2005 TOYOTA AVENSIS Circuit

A81013
ECM
+BMREL IGSW J27
9
B±W I13
Ignition Switch
6IGNB±W E
E1
EE110BR
W±B 1Driver Side J/B
2 2
1E9
E9
E98
1
7
E12 J26A
B±W
C C B±W
J8
J/C DA 18
DH2
4
B±Y
EFI51
32 EFI
MAIN
Relay
B±W Engine Room R/B No. 1IK1
8J/C
IE12
BR B±R
Battery AM2B±W
EC
EI
AM2 IG2
GR
B B
33
Engine Room R/B No. 3
FL MAIN1 1
1 1A1 1
1 1 B±R B±R
IE4 1(LHD)
IP1
1(RHD)B±W (RHD) (RHD)
(LHD)
(LHD)
GR 05±686
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
ECM POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to terminal IGSW of the ECM and
the EFI MAIN relay (Marked: EFI MAIN) control circuit in the ECM sends a signal to terminal MREL of the
ECM switching on the EFI MAIN relay.
This signal causes current to flow to the coil, closing the contacts of the EFI MAIN relay and supplying power
to terminal +B of the ECM.
If the ignition switch is turned off, the ECM continues to switch on the EFI MAIN relay for a maximum of 2
seconds for the initial setting of the throttle valve.
WIRING DIAGRAM
05B5V±03

A18294
E1 (±)+B (+)
ECM Connecter
E12E9
A65745
E12
ECM Connector
E1
A18294
E1 (±)IGSW (+)
ECM Connecter
E9
E12
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±687
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1INSPECT ECM(+B VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between the specified terminals of
the E9 and E12 ECM connectors.
Standard:
Symbols (Terminal No.)Specified condition
+B (E9±1) ± E1 (E12±7)9 to 14 V
OKPROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
(See page 05±551)
NG
2 CHECK HARNESS AND CONNECTOR(ECM ± BODY GROUND)
(a) Disconnect the E12 ECM connector.
(b) Check for continuity between the wire harness side con- nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
E1 (E12±7) ± Body groundContinuity
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3 INSPECT ECM(IGSW VOLTAGE)
(a) Turn the ignition switch ON.
(b) Measure the voltage between the specified terminals of the E9 and E12 ECM connectors.
Standard:
Symbols (Terminal No.)Specified condition
IGSW (E9±9) ± E1 (E12±7)9 to 14 V
OK Go to step 6
NG

±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±685
AVENSIS REPAIR MANUAL (RM1018E)
DTCP2227BAROMETRIC PRESSURE CIRCUIT
RANGE/PERFORMANCE
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
P2227Atmospheric pressure sensor malfunction
(2 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.
1CHECK OTHER DTC OUTPUT(BESIDES DTC P2227)
(a)Read the DTC using the hand±held tester. Result:
Display (DTC output)Proceed to
P2227 and other DTCs are outputA
Only P2227 is outputB
HINT:
If any other codes besides P2227 are output, perform the troubleshooting f\
or those DTCs first.
BREPLACE ECM (See page 10±65)
A
GO TO RELEVANT DTC CHART (See page 05±544)
05CQ6±01

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

±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±673
AVENSIS REPAIR MANUAL (RM1018E)
DTCP1601INJECTOR CORRECTION CIRCUIT
MALFUNCTION (EEPROM)
CIRCUIT DESCRIPTION
DTC No.DTC Detection ConditionTrouble Area
P1601

Injector compensation value is not registered
(1 trip detection logic)

Wrong injector compensation value is registered
(1 trip detection logic)
Injector compensation code

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.
1CHECK INJECTOR COMPENSATION CODE (See page 05±528)
NGSET INJECTOR COMPENSATION CODE (See page 05±528)
OK
REPLACE ECM (See page 10±65)
05CQ2±01