TOYOTA AVENSIS 2005 Service Repair Manual

A65748ECM ConnectorE9
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±695
AVENSIS REPAIR MANUAL (RM1018E)
1CLEAR DTC
(a)Connect the hand±held tester to the DLC 3.
(b)Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(c)Read the DTC (See page 05±528).
(d)Clear the DTC (See page 05±528).
(e)Check that the CHK ENG is not illuminated.
Standard: CHK ENG is not illuminated
OKREPAIR CIRCUIT INDICATED BY OUTPUTCODE (See page 05±544)
NG
2CHECK HARNESS AND CONNECTOR(CHECK FOR SHORT IN WIRE HARNESS)
(a)Disconnect the E9 ECM connector.
(b)Turn the ignition switch ON.
(c)Check that the CHK ENG is not illuminated. Standard: CHK ENG is not illuminated
OKREPLACE ECM (See page 10±65)
NG
CHECK AND REPAIR HARNESS AND CONNECTOR
3CHECK ENGINE WARNING LIGHT CONDITION
(a)Check that the CHK ENG is illuminated when the ignition switch is turned\
ON. Standard: CHK ENG is illuminated
OKSYSTEM OK
NG
4INSPECT COMBINATION METER ASSY(CHECK ENGINE WARNING LIGHT CIRCUIT)
(a)See the combination meter troubleshooting on page 05±1509.
NG REPAIR OR REPLACE BULB OR COMBINATIONMETER ASSEMBLY
OK
CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER ± ECM)

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

A79096
Driver Side J/BIGN Fuse
B50489Ignition Switch
I13
A18294
E1 (±)MREL (+)
ECM Connecter
E12E9
05±688
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
4CHECK FUSE(IGN FUSE)
(a)Remove the IGN fuse from the driver side J/B.
(b)Check for continuity in the IGN fuse. Standard: Continuity
NGCHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE
OK
5INSPECT IGNITION OR STARTER SWITCH ASSY
(a)Measure the for continuity between the connector termi- nals shown in the chart below.
SwitchTerminal No.Resisitance
LOCKAll TerminalsNo continuity
ACC1±3Continuity
ON1±2, 1±3, 2±3, 5±6Continuity
START4±5, 4±6, 5±6, 1±2Continuity
NGREPLACE IGNITION OR STARTER SWITCH ASSY
OK
CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY ± IGNITION SWITCH, IGNITION
SWITCH ± ECM)
6INSPECT ECM(MREL 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
MREL (E9±8) ± E1 (E12±7)9 to 14 V
NGREPLACE ECM (See page 10±65)
OK

A66054
Engine Room R/B No.1
EFI Fuse
B16200
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±689
AVENSIS REPAIR MANUAL (RM1018E)
7 CHECK FUSE(EFI FUSE)
(a) Remove the EFI fuse from the engine room R/B No.1.
(b) Check for continuity in the EFI fuse.
Standard: Continuity
NG CHECK FOR SHORT IN ALL HARNESSES AND
COMPONENTS CONNECTED FUSE
OK
8 INSPECT EFI MAIN RELAY
(a) Remove the EFI MAIN relay from the engine room R/B
No.1.
(b) Inspect the EFI MAIN relay.
Standard:
Terminal No.ConditionSpecified condition
1 ± 2ConstantContinuity
UsuallyNo Continuity
3 ± 5Apply B+ between
Terminals 1 and 2Continuity
Terminal No.Specified condition
1 ± 2Continuity
No Continuity
3 ± 5Continuity
(Apply battery voltage terminals 1 and 2)
NG REPLACE EFI MAIN RELAY
OK

A66056
Engine Room R/B No.1
EFI MAIN Relay
A65748
MREL
E9
ECM Connector
05±690
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
9 CHECK HARNESS AND CONNECTOR(EFI MAIN RELAY ± ECM, EFI MAIN RELAY
± BODY GROUND)
(a) Check the harness and connector between the EFI MAIN
relay and ECM connector.
(1) Remove the EFI MAIN relay from the engine room
R/B No.1.
(2) Disconnect the E9 ECM connector.
(3) Check for continuity between the wire harness side
connectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
EFI MAIN relay (1) ± MREL (E9±8)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
EFI MAIN relay (1) or MREL (E9±8) ± Body groundNo continuity
(b) Check the harness and connector between the EFI MAIN
relay and body ground.
(1) Remove the EFI MAIN relay from the engine room
R/B No.1.
(2) Check for continuity between the wire harness side
connector and body ground.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
EFI MAIN relay (2) ± Body groundContinuity
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG
CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF ECM ± BATTERY POS-
ITIVE TERMINAL)

±
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.