EP2 (A20–3) – EPA2 (E9–29)Below 1 Ω
VCP2 (A20–6) – VCP2 (E9–27)Below 1 Ω
Standard (LHD) (Check for open):
Tester ConnectionSpecified Condition
VPA1 (A20–5) – VPA (E9–22)Below 1 Ω
EP1 (A20–3) – EPA (E9–28)Below 1 Ω
VCP1 (A20–6) – VCPA (E9–26)Below 1 Ω
VPA2 (A20–2) – VPA2 (E9–23)Below 1 Ω
EP2 (A20–1) – EPA2 (E9–29)Below 1 Ω
VCP2 (A20–4) – VCP2 (E9–27)Below 1 Ω
Standard (RHD) (Check for short):
Tester ConnectionSpecified Condition
VPA1 (A20–5) or VPA (E9–22) – Body ground10 kΩ or higher
EP1 (A20–1) or EPA (E9–28) – Body ground10 k Ω or higher
VCP1 (A20–4) or VCPA (E9–26) – Body ground10 k Ω or higher
VPA2 (A20–2) or VPA2 (E9–23) – Body ground10 k Ω or higher
EP2 (A20–3) or EPA2 (E9–29) – Body ground10 k Ω or higher
VCP2 (A20–6) or VCP2 (E9–27) – Body ground10 k Ω or higher
Standard (LHD) (Check for short):
Tester ConnectionSpecified Condition
VPA1 (A20–5) or VPA (E9–22) – Body ground10 k Ω or higher
EP1 (A20–3) or EPA (E9–28) – Body ground10 k Ω or higher
VCP1 (A20–6) or VCPA (E9–26) – Body ground10 k Ω or higher
VPA2 (A20–2) or VPA2 (E9–23) – Body ground10 k Ω or higher
EP2 (A20–1) or EPA2 (E9–29) – Body ground10 k Ω or higher
VCP2 (A20–4) or VCP2 (E9–27) – Body ground10 k Ω or higher
(d) Reconnect the accelerator pedal position sensor connec-
tor.
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ACCELER ATOR PEDAL ASSY ( See page 10–12)

05–184
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
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:
These DTCs are related to the accelerator pedal position sensor.
05KOD–02

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
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–185
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
CIRCUIT DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket and it has the 2 sensors
to detect the accelerator position and malfunctions of the accelerator position sensor itself.
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 engine control, and the VPA2
is a signal to indicate the information about the opening angle which is used for detecting a malfunction in
the sensor itself.
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.
HINT:
This ETCS (Electronic Throttle Control System) does not use a throttle cable.

05–186
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)DTC No.
DTC Detection ConditionTrouble Area
P2120VPA1 quickly fluctuates up and down beyond upper and lower
malfunction thresholds for 0.5 seconds or moreAccelerator pedal position sensor
ECM
P2122
Condition (a) continues for 0.5 seconds or more when acceler-
ator pedal is fully released:
(a) VPA1 is 0.2 V or lessAccelerator pedal position sensor
Open in VCP1 circuit
Open or ground short in VPA1 circuit
ECM
P2123Condition (a) continues for 2.0 seconds or more:
(a) VPA1 is 4.8 V or moreAccelerator pedal position sensor
Open in EPA circuit
ECM
P2125VPA2 quickly fluctuates up and down beyond upper and lower
malfunction thresholds for 0.5 seconds or moreAccelerator pedal position sensor
ECM
P2127
Condition (a) continues for 0.5 seconds or more when acceler-
ator pedal is fully released:
(a) VPA2 is 0.5 V or lessAccelerator pedal position sensor
Open in VCP2 circuit
Open or ground short in VPA2 circuit
ECM
P2128
Conditions (a) and (b) continue for 2.0 seconds or more:
(a) VPA2 is 4.8 V or more
(b) VPA1 is 0.2 V or more and VPA1 is 3.45 V or lessAccelerator pedal position sensor
Open in EPA2 circuit
ECM
P2138
Condition (a) or (b) continues for 2.0 seconds or more:
(a) Difference between VPA1 and VPA2 is 0.02 V or less
(b) VPA1 is 0.2 V or less and VPA2 is 0.5 V or lessVPA1 and VPA2 circuits are short–circuited
Accelerator pedal position sensor
ECM
HINT:
When DTC P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138 is detected, check the output volt-
age of the accelerator pedal position sensor by selecting Powertrain / Engine and ECT / Data List / Accelera-
tor POS No. 1 and Accelerator POS No. 2 on the intelligent tester ll.
Reference:
Accelerator Pedal Position (Voltage Output)
Trouble AreaAccelerator Pedal ReleasedAccelerator Pedal DepressedTrouble AreaAccelerator POS
No. 1Accelerator POS
No. 2Accelerator POS
No. 1Accelerator POS
No. 2
Normal condition0.5 to 1.1 V1.2 to 2.0 V2.6 to 4.5 V3.4 to 5.0 V
VCP circuit open0 to 0.2 V0 to 0.2 V0 to 0.2 V0 to 0.2 V
Open or ground short in VPA1 circuit0 to 0.2 V1.2 to 2.0 V0 to 0.2 V3.4 to 5.0 V
Open or ground short in VPA2 circuit0.5 to 1.1 V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
EPA circuit open4.5 to 5.0 V4.5 to 5.0 V4.5 to 5.0 V4.5 to 5.0 V
Accelerator pedal position is expressed as voltages.

