2005 TOYOTA AVENSIS diagram

SFI
SFISFI
SFISFI
SFI
D25842

Circuit Description
The major role and, operation of the circuit
and its component parts are explained.

Diagnostic Trouble Code No. and Detection Item

Indicates the diagnostic trouble codes, diagnostic
trouble code settings and suspect areas for a
problem.
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow, SB = Sky Blue
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe.
Inspection Procedures
Use the inspection procedures to determine
if the circuit is normal or abnormal. If it is ab-
normal, use it to determine whether the prob-
lem is located in the sensors, actuators, wire
harness or ECU.

Indicates the condition of the connector of the ECU
during the check.


Connections of tester are
indicated by (+), (±) after
terminals name.
Connector being checked
is connected.Connector being checked
is disconnected.
For inspection of connector
with body ground, there is
nothing about the body
ground written down.
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01±31
AVENSIS REPAIR MANUAL (RM1018E)
CIRCUIT INSPECTION
How to read and use each page is shown below.

A79052
A6
Mass Air Flow MeterECM
1
3 EVG
VG
L±Y
G
2
B±R 12
EA1 32
E12
24
E12
B±R
From
Terminal 2 of
EFI No.1 Fuse
(See Page 05±124)
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
05±25
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using \f \b\f\f
 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, the air±fuel ratio was lea\
n or rich, etc. at the time of the mal-
function.
1READ VALUE OF HAND±HELD TESTER(MASS AIR FLOW RATE)
(a)Connect the hand±held tester to the DLC3.
(b)Start the engine.
(c)Read air flow rate on the hand±held tester.
(d)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / MAFº and read its value displayed on the hand±held tester.
Result:
Air flow rate (gm/sec)Proceed to
0.0A
271.0 or moreB
1 less than Mass Air Flow Rate less than 270.0 or more (*1)C
*1: The value must be changed when the throttle valve is opend or closed.
BGo to step 6
CCHECK FOR INTERMITTENT PROBLEMS(See Page 05±5)
A

A12490
Injector Signal Waveform
20 V/
Division
GND GND(Magnification)
20 V/
Division
50 m sec. / Division (Idling) 1 m sec. / Division (Idling)
Infection duration
A79071
From
Terminal 3
of IG2 Relay
(See Page 05±124)
R±BR±B
1
2
I5 Injector No. 1
B±RE131
#10
R±B 1
2
I6 Injector No. 2
YE132
#20
R±B 1 2
I7 Injector No. 3
WE133
#30
R±B 1 2
I8 Injector No. 4
BE134
#40 ECM
R±B
EA1
8
05±74
±
DIAGNOSTICS SFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
Reference: Inspection using an oscilloscope for injector signal waveform. (1) With the engine idling, check the waveforms between terminals #1 ± #4 and E1 of the ECM con-nector.
HINT:
The correct waveforms are shown below.
WIRING DIAGRAM

±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
05±67
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0171SYSTEM TOO LEAN (FUEL TRIM) (BANK 1)
DTCP0172SYSTEM TOO RICH (FUEL TRIM) (BANK 1)
CIRCUIT DESCRIPTION
Fuel trim refers to the feedback compensation value compared against the basic injection time. Fuel trim
includes short±term fuel trim and long±term fuel trim.
Short±term fuel trim is the short±term fuel compensation used to maintain the a\
ir±fuel ratio at stoichiometric
air±fuel ratio. The signal from the heated oxygen sensor indicates whether the a\
ir±fuel ratio is RICH or LEAN
compared to the stoichiometric air±fuel ratio, This variance triggers a reduc\
tion in fuel volume if the air±fuel
ratio is rich, and an increase in the fuel volume if it is lean.
Long±term fuel trim is overall fuel compensation carried out long±term to comp\
ensate for a continual devi-
ation of the short±term fuel trim from the central value, due to indi\
vidual engine differences, wear over time
and changes in the operating environment.
If both the short±term fuel trim and long±term fuel trim are LEAN or RICH beyond a certain value, it is de\
-
tected as a malfunction and the CHK ENG is illuminated.
DTC No.DTC Detecting ConditionTrouble Area
P0171
When air fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on LEAN side
(2 trip detection logic)

Air induction system

Injector blockage

PCV hose

Mass air flow meter

Engine coolant temperature sensor

Fuel pressure

Open or short in heated oxygen sensor circuit

Heated oxygen sensor

ECM
P0172
When air fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on RICH side
(2 trip detection logic)

Injector leak, blockage

Mass air flow meter

Engine coolant temperature sensor

Ignition system

Fuel pressure

Open or short in heated oxygen sensor circuit

Gas leakage in exhaust system

Heated oxygen sensor

ECM
HINT:
If the total of the short±term fuel trim value and long±term fuel \
trim value is within
25 %, the system is func-
tioning normally.
WIRING DIAGRAM
Refer to DTC P0125 on page 05±45.
05B3Y±02

±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
05±65
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0135OXYGEN SENSOR HEATER CIRCUIT
MALFUNCTION (BANK 1 SENSOR 1)
DTCP0141OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION (BANK 1 SENSOR 2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page 05±45.
DTC No.DTC Detecting ConditionTrouble Area
P0135

