2001 TOYOTA AVALON Service Repair Manual

I13679
I13679
DI-554
- DIAGNOSTICSCRUISE CONTROL SYSTEM
710 Author
: Date
:
2001 AVALON (RM808U)
(d) Inspect the CANCEL switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) When operating one of the following operations,
check that the cruise control system is cancelled
and that the normal driving mode is reset.

Depress the brake pedal

Shift to except D position

Push the main switch OFF

Push the cruise control switch to CANCEL
(e) Inspect the RESUME switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) When operating one of the following operations
check that the cruise control system is cancelled
and that the normal driving mode is reset.

Depress the brake pedal

Shift to except D position

Push the main switch OFF

Push the cruise control switch to CANCEL
(4) After the control switch is pushed to RES/ACC at
the driving speed of more than 40 km/h (25 mph),
check that the vehicle restores the speed prior to
the cancellation.

I13679
(a)
(a)(b)
No.Operation MethodCRUISE MAIN Indicator Light
Blinking PatternDiagnosis
1 Push SET/COAST switch ON
2Push RES/ACC switch ON
3Push CANCEL switch ON
Turn stop light switch ON
Depress brake pedal
Turn PNP switch OFF
(Shift to except D position)
4Drive at about 40 km/h
(25 mph)or higher
Drive at about 40 km/h
(25 mph) or below
LightON
OFF
LightON
OFF
LightON
OFFSwitch ON
Switch OFF
LightON
OFFSwitch OFF
Switch ONSET/COAST switch circuit
is normal
RES/ACC switch circuit
is normal
CANCEL switch circuit
is normal
Stop light switch circuit
is normal
PNP switch circuit is
normal
Vehicle Speed Sensor is
normal
LightON
OFF LightON
OFF
1sec.
0.25 sec.0.25 sec.
Turn clutch switch OFF
(Depress clutch pedal)Clutch switch circuit
is normal
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-555
711 Author
: Date
:
2001 AVALON (RM808U)
5. INPUT SIGNAL CHECK
HINT:
(1) For check No.1 ~ No.3:
Turn ignition switch ON.
(2) For check No.4:

Jack up the vehicle.

Start the engine.

Shift to D position.
(a) Push the control switch to SET/COAST or RES/ACC posi-
tion and hold it down or up.
(b) Push the main switch ON.
(c) Check that the CRUISE MAIN indicator light blinks twice
or 3 times repeatedly after 3 seconds.
(d) Push the SET/COAST or RES/ACC switch OFF.
(e) Operate each switch as listed in the table below.
(f) Read the blinking pattern of the CRUISE MAIN indicator
light.
(g) After performing the check, turn the main switch OFF.
HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed 1st.

DI08L-15
DI-560
- DIAGNOSTICSCRUISE CONTROL SYSTEM
716 Author
: Date
:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSuspect AreaSee page
SET not occourring or CANCEL occurring.
(DTC is Normal)
1. Vehicle Speed Sensor
2. Control Switch Circuit (Cruise control switch)
3. Stop Light Switch Circuit
4. Park/Neutral Position Switch Circuit
5. Actuator Motor Circuit
6. Cruise Control Cable
7. Cruise Control ECUDI-568
DI-572
DI-578
DI-584
DI-561
DI-596
IN-30
SET not occurring or CANCEL occurring.
(DTC dose not output)1. ECU Power Source Circuit
2. Cruise Control ECUDI-587
IN-30
Actual vehicle speed deviates above or below the set speed.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Electronically Controlled Transmission
Communication Circuit
4. Actuator Motor Circuit
5. Idle Signal Circuit (Main throttle position sensor)
6. Cruise Control ECUDI-596
DI-568
DI-581
DI-581
DI-561
DI-575
IN-30
Gear shifting frequent between 3rd O/D when driving on uphill
road. (Hurting)1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECUDI-581
DI-581
IN-30
Cruise control not cancelled, even when brake pedal is de-
pressed.
1. Cruise Control Cable
2. Stop Light Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-578
DI-561
IN-30
Cruise control not cancelled, even when transmission is shifted to
ºNº postion.
1. Cruise Control Cable
2. Park/Neutral Position Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-584
DI-561
IN-30
Control switch does not operate.
(SET/COAST, ACC/RES, CANCEL not possible)
1. Cruise Control Cable
2. Control Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-572
DI-561
IN-30
SET possible at 40 km/h (25 mph) or less, or CANCEL does not
operate at 40 km/h (25 mph) or less.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-568
DI-561
IN-30
Poor response is in ACCEL and RESUME modes.
1. Cruise Control Cable
2. Electronically Controlled Transmission
Communication Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-581
DI-581
DI-561
IN-30
O/D does not resume, even though the road is not uphill.
1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECUDI-581
DI-581
IN-30
DTC memory is erased.1. Cruise Control ECUIN-30
DTC is not output, or is output when should not be.1. Diagnosis Circuit
2. Cruise Control ECUDI-594
IN-30
Cruise MAIN indicator light remains ON or falls to light up.1. Cruise MAIN Indicator Light Switch CircuitDI-592

