2005 TOYOTA AVENSIS Circuit

A58697
Intake Air
Chamber
Throttle Valve
To Cylinder
ISC Valve
Valve
ECM
Signal From
Air
Cleaner
From
Terminal 2 of
EFI No.1 Fuse
(See Page 05±124)
A79101
2 VISC DUTY1
GND 3
I10
ISC Valve
G±R5
E13 RSDECM
B±R 12
EA1 B±R
W±B7
E13 E01
W±B
EG
05±100
±
DIAGNOSTICS SFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0505 IDLE CONTROL SYSTEM MALFUNCTION
CIRCUIT DESCRIPTION
The rotary solenoid type of the idle speed control (ISC) valve is
located under the throttle body and intake air bypassing the
throttle valve is directed to the ISC valve through the passage.
In this way the intake air volume bypassing the throttle valve is
regulated, controls the engine speed.
The ECM operates the ISC valve only to perform idle±up and
provide feedback for the target idling speed.
DTC No.DTC Detecting ConditionTrouble Area
P0505Idle speed continues to vary greatly from target speed
(1 trip detection logic)

Open or short in ISC valve circuit

ISC valve is stuck or closed

PCV hose

A/C switch circuit

Air induction system

ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using \f  \b \f\f
 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.
05B46±02

A65743
RSD
E13ECM Connector
E01
123
A66264
DUTY ISC valve Connector
Wire Harness SideGND
I10
05±102
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
3CHECK HARNESS AND CONNECTOR(RSD CIRCUIT)
(a)Disconnect the ISC valve connector.
(b)Disconnect the E13 ECM connector.
(c)Check for continuity between the wire harness side con- nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
DUTY (I10±1) ± RSD (E13±5)ContinuityGND (I10±3) ± E01 (E13±7)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
DUTY (I10±1)or RSD (E13±5) ± Body groundrNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4INSPECT THLOTTLE BODY IDLE SPEED CONTROL VALVE ASSY (See page 10±1)
NG REPLACE THLOTTLE BODY IDLE SPEED CONTROL VALVE ASSY
OK
CHECK AND REPLACE ECM (See page 01±32)

A79413
From
Speed SensorSkid
Control
ECU4±Pulse
Combination
Meter4±Pulse
ECM
A79092
C11
Combination Meter
Junction Connector
17
V±W
E10ECM
V±W
SPD 18
J10
J20 H
*1*2
*1: LHD
*2: RHD J20 J10
*1 *2 HHH 05±98
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION
CIRCUIT DESCRIPTION
The speed sensor for skid control ECU detects the wheel speed and sends the appropriate signals to the
skid control ECU.
The skid control ECU converts these signals into a 4±pulse signal and outputs it to the combination meter.
After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit in-
side the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based
on the frequency of these pulse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
During the vehicle is being driven, no vehicle speed sensor
signal to the ECM
(1 trip detection logic: A/T)
(2 trip detection logic: M/T)
Open or short in speed sensor circuit

Speed sensor

Combination meter

ECM

Skid control ECU
WIRING DIAGRAM
05B45±02

A18294
SPD (+)E1 (±)ECM Connector
E12 E10
A62954
Turn Wheel
4.5±5.5V
0V
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
05±99
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using \f \b\f\f
 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.
1CHECK OPERATION OF SPEEDOMETER(SPEEDOMETER OPERATION)
(a)Drive the vehicle and check that the operation of the speedometer in the\
combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display i\
s normal.
NGCHECK SPEEDOMETER CIRCUIT
OK
2INSPECT ECM(CHECK VOLTAGE)
(a)Shift the lever to the neutral position.
(b)Jack up the vehicle.
(c)Turn the ignition switch ON.
(d)Measure the voltage between the terminals of the E10 and E12 ECM connectors as the wheel is turned slowly.
Standard:
Symbols (Terminal No.)Specified condition
SPD (E10±17) ± E1 (E12±7)Generated intermittently
HINT:
The output voltage should fluctuate up and down similarly to the
diagram on the left when the wheel is turned slowly.
NGREPAIR OR REPLACE HARNESS AND CONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)

A79073
From
Terminal 3 of
EFI Relay
(See Page 05±124)B±W
EA113
B±W 2V5
VSV for EVAP
1 W±G E1312
EVP1ECM
Engine Room R/B No.4 EFI No.2
4 1 2
B±W
4
05±94
±
DIAGNOSTICS SFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0443 EVAPORATIVE EMISSION CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT
MALFUNCTION
CIRCUIT DESCRIPTION
To reduce HC emissions, evaporated fuel from the fuel tank is routed through the charcoal canister to the
intake manifold for combustion in the cylinders.
The ECM changes the duty signal to the VSV for EVAP so that the intake quantity of HC emissions becomse
properly for the driving conditions (engine load, engine speed, vehicle speed, \
etc.) after the engine is
warmed up.
DTC No.DTC Detecting ConditionTrouble Area
P0443Proper response to ECM command does not occur (1 trip
detection logic)
Open or short in VSV for EVAP circuit

