2005 TOYOTA AVENSIS fuel

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.

− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−317
AVENSIS Supplement (RM1045E)
MONITOR STRATEGY
P0087:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration1second
CHK ENG operation1driving cycle
P0190:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 second
CHK ENG operation1driving cycle
P0192:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 second
CHK ENG operation1driving cycle
P0193:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 second
CHK ENG operation1driving cycle
TYPICAL ENABLING CONDITIONS
P0087:
ItemSpecificationItemMinimumMaximum
Engine speed500 rpm−
Battery voltage8V−
Fuel volume5mm3−
The monitor will not run if the fuel pressure sensor circuit (P0190, P0192 and P0193) is malfunctioning
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

A80998
F16
Fuel Pressure Sensor
5
P
PCR1 ECM
E13 26 5
EB1
2
P−B
PCR2
E13 33 2
EB1
1
R−W
VCS
E12 2 1
EB1
6
R−W
VC
E13 18 6
EB1
3
BR
E2S
E12 1 3
EB1
4
BR
E2
E13 28 4
EB1 PR
PR2P
P−B
R−W
R−W
BR
BR VC
E2S VCS
E2
05−318
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
SAfter completing repairs, check that P0087 is not present again.
SIf different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may have an open circuit.
SRead 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.
1READ VALUE OF HAND−HELD TESTER(FUEL PRESSURE)
(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 / COMN RAIL”.
(e) Check that internal fuel pressure of the common rail is within the specification below.
Reference:
Engine SpeedFuel Pressure (MPa)
IdlingApproximately 30 to 40
2,500 rpm (No engine load)Approximately 50 to100
NG Go to step 3
OK

A80452
PCR1E
13
ECM Connector
E
12PCR2
E2VCS
E2S
VC
A84808
E2
F
16
Wire Harness Side:
Front View
VCS
PRE2S
VC
Fuel Pressure Sensor Connector
PR2
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −319
AVENSIS Supplement (RM 1045E)
2 CHECK IF DTCS OUTPUT RECUR(FUEL PRESSURE SENSOR DTCS)
(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 / CLEAR CODES”.
(d) Clear the DTCs.
(e) Let the engine idle for 60 seconds, and repeat quick engine RPM acceleration (to 2,500 rpm) for 30 seconds.
(f) Select the item ”DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES”.
(g) Read DTCs.
Result:
Display (DTC output)Proceed to
P0087, P0 190, P0 192 and/or P0 193A
No outputB
B CHECK FOR INTERMITTENT PROBLEMS
(See page 05 −270)
A
REPLACE ECM (See page 10− 29)
3 CHECK HARNESS AND CONNECTOR(FUEL PRESSURE SENSOR − ECM)
(a) Disconnect the E 12 and E 13 ECM connectors.
(b) Disconnect the F 16 fuel pressure sensor connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
PCR1(E 13− 26) −PR (F 16− 5)
PCR2 (E 13− 33) −PR2 (F 16− 2)
VCS (E 12− 2) −VCS (F 16−1 )Below1
VC (E 13−1 8)−VC (F 16− 6)Below 1

E2 (E 13− 28) −E2 (F 16− 4)
E2S (E 12−1 )− E2S (F 16− 3)
Standard (Check for short):
Tester ConnectionSpecified Condition
PCR 1(E 13− 26) or PR (F 16− 5) −Body ground
PCR2 (E 13− 33) or PR2 (F 16 − 2) −Body ground
VCS (E 12− 2) or VCS (F 16−1 )− Body ground10k
orhigherVC (E 13−1 8) or VC (F 16− 6) −Body ground10k
or higher
E2 (E 13− 28) or E2 (F 16− 4) −Body ground
E2S (E 12−1 ) or E2S (F 16− 3) −Body ground
(d) Reconnect the ECM connectors.
(e) Reconnect the fuel pressure sensor connector.

05−320
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
AVENSIS Supplement (RM 1045E)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE COMMON RAIL ASSY (FUEL PRESSURE SENSOR) (See page 11− 67)

A91218
ECM Monitor ed
A/F Sens or Voltage
Air−Fuel Ratio
Solid Electrolyte
(Zirconia Element)
Cover Atmosphere
Exhaust Gas Flange
Platinum Electrode
Coating (Ceramic)
Heater
−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
05 −305
AVENSIS Supplement (RM1045E)
DTC P003 1 OXYGEN (A/F) SENSOR HEATER CONTROL
CIRCUIT LOW (BANK 1 SENSOR 1)
HINT:
S For more information on the A/F sensor and TOYOTA D −CAT (*1), see page 05 −255.
S If P0031 is present, refer to the diagnostic trouble codes (DTCs) table for the TOYOTA D −CAT on page
05 −255.
SThis DTC is related to the A/F sensor, although the caption is the oxygen sensor.
*1: Diesel Clean Advanced Technology.
CIRCUIT DESCRIPTION
The A/F sensor has the characteristic that it provides output voltage which is proportional to the existing air −
fuel ratio. The A/F sensor output voltage (*2) is used to provide the ECM with feedback to control the air −fuel
ratio.
The A/F sensor is located after the DPNR (*3) catalytic converter. This sensor has been developed based
on structure and technology of a sensor that is being used for gasoline engines. Its cover portion of the sen-
sor has been changed for application of use to the diesel engine with TOYOTA D −CAT in order to eliminate
influence of the sensor temperature and particulate matter (PM).
In order to reduce both PM and nitrogen oxides (NOx), the ECM adjusts the air −fuel ratio to slightly RICH
(but it is LEAN compared with a stoichiometric air −fuel ratio) with signals from the A/F sensor, if needed.
When the ECM exercises DPNR catalyst regeneration by adding fuel using the exhaust fuel addition injector,
the air −fuel ratio is also properly adjusted through the sensor.
*2: The voltage value changes inside the ECM only.
*3: Diesel Particulate −NOx Reduction system.
05I7J −01