DI1KT-08
I00293
C15
DI-558
- DIAGNOSTICSCRUISE CONTROL SYSTEM
714 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
STP e GND GWWBDepress brake pedal10 - 16 VSTP e GND
(C15-2 e C15-16)G-W e W-BRelease brake pedalBelow 1 V
D e GND YRWBShift to positions except DBelow 1 VD e GND
(C15-3 e C15-16)Y-R e W-BShift to D position10 - 16 V
PI e GND GR RWB
Ignition switch ON
Cruise control main switch ONBelow 1.2 VPI e GND
(C15-4 e C15-16)GR-R e W-BIgnition switch ON
Cruise control main switch OFF10 - 16 V
TCGNDIgnition switch ON10 - 16 VTC e GND
(C15-5 e C15-16)LG-R e W-BIgnition switch ON
Connect terminals Tc and E1 of diagnostic check connectorBelow 1 V
ECT e GND GYWB
During driving
Gear position 3rd10 - 16 VECT e GND
(C15-6 e C15-16)G-Y e W-BDuring driving
Gear position O/DBelow 1 V
MC e GND RWB
During cruise control driving
COAST switch held ON9 - 15 VMC e GND
(C15-7 e C15-16)R e W-BDuring cruise control driving
ACC switch held ONBelow 1 V
L e GND GBWBDuring cruise control driving9 - 15 VL e GND
(C15-8 e C15-16)G-B e W-BExcept during cruise control drivingBelow 1 V
B e GND
(C15-9 e C15-16)Y-R e W-BIgnition switch ON10 - 16 V
Ignition switch ON10 - 16 V
CCSGND
Ignition switch ON
MAIN switch held ONBelow 1 V
CCS e GND
(C15-10 e C15-16)W e W-BIgnition switch ON
SET/COAST switch held ON4.7 - 7.7 V
Ignition switch ON
RES/ACC switch held ON2.6 - 4.2 V

- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-559
715 Author
: Date
:
2001 AVALON (RM808U) CAN e GND
WLWB
Ignition switch ON
Cancel switch OFF10 - 16 VCAN e GND
(C15-1 e C15-16)W-L e W-BIgnition switch ON
Cancel switch ONBelow 1 V
SPD e GND
(C15 12C15 16)V-W e W-B
Engine start
Car stoppage.Below 1.5 V or
4.7 - 16 V
(C15-12 e C15-16)VW e WB
During driving (Pulse generated).3 - 7 V
IDL e GND YWB
Ignition switch ON
Throttle valve fully opened.10 - 16 VIDL e GND
(C15-13 e C15-16)Y e W-BIgnition switch ON
Throttle valve fully closed.Below 1.5 V
OD e GNDGRWB
During cruise control driving
OD switch ON.10 - 16 VOD e GND
(C15-14 e C15-16)GR e W-BDuring cruise control driving
OD switch OFF (3rd driving)Below 1 V
MO e GND PWB
During cruise control driving
ACC switch hold ON9 - 15 VMO e GND
(C15-15 e C15-16)P e W-BDuring cruise control driving
COAST switch hold ONBelow 1 V
GND e Body Ground
(C15-16 e Body Ground)W-B e Body
GroundConstantBelow 1 V

A11671
IG SwitchDriver Side J/B
W-R
B-O
W-R 712
1C
IF1 7 61B
2C
2B 2F 2GAM2
213
5
EFI
No.1EFI Relay
B
1
1F7
F6Fusible
Link
Block
FL
Main
BatteryECM
17 16
E5
AA J7 J/C
E1 BR+B Engine Room J/B
ECL-OE82
8IGSW
MRELB+ E8
E8
4B-W B-WIF1
6
L-O17
II14
2
2F
EFI
No.2
EB B-O
W-B
EDA 2
4
BR 7
BR DI-148
- DIAGNOSTICSENGINE
304 Author
: Date
:
2001 AVALON (RM808U)
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to terminal IGSW of the ECM and
the EFI main relay (Marking: EFI) control circuit in the ECM sends a signal to terminal MREL of the ECM
switching on the EFI main relay.
This signal causes current to flow to the coil, closing the contacts of the EFI main relay and supplying power
to terminal +B of the ECM.
If the ignition switch is turned off, the ECM continues to switch on the EFI main relay for a maximum of 2
seconds for the initial setting of the IAC valve.
WIRING DIAGRAM
DI6TD-01