change time TOYOTA AVALON 2001 Service Repair Manual

BE214-01
I10058
Radio Receiver Assembly Power Amplifier CD Auto Changer BE-126
- BODY ELECTRICALAUDIO SYSTEM
1730 Author
: Date
:
2001 AVALON (RM808U)
AUDIO SYSTEM
DESCRIPTION
OUTLINE OF AVC-LAN
(a) What is AVC-LAN?
AVC-LAN is the abbreviation, which stands for Audio Visual Communication-Local Area Network.
This is a unified standard co-developed by 6 audio manufactures associated with Toyota Motor Corpo-
ration.
The Unified standard covers signals, such as audio signal, visual signal, signal for switch indication
and communication signal.
(b) Objectives
Recently the car audio system has been rapidly developed and functions have been changed drasti-
cally. The conventional system has been switched to the multi-media type such as a navigation sys-
tem. At the same time the level of customers needs to audio system has been upgraded. This lies be-
hind this standardization.
The concrete objectives are explained below.
(1) When products by different manufactures were combined together, there used to be a case that
malfunction occurred such as sound did not come out. This problem has been resolved by stan-
dardization of signals.
(2) Various types of after market products have been able to add or replace freely.
(3) Because of the above (2), each manufacture has become able to concentrate on developing
products in their strongest field. This has enabled many types of products provided inexpensive-
ly.
(4) Conventionally, a new product developed by a manufacture could not be used due to a lack of
compatibility with other manufactures products. Because of this new standard, users can enjoy
compatible products provided for them timely.
(c) The above descriptions are the objectives to introduce AVC-LAN. By this standardization, develop-
ment of new products will no longer cause systematic errors. Thus, this is very effective standard for
a product in the future.
HINT:

When +B short or GND short is detected in AVC-LAN circuit, communication stops. Accordingly the
audio system does not function normally.

When audio system is not equipped with a navigation system, audio head unit is the master unit. (When
audio system is equipped with a navigation system, radio receiver is the master unit.)

The car audio system using AVC-LAN circuit has a diagnosis function.

Each product has its own specified numbers called physical address. Numbers are also allotted to
each function in one product, which are called logical address.

Normal Mode
Service Check Mode
 A long beep (3 sec.)  3 beeps
Memory Clear ModeAfter 3 sec.
P240
ECHn
CLr Example:
Connection parts ( physical address): Radio receiver (P190), CD Auto Changer (P240), MD chnger (P3A0)
Turn ignition switch ON.
Push the ºDISCº switch 3 times
while pressing ºch1º and ºch6º
swithes.
HINT:
To exit from diagnosis mode,
press the ºDISCº switch for 1.7
sec. or turn ignition switch to
OFF
ºECHnº Detail
Display Mode
(Refer to (f))
CHEC
ºCHECº Detail
Display Mode
(Refer to (g))
Physical AddressP190
Physical AddressP3A0
Old
ºOldº Detail
Display Mode
(Refer to (h))
Result (Replaceing)
Result (Check)
Result (Old)
 After the memory is cleared, only the physical address is displayed cyclically.TUNE UP
TUNE UP
TUNE UP
TUNE UP TUNE DOWN
TUNE DOWN
TUNE DOWN
TUNE DOWN
TUNE DOWN
TUNE UP
ch5 (1.7 sec.)
: Indicates a switch operation
ch2
ch3
ch2
ch3
ch2
ch3
 When re-checking (ch1 switch is pressed) in that condition, the result is also
displayed as shown above.
- BODY ELECTRICALAUDIO SYSTEM
BE-129
1733 Author
: Date
:
2001 AVALON (RM808U)
(c) Display Screen for Service Check.

