2005 TOYOTA AVENSIS fuel

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±513
AVENSIS REPAIR MANUAL (RM1018E)
STARTER SIGNAL CIRCUIT
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery voltage is ap-
plied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection volume for
the starting injection control and after±start injection control.
WIRING DIAGRAM
Refer to DTC P0617 on page 05±471.
INSPECTION PROCEDURE
HINT:
This diagnostic troubleshooting procedure is on the premise that the engine \
is being cranked under normal
conditions. If the engine does not crank, proceed to the problem symptoms table on page 05±320.
1 READ VALUE OF HAND±HELD TESTER(STARTER SIGNAL)
(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 / DATA LIST / ALL / STARTER SIGº and read its value dis-
played on the hand±held tester.
Result:
Ignition Switch PositionONSTART
STA SignalOFFON
OK PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
(See page 05±320)
NG
05CJC±01

A82236
VCP1VCP2
EP2
EP1
LHD Accelerator Pedal Assy
321
6 54
RHD
Accelerator Pedal Assy
321
65 4
VCP2EP2
EP1
VCP1
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±681
AVENSIS REPAIR MANUAL (RM1018E)
DTCP2121THROTTLE/PEDAL POSITION
SENSOR/SWITCH ºDº CIRCUIT
RANGE/PERFORMANCE
CIRCUIT DESCRIPTION
Refer to DTC P2120 on page 05±492.
DTC No.DTC Detection ConditionTrouble Area
P2121
Conditions (a) and (B) continue for 0.5 sec.:
(a)Difference between VPA and VPA2 exceeds the threshold
(b)IDL is OFF
Accelerator pedal position sensor circuit

Accelerator pedal position sensor

ECM
WIRING DIAGRAM
Refer to DTC P2120 on page 05±492.
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, it is useful for determi\
ning whether the vehicle was running
or stopped, the engine was warmed up or not, the air±fuel ratio was lea\
n or rich, etc. at the time of the mal-
function.
1INSPECT ACCELERATOR PEDAL ASSY(ACCELERATOR PEDAL POSITION
SENSOR)
(a)Disconnect the A20 accelerator pedal position sensor
connector.
(b)Measure the resistance between each terminal. Standard (LHD):
Symbols (Terminal No.)Resistance
EP1 (3) ± VCP1 (6)225to475k
at20 C(68 F)EP2 (1) ± VCP2 (4)2.25 to 4.75 k
at 20 C (68 F)
Standard (RHD):
Symbols (Terminal No.)Resistance
EP1 (1) ± VCP1 (4)225to475k
at20 C(68 F)EP2 (3) ± VCP2 (6)2.25 to 4.75 k
at 20 C (68 F)
NGREPLACE ACCELERATOR PEDAL ASSY
(See page 10±66)
OK
05CQ4±01

±
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

A81504
Injector Cross Section DiagramPiston
Solenoid Valve
Nozzle Needle
05±658
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP1238INJECTOR MALFUNCTION
HINT:

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

If P1238 is present, use the diagnostic trouble code matrix for fuel sys\
tem, see page 05±517.
CIRCUIT DESCRIPTION
The ECM detects combustion deterioration for specific cylinder.
HINT:

The cylinder that has compensation learned value for INJ VOL varies from other cylinders may be mal-
functioning.

If DTC P0093 (Fuel leaks in high±pressure area) is present simultan\
eously, leakage malfunction of the
cylinder probably be occurred.

If DTC P0200 (Open or short in EDU or injector circuit) is present sim\
ultaneously, there probably be
faulty circuit located between the ECM and the injector including the ED\
U.

If only DTC P1238 (Injector malfunction) is present, probably the injector is \
mechanical malfunction
or insufficient compression (valve clearance, etc) has occurred, not an open o\
r short malfunction of
the ECM, EDU and injector circuit.

Solenoid valve of the injector is the same type of the pressure discharg\
e valve.
05CQ0±01

±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±659
AVENSIS REPAIR MANUAL (RM1018E)DTC No.
DTC Detection ConditionMain Trouble AreaRelated Trouble Area
P1238Engine speed variation is large when idling.


Injector

EDU (P0200is set simultaneous-
ly)

Open or short in engine wire
(P0200is set simultaneously)

Connector connection (P0200is
set simultaneously)

Compression pressure

Valve clearance

Valve timing

ECM
HINT:
After confirming DTC P1238, use the hand±held tester to confirm the fuel pressure inside the common rail
in 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
P1238 (Injection malfunction, exclude open or short in injector circuit):
This DTC will be set if the engine speed variations between each cylinder is\
large. The ECM monitors
changes in the crankshaft rotation speed using the crankshaft position sensor f\
or detecting poor combus-
tion. Also, it identifies faulty cylinder using the camshaft position sensor. The fluctuation counter increments
when irregular crankshaft rotation speed variation exceeds the threshold at i\
dling. Therefore, either one of
the cylindershas very poor combustion (Rough idle), the ECM sets this DTC.
MONITOR STRATEGY
Required sensorsCrankshaft position sensor
Frequency of operationContinuous
Duration10 min.
CHK ENG operation2 driving cycles
TYPICAL ENABLING CONDITIONS
ItemSpecificationItemMinimumMaximum
EngineAt idling
Engine speed500 rpm±
Engine coolant temperature20 C (68 F)
TYPICAL MALFUNCTION THRESHOLDS
Threshold
The number of irregular changes in the crankshaft rotation speed
HINT:
The number of irregular changes in the crankshaft rotation speed indicat\
es the insufficient combustion cylin-
der.
WIRING DIAGRAM
Refer to DTC P0200 on page 05±604.

05±598
±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0168FUEL TEMPERATURE TOO HIGH
CIRCUIT DESCRIPTION
Refer to DTC P0180 on page 05±599.
DTC No.DTC Detection ConditionTrouble Area
P0168
When THF greater than 35 \fC (95 \fF) and less than 60 \fC
(140 \fF), and THF
±6.7 \fC (20 \fF), and when starting engine,
conditions (a) and (b) continue (1 trip detection logic):
(a)Vehicle speed is changing (Not stable)
(b)THF change is lower than 3 \fC (5.4 \fF) after the engine was
started.

Fuel temperature sensor
In case that reading value of fuel temp. sensor will not change
more than 1 \fC (1.8 \fF) even after repeating 6 trips (detection
logic) of adjusting speed pattern with THF more than 60 \fC
(140 \fF) after the engine was started.
INSPECTION PROCEDURE
HINT:

If DTCs ºP0180, P0182and P0183º are output simultaneously, fuel temperature sensor circuit may be
open or short. Perform the troubleshooting of DTC ºP0180, P0182 or P0183º\
first.

Read freeze frame data using \b
 . Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for d\
etermining whether the vehicle
was running or stopped, the engine was warmed up or not, etc. at the time o\
f the malfunction.
1CHECK OTHER DTC OUTPUT(BESIDES DTC P0168)
(a)Read the DTC using the hand±held tester. Result:
Display (DTC output)Proceed to
Only P0168 are outputA
P0168 and other DTCs are outputB
HINT:
If any other codes besides ºP0168º are output, perform the troublesh\
ooting for those DTCs first.
BGO TO RELEVANT DTC CHART(See page 05±544)
A
REPLACE FUEL TEMPERATURE SENSOR
05CPO±01