2005 TOYOTA AVENSIS fuel pressure

−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −329
AVENSIS Supplement (RM 1045E)
TYPICAL ENABLING CONDITIONS
ItemSpecificationItemMinimumMaximum
Engine speed600 rpm−
The monitor will not run if the fuel pressure sensor, suction control valve circuit, or pressure discharge valve is malfunctioning
TYPICAL MALFUNCTION THRESHOLDS
Threshold
Drop of the internal fuel pressure is large when injecting fuel
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand−held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, 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.
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO DTC P0093)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Select the item ”DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES”.
(d) Read DTCs. Result:
Display (DTC output )Proceed to
P0093A
P0093 and P 1238B
P0093 and P0200 and/or P 127 1C
HINT:
If any other codes besides P0093 are output, perform troubleshooting for those DTCs first.
B Go to step 3
C GO TO RELEVANT DTC CHART(See page 05 −299)
A
2 CHECK FUEL LEAKAGE(IN HIGH −PRESSURIZED FUEL PARTS AND AREA)
(a) Visually check the supply pump, injector and fuel line located between the supply pump and common
rail for fuel leaks or fuel pressure leaks. Also, perform the same on the fuel line between the common
rail and the injector (see page 11− 67, 11− 46).
HINT:
There is possibility that fuel leaks inside the components (supply pump, etc) have been occurred.
NG REPAIR OR REPLACE
OK

05−330
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
3 READ VALUE OF HAND −HELD TESTER(COMPENSATION OF INJECTION
VOLUME FOR EACH CYLINDER)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Start the engine.
(d) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / INJ VOLUME FB” and read its value displayed on the hand −held tester.
Result:
ResultCompensatory Injection Volume (mm 3)
Standard− 3to3
Maximum−4.9 to 4.9
NG REPLACE INJECTOR ASSY (See page 11− 46)
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 to ON and turn the hand −held tester ON.
(d) Select the item ”DIAGNOSIS / OBD/MOBD / ACTIVE TEST / FUEL LEAK TEST”.
(e) Check for fuel leaks in the high −pressurized area.
GO
CHECK IF DTC OUTPUT RECURS (DTC P0093)
HINT:
SAfter clearing the DTC, let the engine idle for 1minute and then run it at 2,500 rpm for 30 seconds.
SAt the same time, check the fuel pressure inside the common rail in the ”DIAGNOSIS / OBD/MOBD
/ DATA LIST / ALL / COMN RAIL” using the hand −held tester.
SThe internal fuel pressure of the common rail must be stable under each driving condition.
Reference:
Engine SpeedFuel Pressure (MPa)
IdlingApproximately 30 to 40
2,500 rpm (No engine load)Approximately 50 to 100

−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −32 1
AVENSIS Supplement (RM 1045E)
DTC P0088 FUEL RAIL/SYSTEM PRESSURE − TO O
HIGH
DTC P 1229 FUEL PUMP SYSTEM
HINT:
S For more information on the supply pump (suction control valve) and the common rail system,
see page 05 −255.
S If P0088 and/or P 1229 is present, refer to the diagnostic trouble codes (DTCs) table for the fuel system
on page 05 −255.
CIRCUIT DESCRIPTION
Refer to the description on page 05 −255.
DTC No.DTC Detection ConditionTrouble Area
P0088
SInternal fuel pressure of the common rail is too high:
The fuel pressure exceeds 200 MPa (2,039 kgf/cm2, 29,007
psi)
( 1 trip detection logic)
SSupply pump (Suction control valve)
S Pressure discharge valve
S Short in supply pump (Suction control valve) circuit
S Open in pressure discharge valve circuit
S ECM
P 1229
SFuel over −feed:
Internal fuel pressure is beyond the target fuel pressure de-
spite the ECM closing the suction control valve
( 1 trip detection logic)SShort in supply pump (Suction control valve) circuit
S Supply pump (Suction control valve)
S ECM
HINT:
After confirming DTC P0088 and P 1229, check the fuel rail pressure in the ”DIAGNOSIS / OBD/MOBD /
DATA LIST / ALL / COMN RAIL” using the hand −held tester.
Reference:
Engine SpeedFuel Pressure (MPa)
IdlingApproximately 30 to 40
2,500 rpm (No engine load)Approximately 50 to 100
MONITOR DESCRIPTION
P0088 (Internal fuel pressure too high):
The ECM will set this DTC if the fuel pressure inside the common rail is beyond 200 MPa (2,039 kgf/cm
2,
29,007 psi). This DTC indicates that the suction control valve may be stuck open, or there may be short in
its circuit, and the pressure discharge valve may be stuck closed, or there may be open in its circuit.
If this DTC is present, the ECM enters the fail −safe mode and limits the engine power. The fail −safe mode
continues until the ignition switch is turned to OFF.
P 1229 (Fuel over −feed):
The ECM will set this DTC if the actual fuel pressure inside the common rail stays higher than the target fuel
pressure, despite the ECM closing the suction control valve. This DTC represents that the suction control
valve may be stuck open, or there may be short in its circuit. Under this condition, the pressure discharge
valve operates frequently.
If this DTC is present, the ECM enters the fail −safe mode and limits the engine power. The fail −safe mode
continues until the ignition switch is turned to OFF.
05CPE −03