I19691
ºTUNE DOWNº Switch
º1chº Switch º2chº Switch º3chº Switchº4chº Switch º5chº Switchº6chº Switch
ºDISCº Switch
ºTUNE UPº Switch
- BODY ELECTRICALAUDIO SYSTEM
BE-133
1737 Author
: Date
:
2001 AVALON (RM808U)
2. Except Europe models:
DIAGNOSIS FUNCTION
Error codes over tuner and connected equipment are displayed on the screen of tuner.
(a) Diagnosis start-up
For shifting to diagnosis mode, push ºDISCº switch 3 times with pressing º1º and º6º of PRESET switch
at the same time while the audio power is OFF and ACC is ON.
To exit from diagnosis mode, press ºDISCº switch for 2 seconds or turn the ignition key OFF.
(When º1-190º is displayed, the mode is transferred to LAN check mode.)
(b) LAN check
When starting up the diagnosis mode, the mode turns to LAN check mode, the screen displays the
code numbers (physical address) of tuner and connected equipment. Smaller codes are displayed in
order, displayed code numbers are switched by operating TUNE ºUPº or ºDOWNº switch. In LAN check
mode, by pressing º5º of PRESET switch for more than 2 secs., diagnosis memory of each equipment
can be deleted, when deletion is completed, the mode returns to LAN check mode.
Code No. (physical address) List
Code No. (physical address)Equipment name
190Radio receiver assembly (Audio head unit)
240CD changer (in Luggage room)
360CD changer (in center console and glove compartment box)
440Power amplifier
(c) System check
When pressing º1º of PRESET switch in LAN check mode, the mode turns to the system check
mode, the system performs self diagnosis of connected equipment and displays the re-
sults.(ºSYSº (showing the system is under detection) is displayed.)
Perform the operation shown in the following illustration, then read the result of the inspection.

N02332
1
2 3
I13320
A
DC
B BE-56
- BODY ELECTRICALCOMBINATION METER
1660 Author
: Date
:
2001 AVALON (RM808U)
5. INSPECT VEHICLE SPEED SENSOR OPERATION
(a) Connect the positive (+) lead from battery to terminal 1
and negative (-) lead to terminal 2.
(b) Connect the positive (+) lead from tester to terminal 3 and
the negative (-) lead to terminal 2.
(c) Rotate the shaft.
(d) Check that there is voltage change from approx. 0 V to 11
V or more between terminals 2 and 3.
HINT:
The voltage change should be 4 times for every revolution of
the speed sensor shaft.
If operation is not as specified, replace the sensor.
6. INSPECT SPEEDOMETER RESISTANCE
Measure the resistance between terminals with fixing pointer to
the stopper.
Tester connectionResistance (W)
A - B250
C - D250
If resistance value is not as the specified, replace the meter.
7. INSPECT TACHOMETER/ON-VEHICLE
(a) Connect a tune-up test tachometer, and start the engine.
NOTICE:

Reversing the connection of the tachometer will dam-
age the transistors and diodes inside.

When removing or installing the tachometer, be care-
ful not to drop or subject it to heavy shocks.
(b) Compare the tester and tachometer indications.
DC 13.5 V 25 °C at (77°F)
Standard indicationAllowable range
700630 - 770
1,000900 - 1,100
2,0001,850 - 2,150
3,0002,800 - 3,200
4,0003,800 - 4,200
5,0004,800 - 5,200
6,0005,750 - 6,250
7,0006,700 - 7,300

- BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE-99
1703 Author
: Date
:
2001 AVALON (RM808U)
Within
3 secs.
Turn the ignition switch from ON to LOCK at approx. 1 sec. interval 1 to 5 times to select the mode.
Pull out the key plate from the ignition key cylinder.
When add mode or rewrite mode
is selected.When confirmation
mode is selected.
ON
ONON
LOCK
LOCKLOCK
Approx.
1 sec.Approx.
1 sec. Approx. 1 sec.Approx.
1 sec.Approx.
1 sec.
Add mode
Rewrite modeConfirmation mode
ON - LOCK change occurs 1 time
ON - LOCK change occurs 2 timesON - LOCK change occurs 3 times
MPX body ECU automatically performs
the LOCK-UNLOCK operation once
or twice at 1 sec, interval to inform the
operator that either the add mode or
rewrite mode has been selected.
LOCK-UNLOCK occurs once
LOCK-UNLOCK occurs twice
Indicates that add mode has been selected.
Indicates that rewrite mode has been
selected.
1 sec.
LOCK
1 sec.1 sec.
LOCK
UNLOCK
UNLOCK
LOCK
2 secs.2 secs.
UNLOCK MPX body ECU automatically performs the
LOCK-UNLOCK operation 1 to 4 times at
2 sec. interval to inform the operator of
the number of the registered codes.
HINT:
When the number of the registered code
is 0, the operation is automatically
performed 5 times.
Example:
When the operation is performed twice, it
directs that 2 type of recognition code
have been registered.
1st time 2nd time
Registration of recognition code (Confirmation
mode and probation mode) is completed.
ON
LOCK
Approx.
1 sec.Approx.
1 sec.
Prohibition mode
ON - LOCK change occurs 5 times
When prohibition
mode is selected.

