TOYOTA AVENSIS 2005 Service Repair Manual

A75325
HTAF+
+B
AF±
Bank 1, Sensor 1
A7
A/F Sensor
A79112
Bank 2, Sensor 1
A8
A/F Sensor HT
AF+
+B
AF±
B16200
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±183
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM
Refer to DTC P2237/21 on page 05±248.
INSPECTION PROCEDURE
HINT:

If different DTCs that are related to a different system are output simultaneously while terminal E2 is
used as a ground terminal, terminal E2 may be open.

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 d\
etermining 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.
1 INSPECT AIR FUEL RATIO SENSOR(RESISTANCE OF A/F SENSOR HEATER)
(a) Disconnect the A/F sensor connector.
(b) Measure resistance between terminals HT and +B of the A/F sensor.
Resistance: 1.8 to 3.4
(20 C)
NG REPLACE AIR FUEL RATIO SENSOR
OK
2 INSPECT A/F RELAY
(a) Remove the A/F relay from the engine room R/B No.4.
(b) Inspect the A/F relay. Standard:
Terminal No.Specified condition
1 ± 2Continuity
No Continuity
3 ± 5Continuity
(Apply battery voltage terminals 1 and 2)
NG REPLACE A/F RELAY
OK

A18294
HA1A (+)HA2A (+)E04 (±)
E12
ECM Connector
E05 (±)
05±184
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
3INSPECT ECM(VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between the applicable terminals of the E12 ECM connectors.
Standard:
Symbols (Terminal No.)Specified condition
HA1A (E12±6) ± E04 (E12±4)9to14VHA2A (E12±5) ± E05 (E12±3)9 to 14 V
HINT:

The HA1A means the heated oxygen sensor bank 1 sen-
sor 1.

The HA2A means the heated oxygen sensor bank 2 sen-
sor 1.
OKCHECK AND REPLACE ECM (See page 01±32)
NG


A76787
Wire Harness Side
+B
HT
A7Bank 1 Sensor 1
A/F Sensor Connector
A79114
A8Bank 2 Sensor 1
Wire Harness Side
+B
HT
A/F Sensor Connector
A65745
HA1A HA2A
E12
ECM Connector

A79113
Engine Room R/B No.4
A/F Relay
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±185
AVENSIS REPAIR MANUAL (RM1018E)
4CHECK HARNESS AND CONNECTOR(A/F SENSOR ± ECM, A/F SENSOR ± A/F
RELAY)
(a)Check the harness and connector between the ECM and
A/F sensor connectors.
(1)Disconnect the A7 or A8 A/F sensor connector.
(2)Disconnect the E12 ECM connector.
(3)Check for continuity between the wire harness sideconnectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
HT (A7±1) ± HA1A (E12±6)ContinuityHT (A8±1) ± HA2A (E12±5)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
HT (A7±1) or HA1A (E12±6) ± Body groundNocontinuityHT (A8±1) or HA2A (E12±5) ± Body groundNo continuity
(b)Check the harness and connector between the A/F sen- sor connector and A/F relay.
(1)Disconnect the A7 or A8 A/F sensor connector.
(2)Remove the A/F relay from the engine room R/B
No.4.
(3)Check for continuity between the wire harness side
connectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
+B (A7±2) ± A/F relay (3)Continuity+B (A8±2) ± A/F relay (3)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
+B (A7±2) or A/F relay (3) ± Body groundNocontinuity+B (A8±2) or A/F relay (3) ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)

±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±181
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0016/18CRANKSHAFT POSITION ±CAMSHAFT
POSITION CORRELATION (BANK 1 SENSOR
A)
CIRCUIT DESCRIPTION
Refer to DTC P0335/12, 13 and P0339/13 on page 05±226.
DTC No.DTC Detection ConditionTrouble Area
P0016/18Deviation in crankshaft position sensor signal and VVT sensor
1 signal (2 trip detection logic)
Mechanical system (Timing chain has jumped a tooth, chain
stretched)

ECM
WIRING DIAGRAM
Refer to DTC P0335/12, 13 and P0339/13 on page 05±226.
INSPECTION PROCEDURE
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±139)
NGADJUST VALVE TIMING (See page 14±139)
OK
CHECK AND REPLACE ECM (See page 01±32)
05C7F±01

A71007
MassAir 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
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
05±169
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0010/39 CAMSHAFT POSITION ºAº ACTUATOR
CIRCUIT (BANK 1)
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 oil control valve (OCV). As result, the relative position
between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves,
exhaust emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using the
signals from the camshaft 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
P0010/39Open or short in oil control valve (OCV) circuit

Open or short in oil control valve circuit

Oil control valve

ECM
05C6R±01

A59779
C2
Camshaft Timing Oil
Control Valve1
2 ECM
W±G OC1+
14
Y±B OC1±
E13
15
E13
05±170
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM
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.
When using hand±held tester:
1PERFORM ACTIVE TEST BY HAND±HELD TESTER(OCV OPERATION)
(a)Connect the hand±held tester to the DLC3.
(b)Start the engine and warm it up.
(c)Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(d)Select the item ºDIAGNOSIS / OBD/MOBD/ ACTIVE TEST / VVT CTRL B1 or V\
VT CTRL B2º.
(e)Check the engine speed when operating the OCV by the hand±held tester. Standard:
Tester operationSpecified condition
OCV is OFFNormal engine speed
OCV is ONRough idle or engine stall
OKCHECK FOR INTERMITTENT PROBLEMS (See page 05±149)
NG
2INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY (See page 10±20)
NG REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY
OK

A79111
OCV Signal Waveform1 msec./Division 5 V/
Division
GND
(A)(A) (A)
E13
OC1 +OC1±
A54386
Wire Harness Side
C2
Camshaft Timing Oil Control Valve
Connector
A65743ECM Connector
E13
OC1+OC1±
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±171
AVENSIS REPAIR MANUAL (RM1018E)
3INSPECT ECM(OCV SIGNAL)
(a)Inspection using the oscilloscope.
(b)During idling, check the waveform between the terminals
of the E13 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
OC1+ (E13±15) ± OC1± (E13±14)Correct waveform is as shown
HINT:
The waveform frequency (A) is lengthened as the engine speed
becomes higher.
NGCHECK AND REPLACE ECM (See page 01±32)
OK
4 CHECK HARNESS AND CONNECTOR(ECM ± OCV)
(a) Disconnect the camshaft timing oil control valve connec- tor.
(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
Oil control valve (C2±1) ± OC1+ (E13±15)ContinuityOil control valve (C2±2) ± OC1± (E13±14)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
Oil control valve (C2±1) or OC1+ (E13±15) ± Body groundNo continuityOil control valve (C2±2) or OC1± (E13±14) ± Body groundNo continuity
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK FOR INTERMITTENT PROBLEMS

A76968
C2
(±) (+)
Camshaft Timing Oil Control Valve
A79111
OCV Signal Waveform
1 msec./Division5 V/
Division
GND
(A) (A)
(A)
E13
OC1 + OC1±
05±172
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
When not using hand±held tester:
1 CHECK OPERATION OF OCV
(a) Disconnect the camshaft timing oil control valve connec-
tor.
(b) Apply battery positive voltage between the terminals of
the camshaft timing oil control valve.
(c) Check the engine speed.
Standard:
Engine speed is rough idle or engine is stalled.
NG REPLACE CAMSHAFT TIMING OIL CONTROL
VALVE ASSY
OK
2 INSPECT ECM(OCV SIGNAL)
(a) Inspection using the oscilloscope.
(b) During idling, check the waveform between the terminals
of the E13 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
OC1+ (E13±15) ± OC1± (E13±14)Correct waveform is as shown
HINT:
The waveform frequency (A) is lengthened as the engine speed
becomes higher.
NG CHECK AND REPLACE ECM
(See page )
OK

A54386
Wire Harness SideC2
Camshaft Timing Oil Control Valve
Connector
A65743ECM Connector
E13
OC1+OC1±
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±173
AVENSIS REPAIR MANUAL (RM1018E)
3CHECK HARNESS AND CONNECTOR(ECM ± OCV)
(a)Disconnect the camshaft timing oil control valve connec-
tor.
(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
Oil control valve (C2±1) ± OC1+ (E13±15)ContinuityOil control valve (C2±2) ± OC1± (E13±14)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
Oil control valve (C2±1) or OC1+ (E13±15) ± Body groundNocontinuityOil control valve (C2±2) or OC1± (E13±14) ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK FOR INTERMITTENT PROBLEMS(See page 05±149)

A76888
FL MAIN
StarterCircuit
Opening Relay
Start Position SWEFI Relay
AM2
BatteryECM
STA MREL Ignition SWFuel Pump
ST2
ST
Relay
(NE Signal) (A/T)FC
EFISTTr
(M/T)
(A/T) AM2 05±264
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
FUEL PUMP CONTROL CIRCUIT
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST2 of the ignition switch to
the starter relay coil and also current flows to terminal STA of the ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to the coil of the
E.F.I. circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump oper-
ates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
05C79±01