2005 TOYOTA AVENSIS fuel pressure

+25 %
±12.5 %
More than 0.55 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)Mainly suspect
trouble area
OK
+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
+25 %
±12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
Sensor 1: front sensor
(sensor 1, heater, sensor 1
circuit)
+25 %
±12.5 %
More than 0.55 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
No reaction
No reaction
No reaction No reaction


Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
05±375
AVENSIS REPAIR MANUAL (RM1018E)
The following A/F CONTROL procedure enables the technician to check and graph the voltage outputs of
both the heated oxygen sensors.
For displaying the graph indication, enter ºACTIVE TEST / A/F CONTROL / USER DATAº, then select ºO2S
B1S1 and O2S B1S2º or ºO2S B2S1 and O2S B2S2º by pressing ºYESº button and push ºENTERº button
before pressing ºF4º button.
NOTICE:
If the vehicle is short of fuel, the air±fuel ratio becomes LEAN and DTCs P0133 and/or P0153 will be
recorded, and the CHK ENG then comes on.
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.

A high heated oxygen sensor (sensor 1) voltage (0.55 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.

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±379
AVENSIS REPAIR MANUAL (RM1018E)
8CHECK AIR INDUCTION SYSTEM
(a)Check for vacuum leaks in the air induction system.
NGREPAIR OR REPLACE AIR INDUCTION SYSTEM
OK
9CHECK FUEL PRESSURE(LOW PRESSURE) (See page 11±33)
NGCHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND
FILTER
OK
10CHECK FUEL PRESSURE(HIGH PRESSURE) (See page 11±33)
NGCHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND
FILTER
OK
11CONFIRM IF ANY MISFIRING DTCS WERE PRESENT AT STEP 1
(a)Misfiring DTC ºP0301, P0302, P0303 and/or P0304º was present at step 1. NOREPLACE HEATED OXYGEN SENSOR
YES
12REPLACE FUEL INJECTOR ASSY (See page 11±42)
HINT:
If one or more the misfiring DTCs ºP0301, P0302, P0303 and/or P0304º\
were present at step 1, replace the
injector(s) mounted on the misfiring cylinder(s) that is referred by the DTC(s)\
with normal injector(s). GO
13PERFORM CONFIRMATION DRIVING PATTERN (See page 05±363)
HINT:
Clear all DTCs prior to performing the confirmation driving pattern.GO

05±420
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0300 RANDOM/MULTIPLE CYLINDER MISFIRE
DETECTED
DTC P0301 CYLINDER 1 MISFIRE DETECTED
DTC P0302 CYLINDER 2 MISFIRE DETECTED
DTC P0303 CYLINDER 3 MISFIRE DETECTED
DTC P0304 CYLINDER 4 MISFIRE DETECTED
CIRCUIT DESCRIPTION
Misfire: The ECM uses the crankshaft position sensor and camshaft position sensor to monitor changes in
the crankshaft rotation for each cylinder.
The ECM counts the number of times the engine speed change rate indicates that misfire has occurred. And
when the misfire rate equals to or exceeds the count of indicating that the engine condition has deteriorated,
the CHK ENG is illuminated.
If the misfire rate is high enough and the driving conditions will cause the catalyst to overheat, the CHK ENG
blinks when misfiring occurs.
HINT:

For any particular 200 revolutions of the engine, misfiring which would result in overheating of catalyst
is detected. This cause CHK ENG to blink (1 trip detection logic).

For any particular 1,000 revolutions of engine, misfiring which would result in a deterioration of emis-
sions. This illuminates CHK ENG (2 trip detection logic).
DTC No.DTC Detection ConditionTrouble Area
P0300Misfiring of random cylinders is detected

Open or short in engine wire

Connector connection

Vacuum hose connection

Ignition system

Injector
P0301
P0302
Misfiring of each cylinder is detected

Fuel pressure

Mass air flow meter

Engine coolant temperature sensor

Compression pressure


Valve clearanceP0302
P0303
P0304Misfiring of each cylinder is detected
Valve clearance

Valve timing

PCV hose connection

PCV hose

ECM
HINT:
When codes for a misfiring cylinder are recorded repeatedly but no random misfire code is recorded, it indi-
cates that the misfires have been detected and recorded at different times.
05CKH±01

05±424
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
8REPLACE FUEL INJECTOR OF MISFIRING CYLINDER
(a)Read the DTC and check which of the cylinders causes the misfiring DTC (See page 05±294).
(b)Remove the injector of the misfiring cylinder and other normal injector \
(See page 11±42).
(c)Swap the injector of misfiring cylinder for the normal injector. GO
9PERFORM CONFIRMATION DRIVING PATTERN
HINT:
Clear all DTCs prior to performing the confirmation driving pattern.GO
10READ OUTPUT DTC(MISFIRE DTCS ARE OUTPUT AGAIN)
(a)Read the DTC using the hand±held tester. Result:
Display (DTC output)Proceed to
The same DTC is output againA
The other DTC is outputB
BREPLACE FUEL INJECTOR ASSY
A
11SWITCH STEP BY NUMBER OF MISFIRE CYLINDER(REFER RESULT OF STEP 4)

If the result of step 4 is º1 or 2 cylindersº, proceed to A.

