2005 TOYOTA AVENSIS Circuit


 
AB B+
Power Transistor
Platinum Hot Wire
(Heater)
Output
Voltage
Temperature
sensor
Platinum Hot Wire (Heater)
Temperature sensor

 
AB B+
Power Transistor
Platinum Hot Wire
(Heater)
Output
Voltage
Temperature
sensor
Platinum Hot Wire (Heater)
Temperature sensor

 
AB B+
Power Transistor
Platinum Hot Wire
(Heater)
Output
Voltage
Temperature
sensor
Platinum Hot Wire (Heater)
Temperature sensor
A53295
05±336
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0100 MASS OR VOLUME AIR FLOW CIRCUIT
DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT
LOW INPUT
DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT
HIGH INPUT
CIRCUIT DESCRIPTION
The mass air flow meter uses a platinum hot wire. The hot wire mass air flow meter consists of a platinum
hot wire, a temperature sensor and a control circuit installed in a plastic housing. The hot wire mass air flow
meter works on the principle that the hot wire and temperature sensor located in the intake air bypass of the
housing detect any changes in the intake air temperature.
The hot wire is maintained at the set temperature by controlling the current flow through the hot wire. This
current flow is then measured as the output voltage of the mass air flow meter.
The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit, with
the power transistor controlled so that the potential of A and B remains equal to maintain the set temperature.

DTC Detection ConditionTrouble Area
P0100Open or short in mass air flow meter circuit with engine speed
4,000 rpm or less for more than 3 seconds.
Ohti ifltiit
P0102Open in mass air flow meter circuit with engine speed 4,000
rpm or less for more than 3 seconds.
Open or short in mass air flow meter circuit

Mass air flow meter


ECM
P0103Short in mass air flow meter circuit with engine speed 4,000
rpm or less for more than 3 seconds.
ECM
HINT:
After confirming DTC ºP0100, P0102 or P0103º, use the hand±held tester to confirm the air flow rate from
the ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALLº.
Air flow rate (gm/s)Malfunction
Approximately 0.0
Mass air flow meter power source circuit open

VG circuit open or short
271.0 or more
EVG circuit open
05CJE±01

A54396
+B
Wire Harness Side
Mass Air Flow Meter Connector
A6
A66053
Engine Room R/B No. 4
EFI Relay
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±341
AVENSIS REPAIR MANUAL (RM1018E)
7CHECK HARNESS AND CONNECTOR(EFI RELAY ± MASS AIR FLOW METER)
(a)Inspect the EFI No. 2 fuse.
(1)Remove the EFI No. 2 fuse from the engine room
R/B No. 4.
(2)Check for continuity in the EFI No. 2 fuse.
Standard: Continuity
(b)Disconnect the A6 mass air flow meter connector.
(c)Remove the EFI relay from the engine room R/B No. 4.
(d)Check for continuity between the wire harness side con- nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
+B (A6±1) ± EFI relay (3)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
+B (A6±1) or EFI relay (3) ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK FOR ECM POWER SOURCE CIRCUIT (See page 05±502)

05±330
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0031 OXYGEN SENSOR HEATER CONTROL
CIRCUIT LOW (BANK 1 SENSOR 1)
DTC P0032 OXYGEN SENSOR HEATER CONTROL
CIRCUIT HIGH (BANK 1 SENSOR 1)
DTC P0037 OXYGEN SENSOR HEATER CONTROL
CIRCUIT LOW (BANK 1 SENSOR 2)
DTC P0038 OXYGEN SENSOR HEATER CONTROL
CIRCUIT HIGH (BANK 1 SENSOR 2)
DTC P0051 OXYGEN SENSOR HEATER CONTROL CIR-
CUIT LOW (BANK 2 SENSOR 1)
DTC P0052 OXYGEN SENSOR HEATER CONTROL
CIRCUIT HIGH (BANK 2 SENSOR 1)
DTC P0057 OXYGEN SENSOR HEATER CONTROL
CIRCUIT LOW (BANK 2 SENSOR 2)
DTC P0058 OXYGEN SENSOR HEATER CONTROL
CIRCUIT HIGH (BANK 2 SENSOR 2)
05CJD±01

