2005 TOYOTA AVENSIS fuel

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±475
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0724BRAKE SWITCH ºBº CIRCUIT HIGH
CIRCUIT DESCRIPTION
This STP signal is used to detect that the brakes have been applied. The STP\
signal voltage is the same
as the one supplied to the stop lights.
The STP signal is used mainly to control the fuel cut±off engine speed (The fuel cut±off engine speed is re-
duced slightly when the vehicle is braking).
DTC No.DTC Detection ConditionTrouble Area
P0724The stop light switch does not turn off even the vehicle is driv-
en. (2 trip detection logic)
Short in stop light switch signal circuit

Stop light switch

ECM
WIRING DIAGRAM
Refer to DTC P0504 on page 05±455.
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 CHECK OPERATION OF STOP LIGHT
(a) Check if the stop lights go on and off normally when the brake pedal is operated and released.
NG REPAIR OR REPLACE STOP LAMP SWITCHCIRCUIT
OK
2 READ VALUE OF HAND±HELD TESTER(STOP LIGHT SWITCH)
(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 / STOP LIGHT SWº and read its value displayed on the hand±held tester.
Result:
Brake PedalSTP Signal
DepressedON
ReleasedOFF
OK CHECK FOR INTERMITTENT PROBLEMS
NG
05CJ7±01

±
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

A76903
NE+
G2+
NE±ECM Connector E11
A59781
A64984Camshaft Position Sensor
Component Side
C1
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±437
AVENSIS REPAIR MANUAL (RM1018E)
Reference: Inspection using the oscilloscope.
(1)During cranking or idling, check the waveform be-tween the terminals of the ECM connector.
ItemDetails
TerminalCH1: G2+ ± NE±
CH2: NE+ ± NE±
Equipment Setting5 V/Division, 20 ms/Division
ConditionDuring Cranking or idling
HINT:
The correct waveforms are as shown in the left.
WIRING DIAGRAM
Refer to DTC P0335 on page 05±433.
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 CAMSHAFT POSITION SENSOR(RESISTANCE)
(a) Disconnect the C1 camshaft position sensor connector.
(b) Measure the resistance between the terminals of the camshaft position sensor.
Resistance:
835 to 1,400  at cold
1,060 to 1,645 at hot
NOTICE:
ºColdº and ºHotº shown above mean the temperature of
the coils themselves. ºColdº is from ±10
C (14
F) to 50
C
(122
F) and ºHotº is from 50
C (122
F) to 100
C (212
F).
NG REPLACE CAMSHAFT POSITION SENSOR
OK

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±421
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM
Refer to DTC P0200 on page 05±415 for the wiring diagram of the injector system.
Refer to DTC P0351 on page 05±439 for the wiring diagram of the ignition system.
CONFIRMATION DRIVING PATTERN
(a)Connect the hand±held tester to the DLC3.
(b)Record the DTC and freeze frame data.
(c)Use the hand±held tester to set to the check (test) mode (See page 05±294).
(d) Read the value on the misfire counter for each cylinder when idling. If \
the value is displayed on the
misfire counter, skip the following procedure of confirmation driving.
(e) Drive the vehicle several times with the engine speed, load and its surr\
ounding range shown with EN- GINE SPD, CALC LOAD in the freeze frame data or MISFIRE RPM, MISFIRE LOAD in\
the DATA LIST.
If you have no hand±held tester, turn the ignition switch OFF after the symptom is simulated once. Then\
re-
peat the simulation process again.
HINT:
In order to memorize the DTC of misfire, it is necessary to drive around M\
ISFIRE RPM, MISFIRE LOAD for
the following period of time in the DATA LIST. Take care not to turn the ignition switch OFF. Turning the igni-
tion switch OFF switches the diagnosis system from check (test) mode to no\
rmal mode. So all DTCs, etc.,
will be erased.
Engine SpeedTime
Idling3 minutes and 30 seconds or more
1,000 rpm3 minutes or more
2,000 rpm1 minutes and 30 seconds or more
3,000 rpm1 minute or more
(f) Check whether there is misfire or not by monitoring the DTC and the freeze fr\
ame data, and then, re- cord them.
(g) Turn the ignition switch OFF and wait at least for 5 seconds.
INSPECTION PROCEDURE
HINT:

If DTCs besides misfire are memorized simultaneously, first perform the troubleshooting for them.

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 deter\
mining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ra\
tio was lean or rich, etc. at
the time of the malfunction.

If the misfire does not occur when the vehicle is brought to the workshop,\
misfire can be confirmed by
reproducing the condition of the freeze frame data. Also, after finishing the repai\
r, confirm that there
is no misfire (See confirmation driving pattern).

When either of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data
is over the range of 20 %, there is a possibility that the air±fuel ratio is inclining eit\
her to ºRICHº (±20
% or less) or ºLEANº (+20 % or more).

When COOLANT TEMP in the freeze frame data is less than 80
C (176
F), there is a possibility of
misfire only during warming up the engine.

If the misfire cannot be reproduced, the reason may be because of the dr\
iving the vehicle with lack
of fuel, the use of improper fuel, a stain on the ignition plug, etc.

Be sure to check the value on the misfire counter after the repair.

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