engine TOYOTA AVENSIS 2005 Service Repair Manual

–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–19
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
4. CLEAR DTCs AND FREEZE FRAME DATA
(not using the intelligent tester II)
(a) Remove the EFI and ETCS fuse from the engine room
R/B for more than 60 seconds, or disconnect the negative
battery cable for more than 60 seconds. When discon-
necting the negative battery cable, perform the ”INI-
TIALIZE” procedure ( see page 05–1 ).

054KK–23
A66714
E13
E12
E10
E9
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–13
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
TERMINALS OF ECM
HINT:
Each ECM terminal’s standard normal voltage is shown in the table below.
In the table, first follow the information under ”Condition.” Look under ”Symbols (Terminals No.)” for the termi-
nals to be inspected. The standard normal voltage between the terminals is shown under ”STD Voltage.”
Use the illustration above as a reference for the ECM terminals.
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSTD Voltage
BATT (E9–3) – E1 (E13–5)B–Y – BR
Battery (for measuring the
battery voltage and for the
ECM memory)
Always9 to 14 V
+BM (E10–6) – ME01 (E12–3)G–Y – W–BPower source of throttle
motorAlways9 to 14 V
IGSW (E9–9) – E1 (E13–5)B–W – BRIgnition switchIgnition switch ON9 to 14 V
+B (E9–1) – E1 (E13–5)B–R – BRPower source of ECMIgnition switch ON9 to 14 V
MREL (E10–4) – E01 (E13–7)GR – W–BEFI relayIgnition switch ON9 to 14 V
VC (E13–18) – E2 (E13–28)R–W – BRPower source of sensor
(a specific voltage)Ignition switch ON4.5 to 5.5 V
VTA1 (E13–21) – E2 (E13–28)L–W – BRThrottle position sensor
(for engine control)Ignition switch ON, Accelerator ped-
al fully released0.4 to 1.0 V
VTA1 (E13–21) – E2 (E13–28)L–W – BRThrottle position sensor
(for engine control)Ignition switch ON, Accelerator ped-
al fully depressed3.2 to 4.8 V
VTA2 (E13–31) – E2 (E13–28)B–R – BR
Throttle position sensor
(for sensor malfunction
detection)Ignition switch ON, Accelerator ped-
al fully released2.1 to 3.1 V
VTA2 (E13–31) – E2 (E13–28)B–R – BR
Throttle position sensor
(for sensor malfunction
detection)Ignition switch ON, Accelerator ped-
al fully depressed4.5 to 5.0 V
VPA (E9–22) – EPA (E9–28)G – Y
Accelerator pedal position
sensor (for engine con-
trol)Ignition switch ON, Accelerator ped-
al fully released0.5 to 1.1 V
VPA (E9–22) – EPA (E9–28)G – Y
Accelerator pedal position
sensor (for engine con-
trol)Ignition switch ON, Accelerator ped-
al fully depressed2.6 to 4.5 V
VPA2 (E9–23) – EPA2 (E9–29)W – Y
Accelerator pedal position
sensor (for sensor mal-
function detection)Ignition switch ON, Accelerator ped-
al fully released1.2 to 2.0 V
VPA2 (E9–23) – EPA2 (E9–29)W – Y
Accelerator pedal position
sensor (for sensor mal-
function detection)Ignition switch ON, Accelerator ped-
al fully depressed3.4 to 5.0 V

05–14
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E) Symbols (Terminals No.)
STD Voltage
Condition
Terminal Description
Wiring Color
VCPA (E9–26) – EPA (E9–28)B – Y
Power source of acceler-
ator pedal position sensor
(for VPA)
Ignition switch ON4.5 to 5.0 V
VCP2 (E9–27) – EPA2 (E9–29)B – Y
Power source of acceler-
ator pedal position sensor
(for VPA2)
Ignition switch ON4.5 to 5.0 V
VG (E13–30) – EVG (E13–29)G – L–YMass air flow meterIdling, Shift position P or N, A/C
switch OFF0.5 to 3.0 V
THA (E13–20) – E2 (E13–28)G–R – BRIntake air temperature
sensorIdling, Intake air temperature 20
C
(68
F)0.5 to 3.4 V
THW (E13–19) – E2 (E13–28)B–W – BREngine coolant tempera-
ture sensorIdling, Engine coolant temperature
80
 
