2005 TOYOTA AVENSIS diagnostic

A83889
R21Radiator fun Relay Connector
Front View
Wire Harness Side:
A81695
E12
ECM Connector FPR
05−248
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
14 CHECK HARNESS AND CONNECTOR(RADIATOR FAN RELAY−ECM)
(a) Check the harness and the connector between the radia-
tor fan relay and the ECM.
(1) Remove the R21 radiator fan relay.
(2) Disconnect the E12 ECM connector.
(3) Check the resistance between the wire harness
side connectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
Radiator Fan relay (R21−3)−FPR (E12−7)Below 1

Standard (Check for short):
Tester ConnectionSpecified Condition
Radiator Fan relay (R21−3) or FPR (E12−7)−Body ground10 k
or higher
(4) Reinstall the radiator fan relay.
(5) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ECM (See page10−65 of Pub. No. RM1018E AVENSIS)

A76879
IP1I13
Ignition Switch
IGN Driver Side J/B
E9
E11ECM
Battery FL MAINEFI
No. 1
2
B−G2
118
9
18 4DH
2
E9E9
1 12 31 5
EFI
Relay
D
EEBR GR B−W
DA
J/C 1A
J28IGSW
+B2 MREL
E1
Engine Room
J/B No. 41 4A
4BEngine Room
R/B No. 1 1EFI
AM2
1 211
1 2
B−G6
(RHD) IE4 1 (LHD)
B−R B−RB−R
4 4
4
4
4
4Engine Room
R/B No. 4
Engine
Room
R/B No. 4B−Y
B−W
B−R
ECW−B
B−RB−R B−R
(RHD) (LHD)
D J14D J28 (RHD)(LHD)
D J14
D
J28 D J141
E9 +B (RHD)
(LHD)B−W
B−W (RHD)
(LHD)B−W
J26A
J27E
J8
J/CJ/C
CC
IE12
GR
(LHD)(RHD)IP1 IE42
3
AM2 IG2
Engine Room
J/B No. 1 05−236
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
ECM POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, the positive battery voltage is applied to terminal IGSW of the ECM
and the EFI relay (Markied: EFI) control circuit in the ECM sends a signal to terminal MREL of the ECM
switching on the EFI relay.
This signal causes current to flow to the coil, closing the contacts of the EFI relay and supplying power to
terminals +B and +B2 of the ECM.
If the ignition switch is turned OFF, the ECM holds the EFI relay on for maximum of 2 seconds to allow for
the initial setting of the throttle valve.
WIRING DIAGRAM
05CK0−02

A67446
E1 (−)+B (+)
ECM Connecter
E11E9
A81698
E1
E11
ECM Connecter
A67446ECM Connecter
E11E9
E1 ( −)IGSW (+)
−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
05 −237
AVENSIS Supplement (RM1045E)
INSPECTION PROCEDURE
1 INSPECT ECM(+B VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the terminals of the E9 and
E11 ECM connectors.
Standard:
Tester ConnectionSpecified Condition
+B (E9 −1) − E1 (E11 −1)9to 14V
OK PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
(See page 05 −1 0)
NG
2 CHECK HARNESS AND CONNECTOR(ECM −BODY GROUND)
(a) Disconnect the negative ( −) battery terminal.
(b) Disconnect the E11 ECM connectors.
(c) Check the resistance between the wire harness side con- nector.
Standard (Check for open):
Tester ConnectionSpecified Condition
E1 (E11 −1) −Body groundBelow 1

(d) Reconnect the ECM connector.
(e) Reconnect the negative battery terminal.
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3 INSPECT ECM(IGSW VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the terminals of the E9 and E11 ECM connectors.
Standard:
Tester ConnectionSpecified Condition
IGSW (E9 −9) −E1 (E11 −1)9to14V
OK Go to step 6
NG

A79096
Driver Side J/B:
IGN Fuse
B68363
I13 LOCK
ACC
ON
START35_ 35_ 55_
A67446ECM Connecter
E11E9
E1 (−)MREL (+)
05−238
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
4 CHECK FUSE(IGN FUSE)
(a) Remove the IGN fuse from the driver side J/B.
(b) Check for continuity in the IGN fuse.
Standard: Continuity
(c) Reinstall the IGN fuse.
NG CHECK FOR SHORT IN ALL HARNESSES AND
COMPONENTS CONNECTED TO FUSE
OK
5 INSPECT IGNITION OR STARTER SWITCH ASSY
(a) Disconnect the I13 ignition switch connector.
(b) Measure the resistance between the connector terminals
shown in the chart below.
Standard:
Switch PositionTester ConnectionSpecified Condition
LOCKAll Terminals10 k
or higher
ACC2−3Below 1