A72920
Reference (Bank 1 Sensor 1 System Drawing)Heated Oxygen Sensor
EFI Relay
Heater
SensorOX1A HT1A
Duty
Control
ECM
From
Battery EFI Fuse
E2
EFI No. 2
Fuse
MREL
OX HT
E1
+B
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±331
AVENSIS REPAIR MANUAL (RM1018E)
CIRCUIT DESCRIPTION
Refer to DTC P0130 on page 05±363.
HINT:
The ECM provides a pulse width modulated control circuit to adjust current \
through the heater. The heated
oxygen sensor heater circuit uses a relay on the B+ side of the circuit.
DTC No.DTC Detection ConditionTrouble Area
P0031
P0037Heated current is 0.2 A or less when heater operates with +B >
10.5 V and < 11.5 V (1 trip detection logic)
Open in heater circuit of heated oxygen sensor

Heated oxygen sensor heater

EFI relay
P0037
P0051
P0057Heated current is 0.25 A or less when heater operates with +B

11.5 V (1 trip detection logic)
EFI relay

EFI fuse

EFI No. 2 fuse

ECM
P0032
P0038
P0052
P0058
Heated current exceeds 2 A when heater operates.
(1 trip detection logic)
Short in heater circuit of heated oxygen sensor

Heated oxygen sensor heater

ECM
HINT:

Bank 1 refers to the No. 1 and No. 4 cylinders.

Bank 2 refers to the No. 2 and No. 3 cylinders.

Sensor 1 refers to the sensor closest to the engine assembly.

Sensor 2 refers to the sensor farthest away from the engine assembly.
WIRING DIAGRAM
Refer to DTC P0130 on page 05±363.
INSPECTION PROCEDURE
HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.

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.

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±329
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0016CRANKSHAFT POSITION ±CAMSHAFT
POSITION CORRELATION (BANK 1 SENSOR
A)
CIRCUIT DESCRIPTION
Refer to DTC P0335 on page 05±433.
DTC No.DTC Detection ConditionTrouble Area
P0016Deviation in crankshaft position sensor signal and camshaft
position sensor (bank 1) signal (2 trip detection logic)
Mechanical system
(Timing chain has jumped a tooth, chain stretched)

ECM
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.
1CHECK VALVE TIMING (See page 14±186)
(a) Check for loose and jumping teeth of timing chain.
NGADJUST VALVE TIMING (See page 14±186) (REPAIR OR REPLACE TIMING CHAIN)
OK
CHECK AND REPLACE ECM (See page 01±32)
05CE0±01

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±325
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0011CAMSHAFT POSITION ºAº ±TIMING OVER±
ADVANCED OR SYSTEM PERFORMANCE
(BANK 1)
DTCP0012CAMSHAFT POSITION ºAº ±TIMING OVER± RETARDED (BANK 1)
CIRCUIT DESCRIPTION
Refer to DTC P0010 on page 05±322.
DTC No.DTC Detection ConditionTrouble Area
P0011
Condition (a) or (b) continues after engine is warmed up and
engine speed at 400 to 4,000 rpm (Problem of the advanced
OCV.):
(a)Valve timing does not change from current valve timing
(b)Current valve timing is fixed

Valve timing

OCV
P0012
Condition (a) or (b) continues after engine is warmed up and
engine speed at 400 to 4,000 rpm (Problem of the retarded
OCV.):
(a)Valve timing does not change from current valve timing
(b)Current valve timing is fixed
OCV

Camshaft timing gear assy

ECM
WIRING DIAGRAM
Refer to DTC P0010 on page 05±322.
INSPECTION PROCEDURE
HINT:
Advanced timing over
(Valve timing is out of specified range)P0011
Retarded timing over
(Valve timing is out of specified range)P0012

If DTC ºP0011 or P0012º is displayed, check VVT system circuit.

