TOYOTA AVENSIS 2005 Service Repair Manual

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

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


NE+NE±
A52871
Camshaft Position Sensor Connector
Wire Harness Side
C1
A81698
G2+ NE±
ECM Connector E11
05±438
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
2CHECK HARNESS AND CONNECTOR(ECM ± CAMSHAFT POSITION SENSOR)
(a)Disconnect the C1 camshaft position sensor connector.
(b)Disconnect the E11 ECM connector.
(c)Check for continuity between the wire harness side con- nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
Camshaft position sensor (C1±1) ± G2+ (E11±27)ContinuityCamshaft position sensor (C1±2) ± NE± (E11±24)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
Camshaft position sensor (C1±1)or G2+ (E11±27)
± Body ground
NocontinuityCamshaft position sensor (C1±2)or NE± (E11±24) ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS ORCONNECTOR
OK
3CHECK SENSOR INSTALLATION(CAMSHAFT POSITION SENSOR)
(a)Inspect the camshaft position sensor installation. NGTIGHTEN SENSOR
OK
4INSPECT CAMSHAFT
(a)Remove the camshafts (See page 14±240).
(b) Check the camshaft lobes. NG REPLACE CAMSHAFT
OK
CHECK AND REPLACE ECM (See page 01±32)

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±422
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
1CHECK OTHER DTC OUTPUT(IN ADDITION TO MISFIRE DTCS)
(a)Read the DTC using the hand±held tester. Result :
DisplayProceed to
DTC ºP0300, P0301, P0302, P0303 and/or P0304º are output.A
DTC ºP0300, P0301, P0302, P0303 or P0304º and other codes are outp\
ut.B
HINT:
If any other codes besides ºP0300, P0301, P0302, P0303 and/or P0304º are output, perform the trouble-
shooting for those DTCs first.
BGO TO RELEVANT DTC CHART (See page 05±309)
A
2 CHECK WIRE HARNESS, CONNECTOR AND VACUUM HOSE IN ENGINE ROOM
(a) Check the connection conditions of the wire harness and connector.
(b) Check the disconnection, piping and break of the vacuum hose. NG REPAIR OR REPLACE, THEN CONFIRM THATTHERE IS NO MISFIRE
OK
3 CHECK CONNECTION OF PCV HOSE
NG REPAIR OR REPLACE PCV HOSE
OK
4 READ VALUE OF HAND±HELD TESTER(NUMBER OF MISFIRE)
(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 / CYL#1 ± CYL#4º.
(e) Read the number of misfire on the hand±held tester.
HINT:
When a misfire is not reproduced, be sure to branch below based on the s\
tored DTC. Result:
High Misfire Rate CylinderProceed to
1 or 2 cylindersA
More than 3 cylindersB
B Go to step 12
A

A78640
1.0 to 1.1 mm
(0.039 to 0.043 in.)
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±423
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK SPARK PLUG AND SPARK OF MISFIRING CYLINDER
(a)Remove the ignition coil with igniter assy.
(b)Remove the spark plug.
(c)Check the spark plug type.
Recommended spark plug:
DENSO madeSK20BR11
(d)Check the spark plug electrode gap.Electrode gap: 1.0 to 1.1 mm (0.039 to 0.043 in.)
Maximum electrode gap: 1.3 mm (0.051 in.)
NOTICE:
If adjusting the gap of a new spark plug, bend only the base
the ground electrode. Do not touch the tip. Never attempt
to adjust the gap on a used plug.
(e)Check the electrode for carbon deposits.
(f)Perform a spark test.
CAUTION:
Each injector connector must be disconnected.
NOTICE:
Do not crank the engine for more than 2 seconds. (1)Install the spark plug to the ignition coil with igniter,and connect the ignition coil with igniter connector.
(2)Disconnect the injector connectors.
(3)Ground the spark plug.
(4)Check if spark occurs while the engine is being
cranked.
Standard: Spark jumps across electrode gap.
NGGo to step 19
OK
6CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER (See page 14±181)
NGREPAIR OR REPLACE
OK
7CHECK VALVE CLEARANCE OF MISFIRING CYLINDER (See page 14±186)
NG ADJUST VALVE CLEARANCE (See page 14±186)
OK

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




3020
10
5
3
02040
0.1 1
0.3 0.2
0.5 2
6080100
±20
(±4)(104)(140)(176) (32)(68)(212)


30
20
10
5
3
02040
0.1 1
0.3 0.2
0.5 2
6080100
±20
(±4)(104)(140)(176) (32)(68)(212)
A81700
Ohmmeter
Acceptable
TEMPERATURE C ( F)
RESISTANCE K 
05±426
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
16INSPECT ENGINE COOLANT TEMPERATURE SENSOR
(a)Remove the engine coolant temperature sensor.
(b)Measure the resistance between the terminals. Resistance:
2.32 to 2.59 k at 20 C (68 F)
0.310 to 0.326 k at 80 C (176 F)
NOTICE:
In case of checking the engine coolant temperature sensor
in the water, be careful not to allow water to go into the ter-
minals. After checking, dry the sensor.
HINT:
Alternate procedure: Connect an ohmmeter to the installed en-
gine coolant temperature sensor and read the resistance. Use
an infrared thermometer to measure the engine temperature in
the immediate vicinity of the sensor. Compare these values to
the resistance/temperature graph. Change the engine temper-
ature (warm up or allow to cool down) and repeat the test.
NGREPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK
17INSPECT MANIFOLD ABSOLUTE PRESSURE SENSOR (See page 05±342)
NG REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR
OK
18 SWITCH 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. B AGAIN GO TO STEP 5
A
CHECK FOR INTERMITTENT PROBLEMS