2005 TOYOTA AVENSIS fuel

± 20 0 20 40 60 80 100
(± 4) 32 68 104 140 176 212 30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
A56991
(Fig. 1)
Acceptable
Resistance k

Temp.C (F)
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±573
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0095 INTAKE AIR TEMPERATURE SENSOR 2
CIRCUIT
DTC P0097 INTAKE AIR TEMPERATURE SENSOR 2
CIRCUIT LOW
DTC P0098 INTAKE AIR TEMPERATURE SENSOR 2
CIRCUIT HIGH
CIRCUIT DESCRIPTION
The inlet air temperature sensor is built into the intake air con-
nector and senses the inlet air temperature. A thermistor built
in the sensor changes the resistance value according to the in-
let air temperature. The lower the inlet air temperature, the
greater the thermistor resistance value, and the higher the inlet
air temperature, the lower the thermistor resistance value (See
Fig. 1).
The inlet air temperature sensor is connected to the ECM. The
5 V power source voltage in the ECM is applied to the inlet air
temperature sensor from terminal THIA via a resistor R. That is
the resistor R and the inlet air temperature sensor are con-
nected in series. When the resistance value of the inlet air tem-
perature sensor changes in accordance with changes in the in-
let air temperature, the potential at the terminal THIA also
changes. Based on this signal, the ECM increases the fuel in-
jection volume to improve the driveability with a cold engine.
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0095Step 1
Open or short in diesel turbo
inlet air temp. sensor circuit
for 0.5 sec.
(1 trip detection logic)
P0097Step 4
Short in diesel turbo inlet air
temp. sensor circuit for 0.5
sec. (1 trip detection logic)
Open or short in diesel turbo inlet air temp. sensor circuit

Diesel turbo inlet air temperature sensor

ECM
P0098Step 2
Open in diesel turbo inlet air
temp. sensor circuit for 0.5
sec. (1 trip detection logic)
HINT:
After confirming DTC ºP0095, P0097 or P0098º, use the hand±held tester to confirm the intake air tempera-
ture from the ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / AMBI TEMP SENSº.
Temperature DisplayedMalfunction
±40C (±40Open circuit
140C (284  Short circuit
05CPG±01

05±570
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0093FUEL SYSTEM LEAK DETECTED ± LARGE LEAK
HINT:

For more information on the common rail system, see page 05±517.

If P0093 is present, use the diagnostic trouble code matrix for fuel sys\
tem, see page 05±517.
CIRCUIT DESCRIPTION
Refer to description on page 05±517.
DTC No.DTC Detection ConditionTrouble Area
P0093Fuel leaks in high±pressure area.

Fuel line between supply pump and common rail

Fuel line between common rail and injector

Supply pump

Common rail

Injector (P1238 is set simultaneously)

Pressure discharge valve

Open or short in EDU circuit (P0200 is set simultaneously 

Open or short in injector circuit (P0200 and P1238 are set
simultaneously)

EDU (P0200 is set simultaneously 

ECM
HINT:
After confirming DTC P0093, use the hand±held tester to confirm the fuel rail pressure fro\
m the ºDIAGNOSIS
/ OBD/MOBD / DATA LIST / ALL / COMN RAIL PRESSº.
Engine SpeedFuel Pressure (MPa)
IdlingApprox. 30 to 40
Running the engine at 2,500 rpm (No engine load)Approx. 50 to 100
MONITOR DESCRIPTION
P0093 (Fuel leaks in high±pressure area):
This DTC stands for fuel leaks is existing in high±pressure area in the c\
ommon rail system. The ECM
constantly monitors the internal fuel pressure of the common rail after the engine is started, and the ECM
then will set this DTC if the decreasing rate of the internal fuel press\
ure is large when injecting the fuel.
In the common rail system, high±pressure fuel (approx. 30 to 180 MPa (\
306 to 1,835 kgf/cm
2, 4.351 to
26,106 psi)) is always applied to the high±pressure area including the su\
pply pump, common rail, injector
and piping. The ECM adjusts the suction control valve opening angle to obtain the target internal fuel pres-
sure.
If this DTC is present, the ECM enters fail±safe mode and permits drivi\
ng the vehicle for extra 1 minute before
stopping both the fuel injection and supply pump operation, then stops the engine\
. The fail±safe mode will
continue until the ignition switch is turned OFF.
MONITOR STRATEGY
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration1 sec.
CHK ENG operation1 driving cycle
TYPICAL ENABLING CONDITIONS
ItemSpecificationItemMinimumMaximum
Engine speed600 rpm±
The monitor will not run if the fuel pressure sensor, or suction control valve circuit, or pressure discharge valve is malfu\
nct ioning
05CPF±01

