2005 TOYOTA AVENSIS Circuit

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±485
AVENSIS REPAIR MANUAL (RM1018E)
DTCP2111THROTTLE ACTUATOR CONTROL SYSTEM
± STUCK OPEN
DTCP2112THROTTLE ACTUATOR CONTROL SYSTEM ± STUCK CLOSED
CIRCUIT DESCRIPTION
The throttle motor is operated by the ECM and it opens and closes the throttle valve using gears. The open-
ing angle of the throttle valve is detected by the throttle position sensor\
which is mounted on the throttle body.
And, it provides feedback to the ECM to control the throttle motor in order \
to make the throttle valve opening
angle properly in response to the driving condition. If this malfunction is d\
etected, the ECM shuts down the
power for the throttle motor, and the throttle valve is closed by the return spring. And the throttl\
e valve is
locked at a certain opening angle. Also, the whole electronically controlled t\
hrottle operation is cancelled until
the system returns to normal and the ignition switch is turned OFF.
HINT:
This electrical throttle system is no used throttle cable.
DTC No.DTC Detection ConditionTrouble Area
P2111The throttle motor locked during control by the ECM (Stuck
open)
Throttle control motor circuit

Throttle control motor
P2112The throttle motor locked during control by the ECM (Stuck
closed)
Throttle control motor

Throttle body

Throttle valve
WIRING DIAGRAM
Refer to DTC P2102 on page 05±483.
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.
1 INSPECT THROTTLE BODY ASSY(VISUALLY CHECK THROTTLE VALVE)
(a) Check it a foreign object has been caught between the throttle valve and the \
housing.
NG REMOVE FOREIGN OBJECT AND CLEANTHROTTLE BODY
OK
05CKQ±01

A82236
VCP1VCP2
EP2
EP1
LHD Accelerator Pedal Assy
321
6 54
RHD
Accelerator Pedal Assy
321
65 4
VCP2EP2
EP1
VCP1
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±499
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 seconds:
(a) Difference between VPA and VPA2 exceeds the threshold
(b) IDL is OFF
Open or short in 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.
1 INSPECT 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
at 20 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
at 20 C (68 F)EP2 (3) ± VCP2 (6)2.25 to 4.75 k
at 20 C (68 F)
NG REPLACE ACCELERATOR PEDAL ASSY
OK
05CKU±01

05±436
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0340 CAMSHAFT POSITION SENSOR ºAº
CIRCUIT (BANK 1 OR SINGLE SENSOR)
DTC P0341 CAMSHAFT POSITION SENSOR ºAº
CIRCUIT RANGE/PERFORMANCE (BANK 1
SINGLE SENSOR)
CIRCUIT DESCRIPTION
The camshaft position sensor (G2 signal) consists of a magnet, iron core and pickup coil.
The G2 signal rotor has 3 teeth on the outside and is mounted on the intake camshaft.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil changes,
causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The NE signal plate (crankshaft position sensor plate No. 1) has 34 teeth and is installed on the crankshaft.
The NE signal sensor generates 34 signals at every engine revolution. The ECM detects the crankshaft
angle and the engine revolution based on the NE signal, and the cylinder and the angle of the VVT based
on the combination of the G2 and NE signal.
DTC No.DTC Detection ConditionTrouble Area
No camshaft position sensor (G2) signal to ECM during crank-
ing for 4 sec. or more (2 trip detection logic).
O h t i h ft iti i itP0340No camshaft position sensor (G2) signal to ECM with engine
speed 600 rpm or more for 5 sec. or more
(1 trip detection logic).
Open or short in camshaft position sensor circuit

Camshaft position sensor

Camshaft timing gear

Timing chain has jumped a tooth
P0341
While crankshaft rotates twice, camshaft position sensor (G2)
signal will be input to ECM 12 times or more
(1 trip detection logic).
Timing chain has jumped a tooth

ECM
HINT:

DTC P0340 indicate a malfunction related to the camshaft position sensor (+) circuit.
(Wire harness (ECM ± camshaft position sensor) and camshaft position sensor)

DTC P0341 indicate a malfunction related to the camshaft position sensor (±) circuit.
(Wire harness (ECM ± camshaft position sensor) and camshaft position sensor)
05CKK±01

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

±
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

±
DIAGNOSTICS ECD SYSTEM(1CD±FTV)
05±583
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0101MASS OR VOLUME AIR FLOW CIRCUIT
RANGE/PERFORMANCE PROBLEM
CIRCUIT DESCRIPTION
Refer to DTC P0100 on page 05±577.
DTC No.DTC Detection ConditionTrouble Area
After engine is warmed up, condition (a)continues for more
than 10 sec. at idling: (2 trip detection logic)
(a)Mass air flow meter output greater than 2.2 V
P0101Conditions (a) and (b) continue for more than 6 sec. with en-
gine speed 2000 rpm or more: (2 trip detection logic)
(a)VTA greater than 0.1 V
(b)Mass air flow meter output less than 0.25 V
Mass air flow meter
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 P0101)
(a)Read the DTC using the hand±held tester. Result:
Display (DTC output)Proceed to
P0101 and other DTCs are outputA
Only P0101 is outputB
HINT:
If any other codes besides P0101 are output, perform the troubleshoot for \
those DTCs first.
BREPLACE MASS AIR FLOW METER
A
GO TO RELEVANT DTC CHART (See page 05±544)
05CPI±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