Page 377 of 5135
123
5
A79099
Wire Harness Side
C8
Circuit Opening Relay Connector
A66276
Fuel Pump Connector
Wire Harness Side
F25
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±271
AVENSIS REPAIR MANUAL (RM1018E)
7CHECK HARNESS AND CONNECTOR(CIRCUIT OPENING RELAY ± FUEL PUMP,
FUEL PUMP ± BODY GROUND)
(a)Remove the circuit opening relay.
(b)Disconnect the fuel pump connector.
(c)Check for continuity between the wire harness side con-
nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
Circuit opening relay (C8±3) ± Fuel pump (F25±4)ContinuityFuel pump (F25±5) ± Body groundContinuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
Circuit opening relay (C8±3) or Fuel pump (F25±4) ±
Body groundNo continuity
NGREPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)
Page 378 of 5135
A76869
Engine Room R/B No.1
Engine Room J/B No.1
EFI
12
1 1A1
B±G
4A
4B 11
Engine
Room J/B No.4
B±G
FL MAIN
Battery
EFBR B±Y
IE3
IO1 77
(LHD)(RHD)B±Y3
E9 BATTECM
E1 7
E12
A66054
Engine Room R/B No.1
EFI Fuse
05±262
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
ECM BACK±UP POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
While the ignition switch is OFF, the battery positive voltage is supplied to terminal BATT of the ECM for the
DTCs memory and air±fuel ratio adaptive control value memory, etc.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 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
05C78±01
Page 379 of 5135

A18294
BATT (+)E1 (±)
ECM Connector
E9E12
A65748
E9
ECM Connector
BATT
A79078
Engine Room R/B No.1 EFI Fuse2
1
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±263
AVENSIS REPAIR MANUAL (RM1018E)
2INSPECT ECM(BATT VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between the terminals of the E9 and
E12 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
BATT (E9±3) ± E1 (E12±7)8 to 14 V
OKCHECK AND REPLACE ECM (See page 01±32)
NG
3 CHECK HARNESS AND CONNECTOR(ECM ± EFI FUSE, EFI FUSE ± BATTERY)
(a) Check the harness and connector between the EFI fuse and ECM.
(1) Remove the EFI fuse from the engine room R/B.
(2) Disconnect the E9 ECM connector.
(3) Check for continuity between the wire harness sideconnectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
EFI fuse (2) ± BATT (E9±3)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
EFI fuse (2) or BATT (E9±3) ± Body groundNo continuity
(b) Check the harness and connector between the EFI fuse and battery.
(1) Remove the EFI fuse from the engine room R/B.
(2) Disconnect the battery positive terminal.
(3) Check for continuity between the wire harness sideconnectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
Battery positive terminal ± EFI fuse (1)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
Battery positive terminal or EFI fuse (1) ± Body groundNo continuity
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK AND REPLACE ENGINE ROOM RELAY BLOCK
Page 380 of 5135

A79123
I13
Ignition SW
4
6
IE4B±R
IP1 1
1(LHD)
B±R
11B±Y B±R
DHIGN
DA18 2Driver Side J/B
22
EFI
1 AM2
1
1A 1
B±GEngine Room
R/B No.1
Engine Room
J/B No.1 (RHD)
14A
14BEngine Room
J/B No.4
B±G
FL MAIN
BatteryB±W
(LHD)B±W
(LHD)
J8
J/C CC B±W
(RHD)B±W
(RHD)
J/C J26 J27AE
ECM
IGSW
E99
GR
IE12
GR
E98
MREL
44
51
EFI
Relay+B 1
E9 B±R
Engine Room
R/B No.4
Engine Room
R/B No.444
4
4E1 7
E12
IK1 8
1
2
EF ECW±B
B±RBR B±W
EFI
No.132
B±R
EA1 12
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
05±257
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 relay (Marking: 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
terminal +B of the ECM.
If the ignition switch is turned off, the ECM continues to switch on the EFI relay for a maximum of 2 seconds
for the initial setting of the throttle valve.
WIRING DIAGRAM
05C77±01
Page 381 of 5135