±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±571
AVENSIS REPAIR MANUAL (RM1018E)
TYPICAL MALFUNCTION THRESHOLDS
Threshold
Drop rate in the internal fuel pressure is large when injecting fuel
INSPECTION PROCEDURE
HINT:
Read freeze frame data using \b
 . 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, etc. at the time of the malfu\
nction.
1CHECK OTHER DTC OUTPUT(BESIDES DTC P0093)
(a)Connect the hand±held tester to the DLC3.
(b)Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(c)Select the item ºDIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODESº.\
(d)Read the DTCs.
Result:
Display (DTC output besides DTC P0093)Proceed to
Only DTC P0093 is outputA
DTC P1238 is outputB
DTC ºP0200 and/or P1271º are outputC
HINT:
If any other codes besides ºP0093º are output, perform the troublesh\
ooting for those DTCs first.
BGo to step 3
CGO TO RELEVANT DTC CHART (See page 05±544)
A
2CHECK FUEL LEAKAGE(INSPECT HIGH±PRESSURE FUEL PARTS AND AREA FOR FUEL LEAKS)
(a)Visually check the supply pump, injector and fuel line located between the suppl\
y pump and the com-
mon rail for fuel leaks or fuel pressure leaks. Also, perform the same on t\
he fuel line between the com-
mon rail and the injector (See page 11±69, 11±60).
HINT:
Fuel leaks inside the components (Supply pump, etc) may result.
NG REPAIR OR REPLACE
OK

05±572
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
3READ VALUE OF HAND±HELD TESTER(COMPENSATION OF INJECTION QUANTIFY BETWEEN CYLINDERS)
(a)Connect the hand±held tester to the DLC3.
(b)Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(c)Start the engine.
(d)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / INJ VOLUME FBº and read its value
displayed on the hand±held tester.
Result:
STD ± 3 to 3 mm
3/st
Maximum ± 4.9 to 4.9 mm
3/st
NGREPLACE INJECTOR ASSY (See page 11±60)
OK
4 PERFORM ACTIVE TEST USING HAND±HELD TESTER(FUEL LEAK TEST)
(a) Connect the hand±held tester to the DLC3.
(b) Start the engine.
(c) Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(d) Select the item ºDIAGNOSIS / OBD/MOBD / ACTIVE TEST / FUEL LEAK TESTº\
.
(e) Check for fuel leaks in high±pressure area. GO
CHECK DTC OUTPUT RECUR (DTC P0093 OUTPUT AGAIN)
HINT:

After clearing the DTC, let the engine idle for 1 minute and then run it\
at 2,500 rpm for 30 seconds.

At the same time, use the hand±held tester to confirm the fuel pressure\
inside the common rail from
the ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COMN RAIL PRESSº.
Internal fuel pressure of the common rail must be stable under each driv\
ing condition.
Engine SpeedFuel Pressure (MPa)
IdlingApprox. 30 to 40
Running the engine at 2,500 rpm (No engine load)Approx. 50 to 100

±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±557
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0087FUEL RAIL/SYSTEM PRESSURE ± TOO
LOW
DTCP0190FUEL RAIL PRESSURE SENSOR CIRCUIT
DTCP0192FUEL RAIL PRESSURE SENSOR CIRCUIT LOW INPUT
DTCP0193FUEL RAIL PRESSURE SENSOR CIRCUIT HIGH INPUT
HINT:

For more information on the fuel pressure sensor and the common rail system\
, see page 05±517.

