2001 TOYOTA AVALON Wiring diagram

I13609
Cruise Control ECU
4
PI
5
TC GR-R 10
4 DLC2
22 DLC1
II23B
LG-R A/D
Tc
Tc13
LG-R3A 13
3G 4 4A17
4B17
GR-R
LG-R
4H6
4A6
LG-R LG-R11D2
D1
C15
J/B No. 4
J/B No. 3
J/B No. 4 DI-594
- DIAGNOSTICSCRUISE CONTROL SYSTEM
750 Author
: Date
:
2001 AVALON (RM808U)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that outputs DTC.
WIRING DIAGRAM
DI091-15

I13611
Cruise Control ECU
9
B
Y-R
IG B 3 1
4IG1 RELAY
2
AM1 ECU-IG NO. 2
5 5
B-L
ALT FL Block
F6
B
FL MAIN
BatteryW-BW-B 1
2G
F8
W-B AA
J5
J/C 1 F101 1
1G
3
1B
1
2H13
1B
4
1C2
3C2
3D
7
IF1
7
3A20
3BGND
1W-B16 W-B WY-R
W-R42
I15Ignition Switch
C15
W-L
W-L
B-LIG1 AM1
2
1J/B No. 3
Driver Side J/B
Engine Room J/B
Engine Room R/B No. 5
J/B No. 3
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-587
743 Author
: Date
:
2001 AVALON (RM808U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc, when terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI08X-15

I13613
Cruise Control ECU
14
OD
6
ECT
G-Y
S2ECT No.2 SolenoidII221
B
6 ECM
GR OD1
S2E7
E6 24
1
G-Y G-YB
B
E1
C15
J8
J/C
G-Y
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-581
737 Author
: Date
:
2001 AVALON (RM808U)
Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTION
When driving uphill under the cruise control, in order to reduce shifting due to ON-OFF overdrive operation
and to provide smooth driving, when down shifting in the electronically controlled transmission occurs, a sig-
nal to prevent upshift until the end of the uphill slope is sent from the cruise control ECU to the electronically
controlled transmission.
Terminal ECT of the cruise control ECU detects the shift change signal (output to electronically controlled
transmission No. 2 solenoid) from the ECM.
If the vehicle speeds down, also when terminal ECT of the cruise control ECU receives down shifting signal,
it sends a signal from terminal OD to ECM to cut overdrive until the end of the uphill slope, and the gear shifts
are reduced and gear shift points in the electronically controlled transmission are changed.
WIRING DIAGRAM
DI08U-13

I17550
Cruise Control ECU
D 3
W-B 2
Ignition Switch1 II1
1G
3
4 4
2 1C
1
F10
1
ALT FL Block
1
FL MAINBattery IG1AM1CCS
F6 F8W-L26
1 20
AM1 Y-RY-R
R-L
R-LR-L
R-Y23
3D20
3C20
3C7
R-LY-R 4C6
4C19
II14
10 DL 2
W-R W
4
27
IF15
5 2
1
1 1
2H
2G
B-L1C1
1B3
IG B IG1 Relay
GAUGE NO. 2 A/T Indicator Light
Translate ECU
*1: w/ Traction Control
*2: w/o Tranction Control*1*2
T5
P1C15
I15
W-L
D6
DiodeY-R
*3: Floor Shift
*4: Column ShiftJ/B No. 4
J/B No. 3
*4
*3
Driver Side J/B
Engine Room R/B No. 5
BEngine Room J/B DI-584
- DIAGNOSTICSCRUISE CONTROL SYSTEM
740 Author
: Date
:
2001 AVALON (RM808U)
Park/Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is except D, a signal is sent from the park/neutral position switch to the ECU. When
this signal is input during cruise control driving, the ECU cancels the cruise control.
WIRING DIAGRAM
DI08V-15

I13608
Cruise Control ECU
2
STP
G-W
R3
3C 1B
1
4Stop Light Switch
2
95
FL BlockC15
C15 3
II1
BatterySTOP
W
B 1D33
3D
P-B
W-B
IJ AJ9 J/C W-BP-BG-B8
L F61
F101
ALT
FL MAIN1D11
1G1
II1 13
43
C4
Cruise Control Actuator
S4 Stop Light Switch
S4J/B No. 3
Driver Side J/B Driver Side J/B
G-W
G-W DI-578
- DIAGNOSTICSCRUISE CONTROL SYSTEM
734 Author
: Date
:
2001 AVALON (RM808U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECU. When the ECU receives
this signal, it cancels the cruise control.
A fail-safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP-
When the brake is ON, battery positive voltage normally is applied through the STOP fuse and stop light
switch to terminal STP- of the ECU, and the ECU turns the cruise control OFF.
If the harness connected to terminal STP- has an open circuit, terminal STP- will have battery positive volt-
age and the cruise control will be turned OFF.
Also, when the brake is ON, the magnetic clutch circuit is cut mechanically by the stop light switch, turning
the cruise control OFF. (See page DI-563 for operation of the magnetic clutch)
WIRING DIAGRAM
DI08T-17

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

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

A06092
1
3
5
24
6 IACV No.2IACV No.1, No.2 closed (VSV: OFF)
Throttle Valve30°
3,700 rpm
Engine Speed
Throttle Valve
Opening Angle
FI7011 FI6570
IACV No.1
2,700 rpmIACV No.1 open (VSV: ON)
IACV No.2 closed (VSV: OFF)
IACV No.1, No.2 open (VSV: ON)
A11667
From BatteryEngine Room J/B
2B 2G
2F
2B
2
4
1 EFI
No.1EFI Relay
W-B
B-W 9
E01ACISE4 R-Y
2 VSV for ACIS No.1
ED17
L-O B
4 EFI
No.21
2
From
Terminal
MREL of
ECME01
ACI1E5 15
B-W B-WECM
VSV for ACIS No.2W-R 1 2
53
- DIAGNOSTICSENGINE
DI-145
301 Author
: Date
:
2001 AVALON (RM808U)
IACV Control Circuit
CIRCUIT DESCRIPTION
This circuit opens and closes the IACV (Intake Air Control Valve) in response to the engine load in order to
increase the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is 3,700 rpm or less and the throttle valve opening angle is 30° or more, the ECM
turns the two VSV ON or OFF and operate the IACV.
WIRING DIAGRAM
DI08E-09