TOYOTA AVALON 2001 Service Repair Manual

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

A02040
ON
E1+B
(-) (+)
A02344
ON
IGSW
(-) (+)
- DIAGNOSTICSENGINE
DI-149
305 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals +B and E1 of ECM connectors.
PREPARATION:
(a) Remove the glove compartment (See page SF-82).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals +B and E1 of the ECM
connectors.
OK:
Voltage: 9 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-22).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN-30).
NG Repair or replace harness or connector.
OK
3 Check voltage between terminal IGSW of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See page SF-82).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal IGSW of the ECM con-
nector and body ground.
OK:
Voltage: 9 - 14 V
OK Go to step 5.
NG

A02345
ON
MREL
(-) (+)
DI-150
- DIAGNOSTICSENGINE
306 Author
: Date
:
2001 AVALON (RM808U)
4 Check AM2 fuse (See page DI-1 17, step 10).
NG Check for short in all harness and components
connected to AM2 fuse.
OK
5 Check ignition switch (See page BE-16).
NG Replace ignition switch.
OK
Check and repair harness and connector be-
tween battery and ignition switch, and igni-
tion switch and ECM.
6 Check voltage between terminal MREL of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See page SF-82).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal MREL of the ECM con-
nector and body ground.
OK:
Voltage: 9 - 14 V
NG Check and replace ECM (See page IN-30).
OK
7 Check EFI No.1 fuse (See page DI-136, step 2).
NG Check for short in all harness and components
connected to EFI No.1 fuse.

A11423
Engine Room J/B
EFI No.2
Fuse
- DIAGNOSTICSENGINE
DI-151
307 Author
: Date
:
2001 AVALON (RM808U)
OK
8 Check EFI No.2 fuse.
PREPARATION:
Remove the EFI No.2 fuse from the engine room J/B.
CHECK:
Check the continuity of the EFI No.2 fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to EFI No.2 fuse.
OK
9 Check EFI main relay (Marking: EFI) (See page SF-60).
NG Replace EFI main relay.
OK
10 Check for open and short in harness and connector between terminal MREL of
ECM and body ground (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and repair harness or connector be-
tween EFI No.1 fuse and battery.

A11425
EFI No.1
FL
MainIG Switch
AM2
BatteryEFI Relay
C/OPN Relay
Fuel Pump
ST
RelayStarter Park/ Neutral
Position SwitchECM
FC
Tr
STA
NE (STA Signal)
(NE Signal) MAINMREL
IGSW
ST DI-152
- DIAGNOSTICSENGINE
308 Author
: Date
:
2001 AVALON (RM808U)
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay (Marking: ST) coil and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit
opening relay (Marking: C/OPN), the relay switches on, power is supplied to the fuel pump and the fuel pump
operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
DI6TE-01

A11672
From
Terminal
MREL of
ECM From
Battery1 5
2 B-R3
C/OPN Relay Driver Side R/B No.6
6
66 6 B-R 1
IF1 W-R
W-B
2C
2F13
EFI
No.1 AM2
EFI Relay 5
1B
EDEngine Room J/B
43
22B
1 2G
46 7
2C 2
BK 7 4
IF1ECM
E01
ID2E8
Fuel
Pump
AL-B
W-BJ11
J/CFC
G-B3
5 41
L-B B-O IG SwitchW-B
W-R
L-O
BE6653A02330
A02405
ON
- DIAGNOSTICSENGINE
DI-153
309 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM
INSPECTION PROCEDURE
TOYOTA hand-held tester:
1 Connect TOYOTA hand-held tester, and check operation of fuel pump.
PREPARATION:1
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-
held tester main switch ON.
(c) Use the ACTIVE TEST mode to operate the fuel pump.
CHECK:
Check that the pulsation damper screw rises up when the fuel
pump is operated by the TOYOTA hand-held tester.
OK:
The pulsation damper screw rises up.
OK Check for starter signal circuit
(See page DI-142).
NG

A02064
ON
FC
(+) (-)
DI-154
- DIAGNOSTICSENGINE
310 Author
: Date
:
2001 AVALON (RM808U)
2 Check for ECM power source circuit (See page DI-148).
NG Repair or replace.
OK
3 Check circuit opening relay (Marking: C/OPN) (See page SF-63).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See page SF-83).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal FC of the ECM connec-
tor and body ground.
OK:
Voltage: 9 - 14 V
OK Go to step 5.
NG
Check for open in harness and connector between EFI main relay (Marking: EFI) and circuit open-
ing relay (Marking: C/OPN), and circuit opening relay and ECM (See page IN-30).
5 Check fuel pump (See page SF-6).
NG Repair or replace fuel pump.