05−322
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
MONITOR STRATEGY
P0088:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration1second
CHK ENG operation1driving cycle
P1229:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration1minute
CHK ENG operation1driving cycle
TYPICAL ENABLING CONDITIONS
P0088:
Specification
The monitor will not run if the fuel pressure sensor, or suction control valve circuit, or pressure discharge valve is malfunctioning
P1229:
ItemSpecification
Target fuel pressure variationSmall
The monitor will not run if the fuel pressure sensor, or suction control valve circuit, or pressure discharge valve is malfunctioning
TYPICAL MALFUNCTION THRESHOLDS
P0088:
Detection CriteriaThreshold
Fuel pressure sensor200 MPa (2,039 kgf/cm2, 29,007 psi) or more
P1229:
ItemThreshold
The internal fuel pressure of the common rail with the suction control valve
closedStays at higher than targeted fuel pressure
Behavior of the pressure discharge valveFrequently operates

A82347
S6
Suction Control Valve
E13 2
PCV+
21
LG LG−R
PCV−
E13 1
EDU
1PRDECM
E13 32
1
EA1 PRDR−L
E54
W
PRVE58
B
COM3
E472 P3
Pressure Discharge Valve
W
B 2
EA1
(Shielded) (Shielded)
BR
BR
BR
EIJ12 D
J12 E
J13 D J13 E J/C
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−323
AVENSIS Supplement (RM1045E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data usingthe hand−held tester.Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, 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.

05−314
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
DTC P0087 FUEL RAIL/SYSTEM PRESSURE − TO O
LOW
DTC P0 190 FUEL RAIL PRESSURE SENSOR CIRCUIT
DTC P0 192 FUEL RAIL PRESSURE SENSOR CIRCUIT
LOW INPUT
DTC P0 193 FUEL RAIL PRESSURE SENSOR CIRCUIT
HIGH INPUT
HINT:
S For more information on the fuel pressure sensor and the common rail system, see page 05 −255.
SIf P0087, P0 190, P0 192 and/or P0 193 is present, refer to the diagnostic trouble codes (DTCs) table
for fuel system on page 05 −255.
05CPD −05

A91222
Fuel Pressure (MPa)
Output Voltage (V)
0.55
0
190 3.894.44
PR2 (Sub) PR (Main)
E2SPR2 VC
PR
E2
VCS Main
Sub
4.90
Detect P0193
Detect P0192
0.85 1.40 Property of Output Voltage:Internal Structure of the Pressure Sensor
(Duplicates System):
5.00
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−315
AVENSIS Supplement (RM1045E)
CIRCUIT DESCRIPTION
The ECM monitors internal fuel pressure of the common rail using the fuel pressure sensor and controls the
suction control valve to regulate the internal fuel pressure to the target pressure, approximately 30 to180
MPa (306 to1,835 kgf/cm
2, 4,351to 26,106 psi).
The pressure sensor is a semiconductor pressure sensor that varies electric resistance when applying pres-
sure to its silicon. This sensor output voltage changes 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 of the sensor circuit is failed, the other normal circuit will be used to monitor the internal fuel pressure.
DTC No.DTC Detection ConditionTrouble Area
P0087Fuel pressure sensor output voltage stays at fixed value
(1trip detection logic)
P0190
Fuel pressure sensor output voltage is 0.55 V or less, or 4.9 V
or more for 0.5 second
(1trip detection logic)
SOpen or short infuelpressure sensor circuit
P0192
Fuel pressure sensor output voltage is 0.55 V or less for 0.5
second
(1trip detection logic)
SOpenorshortinfuelpressuresensorcircuit
SFuel pressure sensor
SECM
P0193
Fuel pressure sensor output voltage is 4.9 V or more for 0.5
second
(1trip detection logic)

A82882
Fuel Pressure
Engine Speed
Normal
Abnormal P0087 Malfunction Detection: 05−316
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
HINT:
After confirming DTC P0087, P0190, P0192 and P0193, check the internal fuel pressure of the common rail
in ”DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COMN RAIL” using the hand−held tester.
Reference:
Engine SpeedFuel Pressure (MPa)
IdlingApproximately 30 to 40
Running the engine at 2,500 rpm (No engine load)Approximately 50 to100
MONITOR DESCRIPTION
P0087 (Fuel pressure sensor output stays at fixed value):
Under normal condition, an internal fuel pressure of the common rail usually fluctuates1to 2 MPa (10to
20 kgf/cm
2,145 to 290 psi) even if the driving condition is constant. The internal fuel pressure is approximate-
ly 30 to 40 MPa (306 to 408 kgf/cm
2, 4,351to 5,801psi) at idling, and it increases to approximately 50 to
100 MPa (510to1,020 kgf/cm
2, 7,251to14,503 psi) when running the engine at 2,500 rpm. This DTC is
set if there is no fluctuation in the internal fuel pressure.
If this DTC is present, the ECM enters the fail−safe mode and limits the engine power. The fail−safe mode
continues until the ignition switch is turned to 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 the fail−safe mode and limits the engine power. The fail−safe
mode continues until the ignition switch is turned to OFF.