VSV for EVAP

ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using \f  \b \f\f
 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.
05C6D±01

A66053
Engine Room R/B No.4EFI Relay



A79070
Engine Room R/B No.4EFI No.2 Fuse
1
2
\bA52933
Wire Harness Side
Vacuum Switching Valve Connector
V5
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
05±97
AVENSIS REPAIR MANUAL (RM1018E)
6CHECK HARNESS AND CONNECTOR(EFI RELAY ± VSV FOR EVAP)
(a)Remove the EFI relay from the engine room R/B No.4.
(b)Remove the EFI No.2 fuse from the engine room R/B
No.4.
(c)Disconnect the VSV connector.
(d)Check for continuity between the wire harness side con- nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
EFI relay (3) ± EFI No.2 fuse (1)ContinuityEFI No.2 fuse (2) ± VSV (V5±1)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
EFI relay (3) or EFI No.2 fuse (1) ± Body groundNocontinuityEFI No.2 fuse (2) or VSV (V5±1) ± Body groundNo continuity
NOTICE:
Do not insert the tester leads hard in the procedure (c), the
holder may be damaged.
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK FOR ECM POWER SOURCE CIRCUIT (See page 05±124)

A58692
Waveform of heated oxygen
Sensor in front of CatalystNormal CatalystWaveform of Heated Oxygen
Sensor behind Catalyst
A58693
Engine Speed
2,500 ± 3,000 rpm
Idling
IG SW OFF
Warmed up 3 min. Check Time (a)(b)(c) (d)
± DIAGNOSTICSSFI SYSTEM (1ZZ±FE/3ZZ±FE)
05±91
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW
THRESHOLD (BANK 1)
CIRCUIT DESCRIPTION
The ECM compares the 2 waveforms of the heated oxygen sensors located before and after the catalyst
to determine whether or not the catalyst performance has deteriorated.
Air±fuel ratio feedback compensation keeps the waveform of the heated oxygen sensor in front of the cata-
lyst alternates between back and forth, from rich to lean.
If the catalyst is functioning normally, the waveform of the heated oxygen sensor behind the catalyst switches
back and forth between rich and lean much more slowly than the waveform of the heated oxygen sensor
in front of the catalyst.
When both waveforms change at a similar rate, it indicates that the catalyst performance has deteriorated.
DTC No.DTC Detecting ConditionTrouble Area
P0420
After engine and catalyst are warmed up, and while vehicle is
driven within set vehicle and engine speed range, waveforms
of heated oxygen sensors have same amplitude (2 trip detec-
tion logic)
Gas leakage in exhaust system

Heated oxygen sensor

Three±way catalytic converter

ECM
CONFIRMATION DRIVING PATTERN
05B43±02

A63955
GND
CH1
(G2)
CH2
(NE+) GND
05±88
±
DIAGNOSTICS SFI SYSTEM(1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0340CAMSHAFT POSITION SENSOR CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The camshaft position sensor (G2 signal) consists of a magnet, iron core \
and pickup coil.
The G2 signal plate has 3 teeth on its outer circumference and is instal\
led on the camshaft timing pulley.
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 electromoti\
ve force in the pickup coil.
The NE signal plate (crankshaft timing pulley) has 34 teeth and is instal\
led to the crankshaft. The NE signal
sensor generates 34 signals at every engine revolution. The ECM detects \
the crankshaft angle and the en-
gine revolution based on the NE signals, and the cylinder and the angle of the VVT based on the combination
of the G2 and NE signals.
DTC No.DTC Detecting ConditionTrouble Area
P0340

No camshaft position sensor signal to the ECM during crank-
ing

Open in NE± circuit

Open or short in camshaft position sensor circuit

Camshaft position sensor

Intake camshaft

Timing chain has jumped a tooth

ECM
Reference: Inspection using the oscilloscope.
HINT:
The correct waveform is as shown on the left.
ItemContents
TerminalCH1: G2 ± NE±
CH2: NE+ ± NE±
Equipment Set5V/DIV, 20ms/DIV
ConditionDuring cranking or idling
WIRING DIAGRAM
Refer to DTC P0335 on page05±84.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using \f  \b \f\f
 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.
05B42±03