\b0.2 to 1.0 V
#10 (E13–1) – E01 (E13–7)
#20 (E13–2) – E01 (E13–7)
#30 (E13–3) – E01 (E13–7)
#40 (E13–4) – E01 (E13–7)B–R – W–B
Y – W–B
W – W–B
B – W–B
InjectorIgnition switch ON9 to 14 V
#10 (E13–1) – E01 (E13–7)
#20 (E13–2) – E01 (E13–7)
#30 (E13–3) – E01 (E13–7)
#40 (E13–4) – E01 (E13–7)B–R – W–B Y – W–B
W – W–B
B – W–B
InjectorIdlingPulse generation
( See page 05– 118 )
IGT1 (E13–8) – E1 (E13–5)
IGT2 (E13–9) – E1 (E13–5)
IGT3 (E13–10) – E1 (E13–5)
IGT4 (E13–11) – E1 (E13–5)R–W – BR
P – BR
LG–B – BR
L–Y – BR
Ignition coil with igniter
(ignition signal)IdlingPulse generation
( See page 05–143 )
IGF (E13–24) – E1 (E13–5)W–R – BR
Ignition coil with igniter
(ignition confirmation sig-
nal)
Ignition switch ON4.5 to 5.5 V
IGF (E13–24) – E1 (E13–5)W–R – BR
Ignition coil with igniter
(ignition confirmation sig-
nal)
IdlingPulse generation
( See page 05–143 )
G2+ (E13–26) – NE– (E13–34)W – RCamshaft position sensorIdlingPulse generation
( See page 05–140 )
NE+ (E13–27) – NE– (E13–34)G – RCrankshaft position sen-
sorIdlingPulse generation
( See page 05–136 )
FC (E10–16) – E01 (E13–7)G–Y – W–BFuel pump controlIgnition switch ON9 to 14 V
M+ (E12–5) – E01 (E13–7)
M– (E12–4) – E01 (E13–7)B – W–B
W – W–BThrottle actuatorIdlingPulse generation
OX1A (E12–22) – E2 (E13–28)B – BRHeated oxygen sensor
Maintain engine speed at 2,500 rpm
for 2 minutes after warming up the
sensorPulse generation
( See page 05–74 )
OX1B (E10–23)
– E2– (E13–28)B – BRHeated oxygen sensor
Maintain engine speed at 2,500 rpm
for 2 minutes after warming up the
sensorPulse generation
( See page 05–100 )
HT1A (E12–6) – E03 (E12–7)
HT1B (E9–7) – E03 (E12–7)Y – W–B
P – W–BHeated oxygen sensor
heaterIdlingBelow 3.0 V
HT1A (E12–6) – E03 (E12–7)
HT1B (E9–7) – E03 (E12–7)Y – W–B
P – W–BHeated oxygen sensor
heaterIgnition switch ON9 to 14 V
KNK1 (E12–1) – EKNK (E12–2)B – WKnock sensorMaintain engine speed at 4,000 rpm
after warming up the enginePulse generation
( See page 05–132 )
OCV+ (E13–14)
– OCV– (E13–13)W–G – Y–BCamshaft timing oil con-
trol valve (OCV)Ignition switch ONPulse generation
( See page 05–34 )
EVP1 (E12–19) – E01 (E13–7)W–G – W–BEVAP VSVIgnition switch ON9 to 14 V
EVP1 (E12–19) – E01 (E13–7)W–G – W–BEVAP VSVIdlingPulse generation
STA (E13–12) – E1 (E13–5)B–Y – BRStarter signalShift position N, Ignition switch
START6.0 V or more

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DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–15
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)Symbols (Terminals No.)
STD Voltage
Condition
Terminal Description
Wiring Color
STP (E10–19) – E1 (E13–5)G–W – BRStop lamp switchBrake pedal depressed9 to 14 V
STP (E10–19) – E1 (E13–5)G–W – BRStop lamp switchBrake pedal releasedBelow 1.5 V
ST1– (E10–12) – E1 (E13–5)G–W – BRStop lamp switchIgnition switch ON, Brake pedal de-
pressedBelow 1.5 V
ST1– (E10–12) – E1 (E13–5)G–W – BRStop lamp switchIgnition switch ON, Brake pedal re-
leased7.5 to 14 V
W (E9–11) – E01 (E13–7)W – W–BMILIdling9 to 14 V
W (E9–11) – E01 (E13–7)W – W–BMILIgnition switch ONBelow 3.0 V
TACH (E10–3) – E1 (E13–5)GR–R – BREngine speedIdlingPulse generation
SPD (E10–17) – E01 (E13–7)V–W – W–BSpeed signal from com-
bination meterIgnition switch ON, Rotate driving
wheel slowlyPulse generation
( See page 05–158 )
TC (E9–20) – E1 (E13–5)W–L – BRTerminal TC of DLC3Ignition switch ON9 to 14 V
SIL (E10–15) – E1 (E13–5)W–G – BRTerminal SIL of DLC3Connect the intelligent tester ll to
the DLC3Pulse generation
ELS (E9–12) – E1 (E13–5)G – BRElectric loadTaillamp switch OFF0 to 1.5 V
ELS (E9–12) – E1 (E13–5)G – BRElectric loadTaillamp switch ON9 to 14 V
F/PS (E9–14) – E1 (E13–5)LG–B – BRAirbag sensor assemblyIgnition switch ONBelow 1.5 V

05–106
–
DIAGNOSTICS SFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
DTC P0171 SYSTEM TOO LEAN (BANK 1)
DTC P0172 SYSTEM TOO RICH (BANK 1)
CIRCUIT DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the bas\
ic injection time. The fuel trim in-
cludes the short–term fuel trim and the long–term fuel trim.
The short–term fuel trim is the short–term fuel compensation used to \
maintain the air–fuel ratio at its ideal
theoretical value. The signal from the heated oxygen sensor indicates whether the air–fuel r\
atio is rich or
lean compared to the ideal theoretical value, triggering a reduction in the \
fuel volume if the air–fuel ratio is
rich, and an increase in the fuel volume if it is lean.
The long–term fuel trim is the overall fuel compensation in order to bal\
ance the short–term fuel trim for a
continual deviation from the central value by individual engine differences, operating environment and age
deterioration.
If both the short–term fuel trim and the long–term fuel trim are l\
ean or rich beyond a standard level, it is de-
tected as a malfunction in the SFI system. The ECM illuminates the MIL and the\
DTC is set.
DTC No.DTC Detection 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
 Mass air flow meter
 Engine coolant temperature sensor
 Fuel pressure
 Gas leakage in exhaust system
 Open or short in heated oxygen sensor (sensor 1) circuit
 Heated oxygen sensor (sensor 1)
 PCV valve and hose
 PCV hose connection
 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 leakage or blockage
 Mass air flow meter
 Engine coolant temperature sensor
 Ignition system
 Fuel pressure
 Gas leakage in exhaust system
 Open or short in heated oxygen sensor (sensor 1) circuit
 Heated oxygen sensor (sensor 1)
 ECM
HINT:
When DTC P0171 is set, the actual air–fuel ratio is lean. When DTC P0172 is set, the actual air–fuel\

ratio is rich.
If the vehicle runs out of fuel, the air–fuel ratio is lean and DTC P01\
71 may be set. The MIL then illumi-
nates.
If the total of the short–term fuel trim value and long–term fuel trim value is within
20 %, the system
is functioning normally.
WIRING DIAGRAM
Refer to DTC P0130 on page 05–74.
05KO5–02

– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–107
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
INSPECTION PROCEDURE
HINT:
Intelligent tester II only:
Malfunctioning areas can be found using the Active Test / A/F Control operation. The A/F Control operation
can determine if the heated oxygen sensor or other potential trouble areas are malfunctioning or not.
(a) Perform the Active Test using the intelligent tester II.
HINT:
The A/F Control operation lowers the injection volume by 12.5 % or increases the injection volume by 25
%.
(1) Connect the intelligent tester II to the DLC3.
(2) Start the engine and turn the intelligent tester II ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 3 minutes.
(4) On the intelligent tester II, select the following menu items: Powertrain / Engine and ECT / Active
Test / A/F Control.
(5) Select the following monitor items: O2S B1 S1 and O2S B1 S2.
(6) Perform the A/F Control operation with the engine in an idling condition (press the right or left
button).
Result:
The heated oxygen sensor reacts in accordance with increases and decreases of the injection
volume:
+25 % → Rich output: More than 0.5 V
–12.5 % → Lean output: Less than 0.4 V
NOTICE:
Sensor 1 (front sensor) has an output delay of a few seconds. Sensor 2 (rear sensor) has a maximum
output delay of approximately 20 seconds.

+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Case 1
Case 2
Case 3
Case 4
Output Voltage of Heated Oxygen
Sensor (sensor 1: front sensor)
Injection volume
Output voltage
Output Voltage of Heated Oxygen
Sensor (sensor 2: rear sensor)Main Suspect
Trouble Area
OK
+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
Sensor 1: front sensor
(Sensor 1, heater, sensor 1
circuit)
+25 %
–12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
+25 %
–12.5 %
Injection volume
Output voltage
NG
+25 %
–12.5 %
Injection volume
Output voltage
NG
+25 %
–12.5 %
Injection volume
Output voltage
NG
+25 %
–12.5 %
Injection volume
Output voltage
NGExtremely rich or lean actual
air–fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost no reaction

