coolant TOYOTA AVENSIS 2005 Service Service Manual

05±302
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)Hand±held Tester DisplayDiagnostic Note Normal Condition *
1Measurement Item/Range
(Display)
MAFAir flow rate from MAF sensor/
Min.: 0 gm/s, Max.: 655 gm/s
Idling: 3.2 to 4.7 gm/s

Running without load (2,500
rpm): 13.1 to 18.9 gm/s
If the value is Approximately 0.0
gm/s:

Mass air flow meter power
source circuit open

VG circuit open or short
If the value is 160.0 gm/s or more:

E2G circuit open
MAP
Absolute pressure inside intake
manifold/
Min.: 0 kPa, Max.: 224 kPa
Idling: 22 to 32 kPa

Running without load (2,500
rpm): 20 to 30 kPa
If the value is Approximately 0.0
kPa:

PIM circuit short
If the value is 142.0 kPa or more:

VC circuit open or short

PIM circuit open

E2 circuit open
ENGINE SPDEngine speed/
Min.: 0 rpm, Max.: 16383 rpmIdling: 625 to  rpm

COOLANT TEMPCoolant temperature/
Min.: ±40C, Max.: 140CAfter warming up: 80 to 95C (176
to 203
If the value is ±40C (±40F):

Sensor circuit is open.
INTAKE AIRIntake air temperature/
Min.: ±40C, Max.: 140CEquivalent to Ambient Temp.

Sensor circuit is oen.
If the value is 140C (284F):

Sensor circuit is shorted.
THROTTLE POSAbsolute throttle position sensor/
Min.: 0 %, Max.: 100 %
Throttle fully closed: 10 to 24 %

Throttle fully open: 64 to 96 %Read the value with ignition switch
ON (Do not start engine).
CTP SWClosed throttle position switch/
ON or OFF
Throttle fully closed: ON

Throttle open: OFF

VEHICLE SPDVehicle speed/
Min.: 0 km/h, Max.: 255 km/hActual vehicle speedSpeed indicated on speedometer
ACCEL POS #1
Accelerator pedal position sensor
No.1 output voltage/
Min.: 0 V, Max.: 5 V
Accelerator pedal released:
0.5 to 1.1 V

Accelerator pedal depressed:
2.5 to 4.6 V
Read the value with ignition switch
ON (Do not start engine).
ACCEL POS #2
Accelerator pedal position sensor
No.2 output voltage/
Min.: 0 V, Max.: 5 V
Accelerator pedal released:
1.5 to 2.9 V

Accelerator pedal depressed:
3.5 to 5.5 V
Read the value with ignition switch
ON (Do not start engine).
THROTTLE POS #2Throttle position sensor No.2 out-
put voltage/ Min.: 0 V, Max.: 5 V
Throttle fully closed: 2.1 to 3.1 V

Throttle fully open: 4.5 to 5.5 VRead the value with ignition switch
ON (Do not start engine).
THROTTLE TARGTTarget position of throttle valve/
Min.: 0 V, Max.: 5 VIdling: 0.4 to 1.1 V

THROTTLE OPN DUTYThrottle motor opening duty ratio/
Min.: 0 %, Max.: 100 %Throttle fully closed: 0 %

When accelerator pedal is de-
pressed, duty ratio is increased.

Read the value with ignition
switch ON (Do not start engine)
THROTTLE CLS DUTYThrottle motor closed duty ratio/
Min.: 0 %, Max.: 100 %Throttle fully closed: 0 %

When accelerator pedal is re-
leased quickly, duty ratio is in-
creased.

Read the value with ignition
switch ON (Do not start engine)
THROTTLE MOTWhether or not throttle motor con-
trol is permitted/ ON or OFFIdling: ON

+BM
Whether or not electric throttle
control system power is inputted/
ON or OFF
Idling: ON

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±355
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0116ENGINE COOLANT TEMP. CIRCUIT
RANGE/PERFORMANCE PROBLEM
CIRCUIT DESCRIPTION
Refer to DTC P0115 on page 05±351.
DTC No.DTC Detection ConditionTrouble Area
P0116
When THW is greater than ±40
C (±40
F) but less than 60
C
(140
F), and THA is greater than ±6.7
C (20
F), and when
starting engine, conditions (a) and (b) continue (2 trip detection
logic):
(a)Vehicle speed is changing (Not stable)
(b)THW change is lower than 3
C (5.4
F) from THW since
when starting engine

Cooling system

Engine coolant temperature sensor

Thermostat
INSPECTION PROCEDURE
HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.

Read freeze frame data using the hand±held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for deter\
mining 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.
1READ OUTPUT DTC(IN ADDITION TO P0116)
(a)Read the DTC using the hand±held tester.
Result:
DisplayProceed to
Only ºP0116º is output.A
ºP0116º and other DTCs are output.B
HINT:
If any other codes besides ºP0116º are output, perform the troubleshooting for those DTCs first.
BGO TO RELEVANT DTC CHART (See page 05±309)
A
2INSPECT THERMOSTAT (See page 16±27)
NGREPLACE THERMOSTAT (See page 16±35)
OK
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
05CK2±01

A72925
ECM
THW
E2 19
E13
28
E13 BR B±W
1 2 E2
Engine Coolant Temperature Sensor
5V
R
E1
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±351
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0115 ENGINE COOLANT TEMPERATURE CIRCUIT
DTC P0117 ENGINE COOLANT TEMPERATURE CIRCUIT
LOW INPUT
DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT
HIGH INPUT
CIRCUIT DESCRIPTION
A thermistor is built in the engine coolant temperature sensor and changes the resistance value according
to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as those of the intake air temperature
sensor.
If the ECM detects the DTC ºP0115, P0117 or P0118º, it operates the fail±safe functions in which the engine
coolant temperature is assumed to be 80C (176F).
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0115Step 1
Open or short in engine cool-
ant temp. sensor circuit for
0.5 sec.
Open or short in engine coolant temperature sensor circuit

Engine coolant temperature sensor

ECM
P0117Step 4Short in engine coolant temp.
sensor circuit for 0.5 sec.
Short in engine coolant temperature sensor circuit

Engine coolant temperature sensor

ECM
P0118Step 2Open in engine coolant temp.
sensor circuit for 0.5 sec.
Open in engine coolant temperature sensor circuit

Engine coolant temperature sensor

ECM
HINT:
After confirming DTC ºP0115, P0117 or P0118º, use the hand±held tester to confirm the engine coolant tem-
perature from the ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALLº.
Temperature DisplayedMalfunction
±40 C (±40 F)Open circuit
140  (284   Short circuit
WIRING DIAGRAM
05CJH±01

05±352
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.

Read freeze frame data using the hand±held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean or rich, etc. at
the time of the malfunction.
1 READ VALUE OF HAND±HELD TESTER(ENGINE COOLANT TEMPERATURE)
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Push the hand±held tester main switch ON.
(d) Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value
displayed on the hand±held tester.
Temperature: Same value as the actual engine coolant temperature
Result:
DisplayProceed to
±40C (±40
)A
140C (284
) or moreB
OK (Same as present temperature)C
HINT:

If there is an open circuit, the hand±held tester indicates ±40C (±40F).

If there is a short circuit, the hand±held tester indicates 140C (284F) or more.
B Go to step 4
C CHECK FOR INTERMITTENT PROBLEMS
A

A75743
Engine Coolant
Temp. SensorECM
A76786
Wire Harness Side
Engine Coolant Temperature
Sensor ConnectorE2
A75742
Engine Coolant
Temp. Sensor
ECM
A76903
THW
E2
E13ECM Connector
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±353
AVENSIS REPAIR MANUAL (RM1018E)
2READ VALUE OF HAND±HELD TESTER(CHECK FOR OPEN IN HARNESS)
(a)Disconnect the E2 engine coolant temperature sensor
connector.
(b)Connect terminals 1 and 2 of the engine coolant tempera- ture sensor wire harness side connector.
(c)Connect the hand±held tester to the DLC3.
(d)Turn the ignition switch ON.
(e)Push the hand±held tester main switch ON.
(f)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value displayed on
the hand±held tester.
Temperature value: 140
C (284
F) or more
OKCONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMP.
SENSOR
NG
3READ VALUE OF HAND±HELD TESTER(CHECK FOR OPEN IN ECM)
(a)Disconnect the E2 engine coolant temperature sensor connector.
(b)Connect terminals THW and E2 of the E13 ECM connec-
tor.
HINT:
Before checking, do a visual and contact pressure check for the
ECM connector.
(c)Connect the hand±held tester to the DLC3.
(d)Turn the ignition switch ON.
(e)Push the hand±held tester main switch ON.
(f)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value displayed on
the hand±held tester.
Temperature value: 140
C (284
F) or more
OKREPAIR OR REPLACE HARNESS OR CONNECTOR
NG
CONFIRM GOOD CONNECTION AT ECM. IF OK, CHECK AND REPLACE ECM (See page 01±32)

A75766
Engine Coolant
Temp. SensorECM
A75744
Engine Coolant
Temp. SensorECM
A81699
E13
ECM Connector
05±354
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
4READ VALUE OF HAND±HELD TESTER(CHECK FOR SHORT IN HARNESS)
(a)Disconnect the E2 engine coolant temperature sensor connector.
(b)Connect the hand±held tester to the DLC3.
(c)Turn the ignition switch ON.
(d)Push the hand±held tester main switch ON.
(e)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value displayed on
the hand±held tester.
Temperature value: ±40
C (±40
F)
OKREPLACE ENGINE COOLANT TEMPERATURE SENSOR
NG
5READ VALUE OF HAND±HELD TESTER(CHECK FOR SHORT IN ECM)
(a)Disconnect the E13 ECM connector.
(b)Connect the hand±held tester to the DLC3.
(c)Turn the ignition switch ON.
(d)Push the hand±held tester main switch ON.
(e)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value displayed on
the hand±held tester.
Temperature: ±40
C (±40
F)
OKREPAIR OR REPLACE HARNESS OR CONNECTOR
NG
CHECK AND REPLACE ECM (See page 01±32)

A71007
Air Flow Meter Crankshaft Position Sensor
Actual Valve TimingCorrection Target Valve Timing
Feedback
Duty Control ECM
Camshaft Timing
Oil Control
Valve (OCV)
Vehicle Speed Signal Engine Coolant Temp. SensorThrottle Position Sensor
Camshaft Position Sensor
05±322
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0010 CAMSHAFT POSITION ºAº ACTUATOR
CIRCUIT (BANK 1)
HINT:
This is the procedure of oil control valve (OCV).
CIRCUIT DESCRIPTION
The VVT system controls the intake camshaft to provide the optimal valve timing for every driving condition. This control
is performed based on the signals, such conditions as intake air volume, throttle position and engine coolant tempera-
ture.
The ECM controls the oil control valve (OCV), based on the signals output from the sensors. The VVT controller regu-
lates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft
and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions de-
crease under overall driving conditions. Also, the ECM detects the actual valve timing using the signals from the cam-
shaft position sensor and the crankshaft position sensor, and performs feedback control. This is how target valve timing
is achieved by the ECM.
DTC No.DTC Detection ConditionTrouble Area
P0010Open or short in OCV circuit

Open or short in OCV circuit

OCV

ECM
05CDY±01

05CDW±01
A53766
E13E12E11E10E9
05±318
±
DIAGNOSTICS SFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
TERMINALS OF ECM
Symbols (Terminal No.)Wiring ColorConditionSTD Voltage (V)
BATT (E9±3) ± E1 (E11±1)B±Y ± BRAlways9 to 14
+BM (E10±6) ± E1 (E11±1)G±Y ± BRAlways9 to 14
IGSW (E9±9) ± E1 (E11±1)B±W ± BRIG switch ON9 to 14
+B (E9±1) ± E1 (E11±1)B±R ± BRIG switch ON9 to 14
+B2 (E9±2) ± E1 (E11±1)B±R ± BRIG switch ON9 to 14
MREL (E9±8) ± E1 (E11±1)GR ± BRIG switch ON9 to 14
IREL (E10±35) ± E1 (E11±1)V ± BRIG switch ON9 to 14
VC (E13±18) ± E2 (E13±28)R±W ± BRIG switch ON4.5 to 5.5
VTA1 (E13 21) E2 (E13 28)LW BRIG switch ON, Accelerator pedal fully released0.4 to 1.0VTA1 (E13±21) ± E2 (E13±28)L±W ± BRIG switch ON, Accelerator pedal fully depressed3.2 to 4.8
VTA2 (E13 31) E2 (E13 28)BR BRIG switch ON, Accelerator pedal fully released2.1 to 3.1VTA2 (E13±31) ± E2 (E13±28)B±R ± BRIG switch ON, Accelerator pedal fully depressed4.5 to 5.5
VPA (E9 22) EPA (E9 28)GYIG switch ON, Accelerator pedal fully released0.5 to 1.1VPA (E9±22) ± EPA (E9±28)G ± YIG switch ON, Accelerator pedal fully depressed2.5 to 4.6
VPA2 (E9 23) EPA2 (E9 29)WYIG switch ON, Accelerator pedal fully released1.5 to 2.9VPA2 (E9±23) ± EPA2 (E9±29)W ± YIG switch ON, Accelerator pedal fully depressed3.5 to 5.5
VCPA (E9±26) ± EPA (E9±28)B ± YIG switch ON4.5 to 5.5
VCP2 (E9±27) ± EPA2 (E9±29)B ± YIG switch ON4.5 to 5.5
VG (E13±30) ± EVG (E13±29)L±Y ± GIdling, P or N position, A/C switch OFF0.5 to 3.0
THA (E13±20) ± E2 (E13±28)GR ± BRIdling, Intake air temperature 20 C (68 F)0.5 to 3.4
THW (E13±19) ± E2 (E13±28)B±W ± BRIdling, Coolant temperature 80   \b0.2 to 1.0
#1 (E13±1) ± E01 (E13±7)
#2 (E13 2) E01 (E13 7)
G±W ± W±B
WR WBIG switch ON9 to 14#2 (E13±2) ± E01 (E13±7)
#3 (E13±3) ± E01 (E13±7)
#4 (E13±4) ± E01 (E13±7)W±R ± W±B
R±W ± W±B
W±L ± W±B
IdlingPulse generation
(See page 05±415)
IJF1 (E13±25) ± E01 (E13±7)R±B ± W±BIdlingPulse generation
(See page 05±415)
IGT1 (E13±8) ± E1 (E11±1)
IGT2 (E13±9) ± E1 (E11±1)
IGT3 (E13±10) ± E1 (E11±1)
IGT4 (E13±11) ± E1 (E11±1)R±W ± BR P ± BR
LG±B ± BR
L±Y ± BR
IdlingPulse generation
(See page 05±439)
IG switch ON4.5 to 5.5
IGF1 (E13±24) ± E1 (E11±1)W±R ± BRIdlingPulse generation
(See page 05±439)
G2+ (E11±27) ± NE± (E11±24)W ± RIdlingPulse generation
(See page 05±436)
NE+ (E11±25) ± NE± (E11±24)G ± RIdlingPulse generation
(See page 05±433)
FC (E9±10) ± E1 (E11±1)G±Y ± BRIG switch ON9 to 14
M+ (E11±3) ± E01 (E13±7)
M± (E11±2) ± E01 (E13±7)B ± W±B
W ± W±BIdlingPulse generation