A96013
A20
Accelerator Pedal
Position Sensor
VPA2
VPA1
EP1 VCP1 VCP2
6
EP2E927ECM
VPA2
VPA
EPA VCPA EPA2 VCP2 4
22
13
64
55
31
(LHD)(RHD)
B (RHD)
W (RHD)
Y (RHD)
B (RHD)
G (RHD)
Y (RHD)G (LHD) W (LHD) W (LHD)
Y (LHD) Y (LHD) B (LHD) B (LHD)
B (LHD)
Y (LHD) Y (LHD) G (LHD) B (LHD)IG2
IG2
IG2
IG2
IG2
IG27
2
3
5
6
1
E928 E922 E926 E929 E923
FI7052DepressedReleased
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–187
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester II. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, 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.
1 READ VALUE OF INTELLIGENT TESTER II(ACCELERATOR POS NO.1 AND
ACCELERATOR POS NO.2)
(a) Connect the intelligent tester ll to the DLC3.
(b) Turn the ignition switch to ON and turn the intelligent tes-
ter ll ON.
(c) Select the following menu items: Powertrain / Engine and
ECT / Data List / Accelerator POS No. 1 and Accelerator
POS No. 2.
(d) Read the value.
Standard:
Accelerator PedalAccelerator POS No. 1Accelerator POS No. 2
Released0.5 to 1.1 V1.2 to 2.0 V
Depressed2.6 to 4.5 V3.4 to 5.0 V

A84814
VCP2EP2
EP1
VCP1
Component Side (RHD):
12
5
64
3
Accelerator Pedal Position Sensor
A84814
VCP1 EP1
EP2
VCP2
12
5
64
3
Accelerator Pedal Position Sensor
Component Side (LHD):
A66060ECM Connector
EPA (–)VCPA (+)
E9
EPA2 (–)
VCP2 (+)
05–188
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
OK Go to step 6
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 pair of terminals. Standard (RHD):
Tester ConnectionSpecified Condition
EP1 (1) – VCP1 (4)2.25 to 4.75 k Ω at 20 C (68 F)
EP2 (3) – VCP2 (6)2.25 to 4.75 k Ω at 20 C (68 F)
Standard (LHD):
Tester ConnectionSpecified Condition
EP1 (3) – VCP1 (6)2.25 to 4.75 k Ω at 20 C (68 F)
EP2 (1) – VCP2 (4)2.25 to 4.75 k Ω at 20 C (68 F)
(c) Reconnect the accelerator pedal position sensor connec-
tor.
NG REPLACE ACCELERATOR PEDAL ASSY (See page 10–12 )
OK
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)4.5 to 5.0 V
VCP2 (E9–27) – EPA2 (E9–29)4.5 to 5.0 V
NG REPLACE ECM (See page 10–65 of Pub. No. RM1018E AVENSIS)
OK

A66060ECM ConnectorEPA (–)E9
EPA2 (–)
VPA2 (+)VPA (+)
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–189
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
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)
– EPA (E9–28)0.5 to 1.1 V
DepressedVPA (E9–22)
– EPA (E9–28)2.6 to 4.5 V
ReleasedVPA2 (E9–23)
– EPA2 (E9–29)1.2 to 2.0 V
DepressedVPA2 (E9–23)
– EPA2 (E9–29)3.4 to 5.0 V
OK REPLACE ECM (See page 10–65 of Pub. No.
RM1018E AVENSIS)
NG

A84847
EP1 EP2VPA2
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
05–190
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
5 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.
Standard (RHD) (Check for open):
Tester ConnectionSpecified Condition
VPA1 (A20–5) – VPA (E9–22)Below 1 Ω
EP1 (A20–1) – EPA (E9–28)Below 1 Ω
VCP1 (A20–4) – VCPA (E9–26)Below 1 Ω
VPA2 (A20–2) – VPA2 (E9–23)Below 1 Ω
EP2 (A20–3) – EPA2 (E9–29)Below 1 Ω
VCP2 (A20–6) – VCP2 (E9–27)Below 1 Ω
Standard (LHD) (Check for open):
Tester ConnectionSpecified Condition
VPA1 (A20–5) – VPA (E9–22)Below 1 Ω
EP1 (A20–3) – EPA (E9–28)Below 1 Ω
VCP1 (A20–6) – VCPA (E9–26)Below 1 Ω
VPA2 (A20–2) – VPA2 (E9–23)Below 1 Ω
EP2 (A20–1) – EPA2 (E9–29)Below 1 Ω
VCP2 (A20–4) – VCP2 (E9–27)Below 1 Ω
Standard (RHD) (Check for short):
Tester ConnectionSpecified Condition
VPA1 (A20–5) or VPA (E9–22) – Body ground10 kΩ or higher
EP1 (A20–1) or EPA (E9–28) – Body ground10 kΩ or higher
VCP1 (A20–4) or VCPA (E9–26) – Body ground10 kΩ or higher
VPA2 (A20–2) or VPA2 (E9–23) – Body ground10 kΩ or higher
EP2 (A20–3) or EPA2 (E9–29) – Body ground10 kΩ or higher
VCP2 (A20–6) or VCP2 (E9–27) – Body ground10 kΩ or higher
Standard (LHD) (Check for short):
Tester ConnectionSpecified Condition
VPA1 (A20–5) or VPA (E9–22) – Body ground10 kΩ or higher
EP1 (A20–3) or EPA (E9–28) – Body ground10 kΩ or higher
VCP1 (A20–6) or VCPA (E9–26) – Body ground10 kΩ or higher
VPA2 (A20–2) or VPA2 (E9–23) – Body ground10 kΩ or higher
EP2 (A20–1) or EPA2 (E9–29) – Body ground10 kΩ or higher
VCP2 (A20–4) or VCP2 (E9–27) – Body ground10 kΩ or higher
(d) Reconnect the accelerator pedal position sensor connec-
tor.
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK