Page 393 of 5135
05±256
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)
Page 394 of 5135
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±247
AVENSIS REPAIR MANUAL (RM1018E)
DTCP0606/89ECM/PCM PROCESSOR
CIRCUIT DESCRIPTION
DTC No.DTC Detection ConditionTrouble Area
P0606/89ECM inside errorECM
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.
CHECK AND REPLACE ECM (See page 01±32)
05C75±01
Page 395 of 5135

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±257)
A79101
2 +B DUTY1
GND 3
I10
ISC Valve
G±R10
E12 RSDECM
B±R 12
EA1 B±R
W±B7
E12 E1
BR
EF
±
DIAGNOSTICS SFI SYSTEM (1AZ±FE)
05±243
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0511/33 IDLE AIR CONTROL CIRCUIT
CIRCUIT DESCRIPTION
The rotary solenoid type idle speed control (ISC) valve is lo-
cated under the throttle body and intake air bypassing the
throttle valve is directed to the idle speed control (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 idle speed control (ISC) valve only to
perform idle±up and provide feedback for the target idling
speed.
DTC No.DTC Detecting ConditionTrouble Area
P0511/33Idle speed continues to vary greatly from target speed
(1 trip detection logic)
Open or short in idle speed control (ISC) valve circuit
Idle speed control (ISC) valve is stuck or closed
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.
05C74±01
Page 396 of 5135

123
A66264+B (+)GND (±)
ISC valve Connector
Wire Harness Side
I10
05±244
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
When using hand±held tester:
1PERFORM ACTIVE TEST USING HAND±HELD TESTER(CHECK ISC VALVE OPERATION)
(a)Warm up the engine to the normal operating temperature.
(b)Switch off all the accessories.
(c)Switch off the A/C.
(d)Shift the lever to the neutral position.
(e)Connect the hand±held tester to the DLC3 on the vehicle.
(f)Select the item ºDIAGNOSIS / OBD/MOBD / ACTIVE TEST / ISC DUTY RATIOº.
(g)Check that the engine RPM varies when changing the ISC duty ratio.
Engine RPM:
Engine RPM fluctuates ups and downs in respose to the ISC duty ratio var\
iation.
OKCHECK FOR INTERMITTENT PROBLEMS(See page 05±149)
NG
2 CHECK HARNESS AND CONNECTOR
(a) Disconnect the ISC valve connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage between the terminals of the ISC valve wire harness side connector.
Standard:
Symbols (Terminal No.)Specified condition
+B (I10±2) ± GND (I10±3)9 to 14 V
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
Page 397 of 5135

A65745
RSD
E12ECM Connector
E1
A65745
RSD
E12
ECM Connector
E1
123
A66264
DUTY ISC valve Connector
Wire Harness SideGND
I10
A65745
RSD (+)
E12
ECM Connector
E1 (±)
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±245
AVENSIS REPAIR MANUAL (RM1018E)
3CHECK HARNESS AND CONNECTOR(RSD CIRCUIT)
(a)Disconnect the ISC valve connector.
(b)Disconnect the E12 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 (E12±10)ContinuityGND (I10±3) ± E1 (E12±7)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
DUTY (I10±1)or RSD (E12±10) ± Body groundrNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4INSPECT THLOTTLE BODY IDLE SPEED CONTROL VALVE ASSY (See page 10±18)
NG REPLACE THLOTTLE BODY IDLE SPEED CONTROL VALVE ASSY
OK
CHECK AND REPLACE ECM (See page 01±32)
When not using hand±held tester:
1 INSPECT ECM
(a) Disconnect the E12 ECM connector.
(b) Turn the ignition switch ON.
(c) Measure the voltage between the terminals of the E4 ECM connector.
Standard:
Symbols (Terminal No.)Specified condition
RSD (E12±10) ± E1 (E12±7)9 to 14 V
OK Go to step 3
NG
Page 398 of 5135
05±246
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
2INSPECT THLOTTLE BODY IDLE SPEED CONTROL VALVE ASSY (See page 10±18)
NG REPAIR OR REPLACE THLOTTLE BODY IDLE
SPEED CONTROL VALVE ASSY
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
3 INSPECT THLOTTLE BODY IDLE SPEED CONTROL VALVE ASSY (See page 10±18)
NG REPAIR OR REPLACE THLOTTLE BODY IDLE
SPEED CONTROL VALVE ASSY
OK
4 CHECK BLOCKAGE OF ISC VALVE AND PASSAGE TO BYPASS THROTTLE VA LV E
NG REPAIR OR REPLACE THLOTTLE BODY IDLE
SPEED CONTROL VALVE ASSY
OK
CHECK AND REPLACE ECM (See page 01±32)
Page 399 of 5135
A79413
From
Speed SensorSkid
Control
ECU4±Pulse
Combination
Meter4±Pulse
ECM 05±240
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0500/42 VEHICLE SPEED SENSOR ºAº
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 Detection ConditionTrouble Area
P0500/42
During the vehicle is being driven, no vehicle speed sensor
signal to the ECM
(2 trip detection logic)
Open or short in speed sensor circuit
Speed sensor
Combination meter
ECM
Skid control ECU
05C73±01
Page 400 of 5135
A76866
Combination MeterECM
C11 V±W
SPD
17
V±W E10
J/C
18H
J10
(LHD) J20
H
(RHD) H
J10
(LHD) J20
H
(RHD)
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±241
AVENSIS REPAIR MANUAL (RM1018E)
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.
1CHECK OPERATION OF SPEEDOMETER
(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(See page 05±1500)
OK