05±394
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0171 SYSTEM TOO LEAN (BANK 1)
DTC P0172 SYSTEM TOO RICH (BANK 1)
DTC P0174 SYSTEM TOO LEAN (BANK 2)
DTC P0175 SYSTEM TOO RICH (BANK 2)
CIRCUIT DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic 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 stoichio-
metric air±fuel ratio. The signal from the heated oxygen sensor indicates whether the air±fuel ratio is RICH
or LEAN compared to the stoichiometric air±fuel ratio. This variance triggers 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 carried out in long±term to compensate for a continu-
al deviation of the short±term fuel trim from the central value, due to individual engine differences, wear over-
time and changes in the operating environment.
If both the short±term fuel trim and the long±term fuel trim are LEAN or RICH beyond a certain value, it is
detected as a malfunction and the CHK ENG is illuminated.
DTC No.DTC Detection ConditionTrouble Area
P0171
P0174When 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

Manifold absolute pressure sensor

Engine coolant temperature sensor

Fuel pressure

Gas leakage in exhaust system

Open or short in heated oxygen sensor (bank 1, 2 sensor 1)
circuit

Heated oxygen sensor (bank 1, 2 sensor 1)

Heated oxygen sensor heater (bank 1, 2 sensor 1)

EFI relay

PCV valve and hose

PCV hose connection

ECM
P0172
P0175When 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 blockage

Mass air flow meter

Manifold absolute pressure sensor

Engine coolant temperature sensor

Ignition system

Fuel pressure

Gas leakage in exhaust system

Open or short in heated oxygen sensor (bank 1, 2 sensor 1)
circuit

Heated oxygen sensor (bank 1, 2 sensor 1)

ECM
HINT:

When DTC ºP0171 or P0174º is recorded, the actual air±fuel ratio is on the LEAN side. When DTC
ºP0172 or P0175º is recorded, the actual air±fuel ratio is on the RICH side.

If the vehicle runs out of fuel, the air±fuel ratio is LEAN and DTC ºP0171 or P0174º is recorded. The
CHK ENG then comes on.
05CKD±01




3020
10
5
3
02040
0.1 1
0.3 0.2
0.5 2
6080100
±20
(±4)(104)(140)(176) (32)(68)(212)


30
20
10
5
3
02040
0.1 1
0.3 0.2
0.5 2
6080100
±20
(±4)(104)(140)(176) (32)(68)(212)
A81700
Ohmmeter
Acceptable
TEMPERATURE
C (
F)
RESISTANCE K 
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±399
AVENSIS REPAIR MANUAL (RM1018E)
5INSPECT ENGINE COOLANT TEMPERATURE SENSOR(RESISTANCE)
(a)Remove the engine coolant temperature sensor.
(b)Measure the resistance between the terminals.
Resistance:
2.32 to 2.59 k at 20
C (68
F)
0.310 to 0.326 k at 80
C (176
F)
NOTICE:
In case of checking the engine coolant temperature sensor
in the water, be careful not to allow water to go into the ter-
minals. After checking, dry the sensor.
HINT:
Alternate procedure: Connect an ohmmeter to the installed en-
gine coolant temperature sensor and read the resistance. Use
an infrared thermometer to measure the engine temperature in
the immediate vicinity of the sensor. Compare these values to
the resistance/temperature graph. Change the engine temper-
ature (warm up or allow to cool down) and repeat the test.
NGREPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK
6CHECK FOR SPARK AND IGNITION (See page 18±12)
NG REPAIR OR REPLACE
OK
7CHECK FUEL PRESSURE(LOW PRESSURE) (See page 11±33)
NG CHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND
FILTER
OK
8CHECK FUEL PRESSURE(HIGH PRESSURE) (See page 11±33)
NG CHECK AND REPLACE FUEL PUMP, FUEL PRESSURE SENSOR, WIRING AND FUEL
LEAKAGE
OK