Sensor 2: rear sensor
(Sensor 2, heater, sensor 2
circuit)
Almost no reaction Almost no reactionAlmost no reaction
05–108
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
The following A/F Control procedure enables the technician to check and graph the voltage output of both
the heated oxygen sensors.
To display the graph, select the following menu items on the tester: View / Line Graph.
NOTICE:
If the vehicle is short of fuel, the air–fuel ratio becomes lean and the heated oxygen sensor DTCs will
be recorded, and the MIL then illuminates.
HINT:
Read freeze frame data using the intelligent tester II. Freeze frame data record the engine condition
when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the
vehicle was moving or stationary, if the engine was warmed up or not, if the air–fuel ratio was lean or
rich, and other data from the time the malfunction occurred.
A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air–fuel
mixture. Check for conditions that would cause the engine to run rich.
A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air–fuel mix-
ture. Check for conditions that would cause the engine to run lean.

//
30
20
10
5
3
02040 0.11
0.3
0.2 0.52
60 80 100 –20
(–4) (104) (140) (176)(32) (68) (212)
A81700
Ohmmeter
Acceptable
Temperature C (F)
Resistance kΩ
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–111
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
5 INSPECT ENGINE COOLANT TEMPERATURE SENSOR(RESISTANCE)
(a) Remove the engine coolant temperature sensor.
(b) Measure the resistance between the terminals of the en-
gine coolant temperature sensor.
Standard:
Tester ConnectionSpecified Condition
1 – 22.32 to 2.59 kΩ at 20C (68F)
1 – 20.310 to 0.326 kΩ at 80C (176F)
NOTICE:
When checking the engine coolant temperature sensor in
water, be careful not to allow water to get in contact with the
terminals. After checking, dry the sensor.
HINT:
Alternative procedure: Connect an ohmmeter to the installed
engine coolant temperature sensor and read the resistance.
Use an infrared thermometer to measure the engine tempera-
ture in the immediate vicinity of the sensor. Compare these val-
ues against the resistance/temperature graph. Change the en-
gine temperature (warm up or allow to cool down) and repeat
the test.
NG REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
OK
6 CHECK FOR SPARK AND IGNITION
(See page 18–3 of Pub. No. RM1018E AVENSIS)
OK: The spark occurs.
NG REPAIR OR REPLACE
OK
7 CHECK FUEL PRESSURE (See page 11–5 of Pub. No. RM1018E AVENSIS)
(a) Check the fuel pressure (high or low pressure).
NG CHECK AND REPLACE FUEL SYSTEM
OK
8 CHECK FOR EXHAUST GAS LEAKAGE
OK: No gas leak.
NG REPAIR OR REPLACE EXHAUST GAS
LEAKAGE POINT
OK

A97090
A93649
+B HT
E1 Component Side:
Front View Heated Oxygen Sensor Connector
Sensor 1
OX
05–112
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
9 READ VALUE OF INTELLIGENT TESTER II(OUTPUT VOLTAGE OF HEATED
OXYGEN SENSOR)
(a) Connect the intelligent tester II to the DLC3.
(b) Start the engine and turn the intelligent tester II ON.
(c) Select the following menu items: Powertrain / Engine and ECT / Data List / O2S B1 S1.
(d) Warm up the heated oxygen sensor at the engine speed of 2,500 rpm for approximately 90 seconds.
(e) Read the output voltage of the heated oxygen sensor during engine idling.
Standard:
Fluctuates between less than 0.4 V and more than 0.5 V (see the following figure).
OK Go to step 17
NG
10 INSPECT HEATED OXYGEN SENSOR(HEATER RESISTANCE)
(a) Disconnect the H7 heated oxygen sensor connector.
(b) Measure the resistance between the terminals of the
heated oxygen sensor connector.
Standard:
Tester ConnectionSpecified Condition
1 (HT) – 2 (+B)5 to 10 Ω at 20C (68F)
1 (HT) – 4 (E1)10 kΩ or higher
(c) Reconnect the heated oxygen sensor connector.
NG REPLACE HEATED OXYGEN SENSOR
OK

B16200
– DIAGNOSTICSSFI SYSTEM (1ZZ–FE/3ZZ–FE)(From February, 2004)
05–113
AVENSIS REPAIR MANUAL SUPPLEMENT
(RM1098E)
11 INSPECT EFI RELAY
(a) Remove the EFI relay from the engine room R/B No. 4.
(b) Check the EFI relay resistance.
Standard:
Tester ConnectionSpecified Condition
3 – 510 kΩ or higher
3 – 5Below 1 Ω
(Apply battery voltage to terminals 1 and 2)
(c) Reinstall the EFI relay.
NG REPLACE EFI RELAY
OK