If the result of step 4 is ºmore than 3 cylindersº, proceed to B. BCHECK FOR INTERMITTENT PROBLEMS
A
12CHECK VALVE TIMING(CHECK FOR LOOSE AND JUMPING TEETH)
NGADJUST VALVE TIMING
OK
13CHECK FUEL PRESSURE(LOW PRESSURE) (See page 11±33)
NG CHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND
FILTER
OK

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±425
AVENSIS REPAIR MANUAL (RM1018E)
14CHECK FUEL PRESSURE(HIGH PRESSURE) (See page 11±33)
NG CHECK AND REPLACE FUEL PUMP, FUEL
PRESSURE SENSOR, WIRING AND FUEL
LEAKAGE
OK
15 READ VALUE OF HAND±HELD TESTER(INTAKE AIR TEMPERATURE AND MASS AIR FLOW RATE)
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Check the intake air temperature.
(1) Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / INTAKE AIRº and read its valuedisplayed on the hand±held tester.
Temperature: Equivalent to ambient temperature
(d) Check the air flow rate. (1) Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / MAFº and read its value displayedon the hand±held tester.
Standard:
ConditionAir flow rate (gm/s)
Ignition switch ON (do not start engine)0
Idling4 to 6
Running without load (2,500 rpm)13 to 20
Idling ± RunningAir flow rate fluctuates
NG REPLACE MASS AIR FLOW METER
OK

±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±563
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0088FUEL RAIL/SYSTEM PRESSURE ± TOO
HIGH
DTCP1229FUEL PUMP SYSTEM
HINT:

For more information on the supply pump (suction control valve) and the c\
ommon rail system,
see page 05±517.

If P0088 and/or P1229 are present, use the diagnostic trouble code matri\
x for fuel system,
see page 05±517.
CIRCUIT DESCRIPTION
Refer to description on page 05±517.
DTC No.DTC Detection ConditionTrouble Area
P0088
Internal fuel pressure of the common rail is too high.
The fuel pressure exceeds 200 MPa (2,039 kgf/cm2, 29,007
psi).

Supply pump (Suction control valve)

Pressure discharge valve

Short in supply pump (Suction control valve) circuit

Open in pressure discharge valve circuit

ECM
P1229
Fuel over fed.
Internal fuel pressure is beyond the target fuel pressure de-
spite the ECM closing the suction control valve.
Short in supply pump (Suction control valve) circuit

Supply pump (Suction control valve)

ECM
HINT:
After confirming DTC ºP0088 and P1229º, use the hand±held tester to \
confirm the fuel rail pressure 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
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 o\
pen, or there may be short in
its circuit, and the pressure discharge valve may be stuck close, or the\
re may be open in its circuit.
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.
P1229 (Fuel over fed):
The ECM will set this DTC if the actual fuel pressure inside the common rai\
l stays higher than the target fuel
pressure, despite the ECM closing the suction control valve. This DTC co\
de represents that the suction con-
trol valve may be stuck open, or there may be short in its circuit. Unde\
r this condition, the pressure discharge
valve will operate quite often.
If this DTC is present, the ECM enters fail±safe mode and limits the en\
gine power. The fail±safe mode will
continue until the ignition switch is turned OFF.
05CPE±01

05±564
± DIAGNOSTICSECD SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
MONITOR STRATEGY
P0088:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration1 sec.
CHK ENG operation1 driving cycle
P1229:
Required sensorsFuel pressure sensor
Frequency of operationContinuous
Duration1 min.
CHK ENG operation1 driving 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 variation is small±
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:
Threshold
Internal fuel pressure of the common rail stays higher than the target fuel pressure, despite the ECM closing the suction control valve, and also
the pressure discharge valve is frequently operating

A75346
Suction
Control
Valve
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±567
AVENSIS REPAIR MANUAL (RM1018E)
3READ VALUE OF HAND±HELD TESTER(FUEL PRESSURE)
(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 / COMN RAIL PRESSº and read its value
displayed on the hand±held tester.
(e)Check that the internal fuel pressure of the common rail drops below approxim\
ately 5 MPa within approximately 1 second as the ignition switch is turned OFF at the engine in an idle.\
Result:
Pressure Displayed (MPa)Proceed to
Approx. 5 or lessA
Approx. 5 or moreB
BREPLACE COMMON RAIL ASSY (PRESSURE DISCHARGE VALVE) (See page 14±286)
PROCEED TO STEP 4 AFTER REPLACEMENT
A
4 CHECK INJECTION OR SUPPLY PUMP ASSY(SUCTION CONTROL VALVE)
(a) Check the suction control valve for resistance. (1) Measure the resistance between the terminals.
Resistance: 1.9 to 2.3
at 20
C (68
F)
NG REPLACE INJECTION OR SUPPLY PUMP ASSY (SUCTION CONTROL VALVE)
(See page 11±69)
OK