ON1−3, 2−3, 4−6Below 1

START1−3, 4−5, 4−6Below 1

(c) Reconnect the ignition switch connector.
NG REPLACE IGNITION OR STARTER SWITCH
ASSY (GO TO NEXT STEP 6 AFTER THE RE-
PLACEMENT)
OK
CHECK AND REPAIR HARNESS AND CONNECTOR(BATTERY−IGNITION SWITCH, IGNITION
SWITCH−ECM)
6 INSPECT ECM(MREL VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the terminals of the E9 and
E11 ECM connectors.
Standard:
Tester ConnectionSpecified Condition
MREL (E9−8)−E1 (E11−1)9to14V
NG REPLACE ECM (See page10−65 of Pub. No.
RM1018E AVENSIS)
OK

A66054
Engine Room R/B No.1:
EFI Fuse
B16200
A66053A79065
Engine Room R/B No. 4:
EFI No.1 Fuse
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−239
AVENSIS Supplement (RM1045E)
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
(c) Reinstall the EFI fuse.
NG CHECK FOR SHORT IN ALL HARNESSES AND
COMPONENTS CONNECTED TO FUSE
OK
8 INSPECT EFI RELAY
(a) Remove the EFI relay from the engine room R/B No. 4.
(b) Check for continuity in the EFI relay.
Standard:
Tester ConnectionSpecified Condition
1−2Continuity
3−5No Continuity
3−5Continuity
(Apply battery voltage to terminals 1 and 2)
(c) Reinstall the EFI relay.
NG REPLACE EFI RELAY
OK
9 CHECK FUSE(EFI NO.1FUSE)
(a) Remove the EFI No. 1 fuse from the engine room R/B No.
4.
(b) Check for continuity in the EFI No. 1 fuse.
Standard: Continuity
(c) Reinstall the EFI No. 1 fuse.
NG CHECK FOR SHORT IN ALL HARNESSES AND
COMPONENTS CONNECTED TO FUSE
OK

A66053
Engine Room R/B No. 4:
EFI Relay
A66053A79066
Engine Room R/B No. 4:
EFI No.1 Fuse
1
2
A67445
MREL
E9
ECM Connector+B
Wire Harness Side:
05−240
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
10 CHECK HARNESS AND CONNECTOR(EFI RELAY−ECM, EFI RELAY−BODY
GROUND)
(a) Check harness and connector between the EFI relay and
the ECM connector.
(1) Remove the EFI relay from the engine room R/B No.
4.
(2) Remove the EFI No.1 fuse from the engine room
R/B No. 4.
(3) Disconnect the E9 ECM connector.
(4) Check the resistance between the wire harness
side connectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
Engine room R/B No. 4 (EFI relay terminal 1)−MREL (E9−8)Below 1

Engine room R/B No. 4 (EFI relay terminal 3)−
Engine room R/B No. 4 (EFI No. 1 fuse terminal 1)Below 1

Engine room R/B No. 4 (EFI No. 1 fuse terminal 2)−
+B (E9−1)Below 1

Standard (Check for short):
Tester ConnectionSpecified Condition
Engine room R/B No. 4 (EFI relay terminal 1) or
MREL (E9−8)−Body ground10 k
or higher
Engine room R/B No. 4 (EFI relay terminal 3) or
Engine room R/B No. 4 (EFI No. 1 fuse terminal 1)−Body
ground
10 k
or higher
Engine room R/B No. 4 (EFI No. 1 fuse terminal 2) or
+B (E9−1)−Body ground10 k
or higher
(5) Reinstall the EFI relay.
(6) Reinstall the EFI No. 1 fuse.
(7) Reconnect the ECM connector.
(b) Check harness and connector between the EFI relay and
the body ground.
(1) Remove the EFI relay from the engine room R/B No.
4.
(2) Check the resistance between the wire harness
side connector and the body ground.
Standard (Check for open):
Tester ConnectionSpecified Condition
Engine room R/B No. 4 (EFI relay terminal 2)−Body groundBelow 1

(3) Reinstall the EFI relay.
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG
CHECK AND REPAIR HARNESS AND CONNECTOR(TERMINAL +B OF ECM−BATTERY POSITIVE
TERMINAL)

05−224
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
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 repair procedure for the accelerator pedal position sensor.
05CKT−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
(about100˚)
Accelerator Pedal
Position Sensor
Output Voltage (V)
VPA2VPA1 EP2
VCP2
*1:
*
2:
EP1
0.8
105
VCP1*2
*2*1
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−225
AVENSIS Supplement (RM1045E)
CIRCUIT DESCRIPTION
HINT:
SThis Electrical Throttle Control System (ETCS) does not use a throttle cable.
SThis accelerator pedal position sensor is a non−contact type.
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal
position sensor has 2 sensor elements / signal output: VPA1and VPA2. VPA1is used to detect the actual
accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA1. Voltage
change of VPA1and VPA2 change between 0V and 5V depending on the accelerator pedal angle.
The ECM monitors the accelerator pedal angle from VPA1and VPA2 signal output, and controls the throttle
motor based on these signals.