If P0087, P0190, P0192 and/or P0193 are present, use the diagnostic troubl\
e code matrix for fuel sys-
tem, see page 05±517.
05CPD±01

A81476
Fuel Pressure (MPa)
Output Voltage (V)
0.55
0
190 3.89 4.44
PR2 (Sub) PR (Main)
E2SPR2 VC
PR
E2
VCS Main
Sub
4.90
Detect P0193
Detect P0192
0.85 1.40 Property of Output VoltageInternal Structure of the Pressure Sensor
(Duplicate System) 05±558
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
CIRCUIT DESCRIPTION
The ECM monitors internal fuel pressure of common rail using the fuel pressure sensor and controls the suc-
tion control valve to regulate the internal pressure to the target pressure(approx. 30 to 180 MPa (306 to 1,835
kgf/cm
2, 4.351 to 26,106 psi)).
The pressure sensor is a semiconductor pressure sensor that varies electric resistance when applying pres-
sure to its silicon. This sensor outputs voltage in proportion to the internal fuel pressure. The sensor has been
designed as a duplicate circuit, and its main (PR) circuit is used under normal condition. Even if either sensor
is failed, another normal sensor will be used to monitor the internal fuel pressure.
DTC No.DTC Detection ConditionTrouble Area
P0087Fuel pressure sensor output stays at fixed value.
P0190
Condition (a) continues for 0.5 sec.:
(c) Fuel pressure sensor output voltage is º0.55 V or lessº or
º4.9 V or moreº.

Open or short in fuel pressure sensor circuit
Fl
P0192Condition (a) continues for 0.5 sec.:
(a) Fuel pressure sensor output voltage is 0.55 V or less.
Fuel pressure sensor

ECM
P0193Condition (a) continues for 0.5 sec.:
(a) Fuel pressure sensor output voltage is 4.9 V or more.
HINT:
After confirming DTC ºP0087, P0190, P0192 and P0193º, use the hand±held tester to confirm internal the
fuel pressure of the common rail from the ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COMN RAIL
PRESSº.
Engine SpeedFuel Pressure (MPa)
IdlingApprox. 30 to 40
Running the engine at 2,500 rpm (No engine load)Approx. 50 to 100

A82882
Fuel Pressure
Engine Speed
Normal
Abnormal P0087 Malfunction Detection
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
05±559
AVENSIS REPAIR MANUAL (RM1018E)
MONITOR DESCRIPTION
P0087 (Fuel pressure sensor output stays at fixed value):
Under normal condition, internal fuel pressure of the common rail usually fluctuates 1 to 2 MPa (10 to 20
kgf/cm
2, 145 to 290 psi) even if the driving condition is constant. The internal fuel pressure is approximately
30 to 40 MPa (306 to 408 kgf/cm
2, 4,351 to 5,801 psi) at idling, and it increases to approx. 50 to 100 MPa
(510 to 1,020 kgf/cm
2, 7,251 to 14,503 psi) when running the engine at 2,500 rpm. This DTC code is set if
there is no fluctuation at the internal fuel pressure.
If this DTC is present, the ECM enters fail±safe mode and limits the engine power. The fail±safe mode will
continue until the ignition switch is turned OFF.
P0190, P0192 and P0193 (Open or short in fuel pressure sensor circuit):
These DTCs are set if the fuel pressure sensor output voltage is out of the standard range. The DTCs stand
for open or short malfunction of the sensor circuit.
If these DTCs are present, the ECM enters fail±safe mode and limits the engine power. The fail±safe mode
will continue until the ignition switch is turned OFF.
MONITOR STRATEGY
P0087:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration1 sec.
CHK ENG operation1 driving cycle
P0190:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 sec.
CHK ENG operation1 driving cycle
P0192:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 sec.
CHK ENG operation1 driving cycle

05±560
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
P0193:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 sec.
CHK ENG operation1 driving cycle
TYPICAL ENABLING CONDITIONS
P0087:
ItemSpecificationItemMinimumMaximum
Engine speed500 rpm±
Battery voltage8 V±
Fuel quantify5 mm3/st±
The monitor will not run if the fuel pressure sensor circuit (P0190, P0192 and P0193) is malfunction
TYPICAL MALFUNCTION THRESHOLDS
P0087:
Detection CriteriaThreshold
Changing value of fuel pressureVirtually no fluctuation
P0190:
Detection CriteriaThreshold
Fuel pressure sensor output voltageLess than 0.55 V or more than 4.9 V
P0192:
Detection CriteriaThreshold
Fuel pressure sensor output voltageLess than 0.55 V
P0193:
Detection CriteriaThreshold
Fuel pressure sensor output voltageMore than 4.9 V