A18294
E1 (±)+B (+)
ECM Connecter
E12E9
A65746
E1
E2
E13E12
ECM Connecter
A18294ECM Connecter
E12E9
E1 (±)IGSW (+)
05±258
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1INSPECT ECM(+B VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between the terminals of the E9 and E12 ECM connector.
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±168)
NG
2 CHECK HARNESS AND CONNECTOR(ECM ± BODY GROUND)
(a) Disconnect the negative (±) battery terminal.
(b) Disconnect the E12 and E13 ECM connector.
(c) Check for continuity between the wire harness side con- nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
E1 (E12±7) ± Body groundContinuityE2 (E13±28) ± 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 terminals of the E9 and E12 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
IGSW (E9±9) ± E1 (E12±7)9 to 14 V
OK Go to step 6
NG
Page 382 of 5135

A79096
Driver Side J/B
IGN Fuse
B50489Ignition Switch
I13
A18294ECM Connecter
E12E9
E1 (±)MREL (+)
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
05±259
AVENSIS REPAIR MANUAL (RM1018E)
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
NG CHECK FOR SHORT IN ALL HARNESSES AND
COMPONENTS CONNECTED FUSE
OK
5 INSPECT IGNITION OR STARTER SWITCH ASSY
(a) Measure the resistance between the connector terminals
shown in the chart below.
SwitchTerminal No.Resisitance
LOCKAll Terminals1M or more
ACC1±31 or less
ON1±2, 1±3, 2±3, 5±61 or less
START4±5, 4±6, 5±6, 1±21 or less
NG REPLACE IGNITION OR STARTER SWITCH
ASSY
OK
CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY ± IGNITION SWITCH, IGNITION
SWITCH ± ECM)
6 INSPECT ECM(MREL VOLTAGE)
(a) Turn the ignition switch ON.
(b) Measure the voltage between the terminals of the E9 and
E12 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
MREL (E9±8) ± E1 (E12±7)9 to 14 V
NG CHECK AND REPLACE ECM
OK
Page 383 of 5135
A66054
Engine Room R/B No.1
EFI Fuse
B16200
A79065
Engine Room R/B No.4
EFI No.1 Fuse
05±260
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
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 RELAY
(a) Remove the EFI relay from the engine room R/B No.4.
(b) Inspect the EFI relay.
Standard:
Terminal No.Specified condition
1 ± 2Continuity
No Continuity
3 ± 5Continuity
(Apply battery voltage Terminals 1 and 2)
NG REPLACE EFI RELAY
OK
9 CHECK FUSE(EFI No,1 FUSE)
(a) Remove the EFI No.4 fuse from the engine room R/B
No.4.
(b) Check for continuity in the EFI No.4 fuse.
Standard: Continuity
NG CHECK FOR SHORT IN ALL HARNESSES AND
COMPONENTS CONNECTED FUSE
OK
Page 384 of 5135

A66053
Engine Room R/B No.4
EFI Relay
A79066
Engine Room R/B No.4
EFI No.1 Fuse
1
2
A65748
MREL
E9
ECM Connector
+B
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
05±261
AVENSIS REPAIR MANUAL (RM1018E)
10 CHECK HARNESS AND CONNECTOR(EFI RELAY ± ECM, EFI RELAY ± BODY
GROUND)
(a) Check the harness and connector between the EFI relay
and 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 for continuity between the wire harness side
connectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
EFI relay (1) ± MREL (E9±8)
EFI relay (3) ± EFI No.1 fuse (1)Continuity
EFI No.1 fuse (2) ± +B (E9±1)
y
Standard (Check for short):
Symbols (Terminal No.)Specified condition
EFI relay (1) or MREL (E9±8) ± Body ground
EFI relay (3) or EFI No.1 fuse (1) ± Body groundNo continuity
EFI No.1 fuse (2) or +B (E9±1) ± Body ground
y
(b) Check the harness and connector between the EFI relay
and body ground.
(1) Remove the EFI relay from the engine room J/B
No.4.
(2) Check for continuity between the wire harness side
connector and the body ground.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
EFI 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)