2005 TOYOTA AVENSIS diagnostic

B16200
C8
A18294
FC (+)E1 (±)
ECM Connector
E12E9
05±132
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
3 INSPECT CIRCUIT OPENING RELAY
(a) Remove the circuit opening relay.
(b) Inspect the circuit opening relay.
Standard:
Terminal No.Specified condition
1 ± 2Continuity
No Continuity
3 ± 5Continuity
(Apply battery voltage Terminals 1 and 2)
NG REPLACE CIRCUIT OPENING RELAY
OK
4 INSPECT ECM
(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
FC (E9±10) ± E1 (E12±7)8 to 14 V
OK Go to step 6
NG

A66053
Engine Room R/B No.4EFI Relay
123
5
A79099
Wire Harness Side
C8
Circuit Opening Relay Connector
A65748
E9
MRELFC
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
05±133
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK HARNESS AND CONNECTOR(EFI RELAY ± CIRCUIT OPENING RELAY,
CIRCUIT OPENING RELAY ± ECM)
(a)Remove the EFI relay from the engine room R/B No.4.
(b)Remove the circuit opening relay.
(c)Disconnect the E9 ECM connector.
(d)Check for continuity between the wire harness side con-
nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
EFI relay (3) ± Circuit opening relay (C8±1)
Circuit opening relay (C8±2) ± FC (E9±10)Continuity
EFI relay (1) ± MREL (E9±8)
y
Standard (Check for short):
Symbols (Terminal No.)Specified condition
EFI relay (3) or Circuit opening relay (C8±1) ± Body ground
Circuit opening relay (C8±2) or FC (E9±10) ± Body groundNo continuity
EFI relay (1) or MREL (E9±8) ± Body ground
y
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)
6INSPECT FUEL PUMP ASSY (See page 11±8)
NG REPAIR OR REPLACE FUEL PUMP ASSY
OK

123
5
A79099
Wire Harness Side
C8
Circuit Opening Relay Connector
A66276
Fuel Pump Connector
Wire Harness Side
F25
05±134
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
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 (F24±4)ContinuityFuel pump (F25±5) ± Body groundContinuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
Circuit opening relay (C8±3) or Fuel pump (F24±4) ±
Body groundNo continuity
NGREPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)

05±124
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
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.
05C6G±01

A79085
IE4
IP1
1 1 B±R
4
6
I13
Ignition Switch
B±RDH IGN
16 DL
2
Driver Side J/B
B±W
B
B±R 4
4
1
IG2
Relay
2
3 Engine Room
R/B No.4 ECM
4 4
5
111 B±Y
2
1 112
2
EFI
IG2
AM2
1A B±G Engine Room
R/B No.1 and
Engine Room
J/B No.1 R±B
EA1
8 8
MREL
E9
GR
IE1
2
GR
4
4
51
32 EFI
Relay
4 4
Engine Room
R/B No.4
W±B
W±B
1
1+B
E9
B±R
EC
To Injector
(See page 05±73)
To Ignition Coil
and Igniter
(See page 05±103)
B±R
B±R
EA1
IK1
8
12
Battery
FL MAIN
B±G Engine Room
J/B No.4
4A
4B
1
1
R±B
W±B EFI
No.1
Engine Room
R/B No.4
1 B±W
4
2 4
18
DA B±W
A
J26
Junction Connector
E
J27 B±W
E9IGSW
9
(*2) J8
Junction Connector
(*1) B±W
EH E1
7
E12
BR
(*2)
(*1)
C C
*1: RHD *2: LHD
(*1)
(*2)
±
DIAGNOSTICS SFI SYSTEM (1ZZ±FE/3ZZ±FE)
05±125
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM

A18294
E1 (±)+B (+)
ECM Connecter
E12E9
A65746
E1
E2
E13E12
ECM Connecter
A18294ECM Connecter
E12E9
E1 (±)IGSW (+)
05±126
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±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±5)
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 8
NG

A79096
Driver Side J/B
IGN Fuse
A66055
Engine Room R/B No.1
IG2 Fuse
B16200
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
05±127
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 CHECK FUSE(IG2 FUSE)
(a) Remove the IG2 fuse from the engine room R/B No.1.
(b) Check for continuity in the IG2 fuse.
Standard: Continuity
NG CHECK FOR SHORT IN ALL HARNESSES AND
COMPONENTS CONNECTED FUSE
OK
6 INSPECT IG2 RELAY
(a) Remove the IG2 relay from the engine room R/B No.4.
(b) Inspect the IG2 relay.
Standard:
Terminal No.Specified condition
1 ± 2Continuity
No Continuity
3 ± 5Continuity
(Apply battery voltage Terminals 1 and 2)
NG REPLACE IG2 RELAY
OK

B50489Ignition Switch
I13
A18294ECM Connecter
E12E9
E1 (±)MREL (+)
A66054
Engine Room R/B No.1
EFI Fuse
05±128
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
7 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)
8 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
9 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