BR2237
BR0KW-04
BR2238
GOODNO GOOD
2nd3rd
1st
- BRAKEBRAKE BOOSTER ASSEMBLY
BR-21
1420 Author
: Date
:
2001 AVALON (RM808U)
BRAKE BOOSTER ASSEMBLY
ON-VEHICLE INSPECTION
1. OPERATING CHECK
(a) Depress the brake pedal several times with the engine off
and check that there is no change in the pedal reserve
distance.
(b) Depress the brake pedal and start the engine. If the pedal
goes down slightly, operation is normal.
2. AIR TIGHTNESS CHECK
(a) Start the engine and stop it after 1 or 2 minutes. Depress
the brake pedal several times slowly.
If the pedal goes down farthest the 1st time, but gradually rises
after the 2nd or 3rd time, the booster is air tight.
(b) Depress the brake pedal while the engine is running, and
stop the engine with the pedal depressed.
If there is no change in the pedal reverse travel after holding the
pedal for 30 seconds, the booster is air tight.

PositionNORMALSHIFT SOLENOID NO.1
MALFUNCTIONING
Solenoid valve
No.1GearSHIFT SOLENOID NO.2
MALFUNCTIONINGBOTH SOLENOIDS MAL-
FUNCTIONINGGear when shift selector is
manually operated
D
2
L
ON
1st 2nd
3rd
O/D
1st 2nd
3rd
1st
2nd1st
X: MalfunctionsNo.2
ONNo.1 No.2
No.1 No.2 Solenoid valveSolenoid valve
GearGear
OFF
OFF
ON ON
OFF
ON
ONOFF
OFF
OFF
OFFON
ON
ON
ON
ONX
3rd
X
X
X
X
X
X
X
XON
ON
ON
ON
ON
ON
ON3rd
3rd
3rd
3rd
3rd O/D
1st
2ndON
ON
ON
ON OFF
OFFOFF
OFF
OFF
OFF
OFFX
X
X
X
X
X
X
X
X1st
O/D
O/D
O/D
O/D
O/D
1st
1stO/D
O/D
O/D
O/D
O/D
O/D
O/D
1st
1st
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-183
339 Author
: Date
:
2001 AVALON (RM808U)
DTC P0753, P0758 Shift Solenoid A/B Electrical Malfunc-
tion (Shift Solenoid Valve No.1/No.2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valves No.1 and
No.2 controlled by ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM con-
trols the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail safe func-
tion).
Fail safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid
valve SL OFF at the same time. If both solenoids are malfunctioning, hydraulic control cannot be performed
electronically and must be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops
sending current to the short circuited solenoid).
HINT:
Check the shift solenoid valve No.1 when DTC P0753 is output and check the shift solenoid valve No.2 when
DTC P0758 is output.
DTC No.DTC Detecting ConditionTrouble Area
P0753
P0758
The ECM checks for an open or short circuit in the shift sole-
noid valve No.1 and/or No.2 circuit when it changes.
The ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected once, but it does not light up MIL.
After ECM detects condition (a) or (b) continuously 8 times or
more in a trip and the MIL lights up.
(a) When the solenoid is energized, the solenoid resistance
is 8 W or less and is counted.
(b) When the solenoid is not energized, the solenoid resistance
is 100 kW or more and is counted.

Open or short in shift solenoid valve No.1/No.2 circuit

Shift solenoid valve No.1/No.2

ECM
DI02L-08

A00310
A09772
Engine Coolant Temp. SensorECM
5 V
THW
E2
E1 14
18 2
1G-Y
W
E5 E5 DI-32
- DIAGNOSTICSENGINE
188 Author
: Date
:
2001 AVALON (RM808U)
DTC P0115 Engine Coolant Temp. Circuit Malfunction
CIRCUIT DESCRIPTION
A thermistor built into the engine coolant temperature sensor changes the resistance value according to the
engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as in the intake air temperature circuit
malfunction shown on page DI-28.
If the ECM detects the DTC P0115, it operates the fail-safe function in which the engine coolant temperature
is assumed to be 80°C (176°C).
DTC No.DTC Detecting ConditionTrouble Area
P0115Open or short in engine coolant temp. sensor circuit

Open or short in engine coolant temp. sensor circuit

Engine coolant temp. sensor

ECM
HINT:
After confirming DTC P0115, use the OBD II scan tool or TOYOTA hand-held tester to confirm the engine
coolant temperature from the CURRENT DATA.
Temperature DisplayedMalfunction
-40°C (-40°F)Open circuit
140°C (284°F) or moreShort circuit
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTCs P0110, P0115, P0120 and P1410 are output simultaneously, E2 (sensor ground) may be open.

Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for
determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel
ratio was lean or rich etc. at the time of the malfunction.
DI07I-09

DI-36
- DIAGNOSTICSENGINE
192 Author
: Date
:
2001 AVALON (RM808U)
DTC P0116 Engine Coolant Temp. Circuit Range/Perfor-
mance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0115 on page DI-32.
DTC No.DTC Detecting ConditionTrouble Area
If THW -7°C (19.4°F), 20 min. or more after starting engine,
engine coolant temp. sensor value is 20°C (68°F) or less (2
trip detection logic)
If THW -7°C (19.4°F), and <10°C (50°F), 5 min. or more
after starting engine, engine coolant temp. sensor value is
20°C (95°F) or less (2 trip detection logic)
If THW 10°C (50°F), 2 min. or more after starting engine,
engine coolant temp. sensor value is 30°C (86°F) or less (2
trip detection logic)

Cooling systemP0116When THW
35°C (95°F) or more and less than 60°C
(140°F), and THA
- 6.7°C (19.9°F) or more, when starting
engine, conditions (a) and (b) continue: (2 trip detection logic)
(a) Vehicle speed is changing (Not stable)
(b) THW change is lower than 3°C (5.4°F) from THW since
when starting engine
Cooling system

Engine coolant temp. sensor
In case that reading value of water temp. sensor will not
change more than 1°C (1.8°F) even after repeating 6 trips
(detection logic) of adjusting speed pattern with THW more
than 60°C (140°F) when engine starts.
INSPECTION PROCEDURE
HINT:

If DTCs P0115 and P0116 are output simultaneously, engine coolant temperature sensor circuit may
be open. Perform troubleshooting of DTC P0115 first.

Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for
determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel
ratio was lean or rich, etc. at the time of the malfunction.
1 Are there any other codes (besides DTC P0116) being output?
YES Go to relevant DTC chart (See page DI-14).
NO
2 Check thermostat (See page CO-1 1).
NG Replace thermostat.
DI07J-09

A00477
Atmosphere
Cover
Exhaust GasPlatinum
Electrode
Solid Electrolyte
(Zirconia Element)
Platinum
Electrode
Heater
A/F Sensor Voltage
Air-Fuel Ratio
(V)
2.6 4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.4
12 13 14 15 16 17 18
Coating (Ceramic)
ECM Monitored
19
Housing
- DIAGNOSTICSENGINE
DI-43
199 Author
: Date
:
2001 AVALON (RM808U)
DTC P0125 Insufficient Coolant Temp. for Closed Loop
Fuel Control
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three-way cata-
lytic converter is used, but for the most efficient use of the three-way catalytic converter, the air-fuel ratio
must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.
The A/F sensor has the characteristic that provides output voltage* approximately proportional to the exist-
ing air-fuel ratio. The A/F sensor output voltage* is used to provide feedback for the ECM to control the air-
fuel ratio.
By the A/F sensor output, the ECM can determine the deviation amount from the stoichiometric air-fuel ratio
and control the proper injection time immediately. If the A/F sensor is malfunctioning, ECM is unable to per-
form accurate air-fuel ratio control.
The A/F sensor is equipped with a heater which heats the zirconia element. The heater is controlled by the
ECM. When the intake air volume is low (the temp. of the exhaust gas is low), current flows to the heater
to heat the sensor for accurate oxygen concentration detection.
*: The voltage value changes at the inside of the ECM only.
DTC No.DTC Detecting ConditionTrouble Area
P0125
After engine is warmed up, A/F sensor output* does not
change when conditions (a), (b), (c) and (d) continue for at
least 1.5 min:
*: Output value changes at inside of the ECM only
(a) Engine speed: 1,500 rpm or more
(b) Vehicle speed: 40 - 100 km/h (25 - 62 mph)
(c) Throttle valve is not fully closed
(d) 140 sec. or more after starting engine
Open or short in A/F sensor (bank 1, 2 sensor 1) circuit

A/F sensor (bank 1, 2 sensor 1)

Air inducation system

Fuel pressure

Injector

Gas leakage on exhaust sytem

ECM
HINT:

After confirming DTC P0125, use the OBD II scan tool or TOYOTA hand-held tester to confirm voltage
output of the A/F sensor (bank 1, 2 sensor 1) from the CURRENT DATA.

The ECM controls the voltage of the AFR+, AFL+, AFR- and AFL- terminals of the ECM to the fixed
voltage. Therefore, it is impossible to confirm the A/F sensor output voltage without the OBDII scan
tool or TOYOTA hand-held tester.
DI07M-14