When the heater operates, heater current exceeds 3.5 A
(1 trip detection logic)

Heater current is 0.2 A or less when the heater operates
(1 trip detection logic)
Open or short in heater circuit of heated oxygen sensor

Heated oxygen sensor heater

ECM
P0141

When the heater operates, heater current exceeds 2 A
(1 trip detection logic)

Heater current is 0.2 A or less when the heater operates
(1 trip detection logic)
Open or short in heater circuit of heated oxygen sensor

Heated oxygen sensor heater

ECM
WIRING DIAGRAM
Refer to DTC P0125 on page 05±45.
INSPECTION PROCEDURE
HINT:

If different DTCs that are related to a different system are output simultaneously while terminal E2 is
used as a ground terminal, terminal E2 may be open.

Read freeze frame data using \f \b\f\f
 Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for d\
etermining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ra\
tio was lean or rich, etc. at
the time of the malfunction.
1INSPECT HEATED OXYGEN SENSOR(HEATER RESISTANCE) (See page 05±45)
NG REPLACE HEATED OXYGEN SENSOR
OK
2INSPECT EFI RELAY (See page 10±3)
NG REPLACE EFI RELAY
OK
3CHECK FUSE(EFI No.2) (See page 05±45)
NG CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FUSE
OK
05C6A±01

05±60
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0133OXYGEN SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page 05±45.
DTC NoDTC Detecting ConditionTrouble Area
P0133
Response time for heated oxygen sensor voltage output to
change from rich to lean, or from lean to rich, is 1.0 sec. or
more during idling after engine is warmed up (2 trip detection
logic)

Open or short in heated oxygen sensor circuit

Heated oxygen sensor

Air induction system

Fuel pressure

Injector

ECM
HINT:

 


 \f
\f















\b


\f

 
\f


 
 

\f
 \f
\f


WIRING DIAGRAM
Refer to DTC P0125 on page 05±45.
INSPECTION PROCEDURE
HINT:
Hand±held tester only:
Narrowing down the trouble area is possible by performing ACTIVE TEST of the following \
ºA/F CONTROLº
(heated oxygen sensor or other trouble areas can be distinguished).
(a) Perform ACTIVE TEST using hand±held tester (A/F CONTROL).
HINT:
ºA/F CONTROLº is an ACTIVE TEST which changes the injection volume\
±12.5 % or +25 %.
(1) Connect the hand±held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine with the engine speed at 2,500 rpm for approximately. 90 sec.
(4) Select the item ºDIAGNOSIS / OBD/MOBD / ACTIVE TEST / A/F CONTROLº\
.
(5) Perform ºA/F CONTROLº with the engine in an idle condition (press\
the right or left button).
Result:
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25 %
rich output: More than 0.55 V
±12.5 %
lean output: Less than 0.4 V
NOTICE:
There is a few second delay in the sensor 1 (front sensor) output, and ther\
e is about 20 seconds delay
in the sensor 2 (rear sensor) output.
05B3W±02

05±54
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0130OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 1)
DTCP0136OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page 05±45.
DTC NoDTC Detecting ConditionTrouble Area
P0130Voltage output of heated oxygen sensor remains between
0.40 V and 0.55 V during idling after the engine is warmed up

Open or short in heated oxygen sensor circuit

Heated oxygen sensor

Air induction system

Fuel pressure

Injector

ECM
P0136
Voltage output of heated oxygen sensor remains 0.4 V or more
or 0.5 V or less when vehicle is driven at 30 km/h (19 mph) or
more after the engine is warmed up (2 trip detection loginc)
Open or short in heated oxygen sensor circuit

Heated Oxygen sensor
HINT:

 


 \f
\f















\b


\f

 
\f


 
 

\f
 \f
\f


WIRING DIAGRAM
Refer to DTC P0125 on page 05±45.
05B3V±02

A79067
HT1A
4
E12
Y
OX1A
23
E12
HT1B
4
E10
OX1B
21
E12
B ECM
3 EH
H17
Heated
Oxygen
Sensor
(Bank 1
Sensor 2) H7
Heated
Oxygen
Sensor
(Bank 1
Sensor 1)
B±W
21
4 E2
+B HT
OX B
P
(*1) E2
28
*1: Shielded
BR
From
Terminal 3 of
EFI Relay
(See Page 05±124)
4 4
2 1 EFI
No.2
B±W
EA1
13
B±W
B±W
IK1
10
IH2
1
B±WBR BR BR
BR
IK2
IH2
18
3 E2
+B HT
OX BR
BR
(*1)(*1)
(*1)
(*1) (*1)
(*1) P
BB
J13 J12 E
D
J13
D
J13
E
J12D
J12
D
Junction
Connector IK2
7
IH2 4
IH2
2
Engine Room
R/B No.4
E13
B±W B±W 3
2 1
4
05±46
±
DIAGNOSTICS SFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
HINT:

  
\f\b             !"
   ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALLº.
WIRING DIAGRAM