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.
1CHECK VALVE TIMING (See page 14±186)
NGADJUST VALVE TIMING (See page 14±186)
OK
05CDZ±01

A71007
Air Flow Meter Crankshaft Position Sensor
Actual Valve TimingCorrection Target Valve Timing
Feedback
Duty Control ECM
Camshaft Timing
Oil Control
Valve (OCV)
Vehicle Speed Signal Engine Coolant Temp. SensorThrottle Position Sensor
Camshaft Position Sensor
05±322
± DIAGNOSTICSSFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0010 CAMSHAFT POSITION ºAº ACTUATOR
CIRCUIT (BANK 1)
HINT:
This is the procedure of oil control valve (OCV).
CIRCUIT DESCRIPTION
The VVT system controls the intake camshaft to provide the optimal valve timing for every driving condition. This control
is performed based on the signals, such conditions as intake air volume, throttle position and engine coolant tempera-
ture.
The ECM controls the oil control valve (OCV), based on the signals output from the sensors. The VVT controller regu-
lates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft
and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions de-
crease under overall driving conditions. Also, the ECM detects the actual valve timing using the signals from the cam-
shaft position sensor and the crankshaft position sensor, and performs feedback control. This is how target valve timing
is achieved by the ECM.
DTC No.DTC Detection ConditionTrouble Area
P0010Open or short in OCV circuit

Open or short in OCV circuit

OCV

ECM
05CDY±01

05CDX±01
05±320
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
PROBLEM SYMPTOMS TABLE
When the malfunction is not confirmed in the DTC check and the problem still\
can not be confirmed in the
basic inspection either, proceed to this problem symptoms table and troubleshoot according to the number
given below.
SymptomSuspected AreaSee page
Engine does not crank (Does not start)
2. Starter
3. Starter relay
4. Park/neutral position switch19±10
19±10 40±8
No initial combustion (Does not start)
1. ECM power source circuit
2. Ignition coil assy
3. Fuel pump control circuit
4. Injector circuit05±502
05±439
05±507
05±415
No complete combustion (Does not start)
1. Ignition coil assy
2. Fuel pump control circuit
3. Injector circuit05±439
05±507
05±415
Engine cranks normally (Difficult to start)
1. Starter signal circuit
2. Ignition coil assy
3. Spark plug
4. Compression
5. Injector circuit
6. Fuel pump control circuit05±513
05±43918±14
14±181
05±415
05±507
Cold engine (Difficult to start)
1. Starter signal circuit
2. Injector circuit
3. Ignition coil assy
4. Spark plug
5. Fuel pump control circuit05±513
05±415
05±439 18±14
05±507
Hot engine (Difficult to start)
1. Starter signal circuit
2. Injector circuit
3. Ignition coil assy
4. Spark plug
5. Fuel pump control circuit05±513
05±415
05±439
18±14
05±507
High engine idle speed (Poor idling)
1. ECM power source circuit
2. Park/neutral position switch
3. Back up power source circuit05±502
40±8
05±467
Low engine idle speed (Poor idling)
1. Park/neutral position switch
2. Injector circuit
3. Back up power source circuit
4. Fuel pump control circuit40±8
05±415
05±467
05±507
Rough idling (Poor idling)
1. Mass air flow meter circuit
2. Vacuum sensor circuit
3. Injector circuit
4. Fuel pump control circuit
5. Ignition coil assy
6. Compression
7. Back up power source circuit05±336
05±342
05±415
05±507
05±439
14±181
05±467
Hunting (Poor idling)
1. Mass air flow meter circuit
2. Vacuum sensor circuit
3. ECM power source circuit05±336
05±342
05±502
Hesitation/Poor acceleration (Poor driveability)
1. Mass air flow meter circuit
2. Vacuum sensor circuit
3. Injector circuit
4. Ignition coil assy
5. Fuel pump control circuit05±336
05±342
05±415
05±439
05±507
Muffler explosion after fire (Poor driveability)
1. Ignition coil assy
2. Spark plug
3. Injector circuit05±439 18±14
05±415