2001 TOYOTA AVALON Wiring diagram

D07905
C15 E7 Cruise Control ECU
14
ODGR24
OD1ECM
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-203
359 Author
: Date
:
2001 AVALON (RM808U)
O/D Cancel Signal Circuit
CIRCUIT DESCRIPTION
While driving uphill with cruise control activated, in order to minimize gear shifting and provide smooth cruis-
ing overdrive may be prohibited temporarily under some condition.
The cruise control ECU sends O/D cut signals to the ECM as necessary and the ECM cancels overdrive
shifting until these signals are discontinued.
WIRING DIAGRAM
DI02S-08

D07910
C9
O/D OFF
Indicator Light
15
7
G-O163G 3AG-O9
E8ECM
ODLP
2
3F Y-G2
3CY-R13
1B
ECU-IG
No. 2211
1GW
W-B3
1B
4
IG1 RELAY34
1CW-R
I15 Ignition Switch
24
AM1 IG1 W-L 7
IF1 W-L
5 2 AM1
1
5 B
1
2H
12G
B-L
1
F8 F101
ALTF6BFL MAINBattery
IJ W-B 7
7
4A
W-B
O34
*12*1
O3
3
*2G-O
12
E6ODMS
*1: Floor Shift*2: Column Shift1
*2 16
W
O/D Main
Switch IG
Driver Side J/B
Engine Room R/B No. 5
Engine
Room
J/B
A 8
II2
G-O
J9 J/ C 4BJ/B No. 4 J/B No. 3
1 DI-206
- DIAGNOSTICSAUTOMATIC TRANSAXLE
362 Author
: Date
:
2001 AVALON (RM808U)
O/D Main Switch & O/D OFF Indictor Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch is a momentary type switch. When pressing the O/D OFF main switch, the O/D OFF
indicator light lights up and ECM prohibits shifting to O/D, and when pressing it again, the O/D OFF indicator
light goes off and ECM allows shifting to O/D. Turning the IG switch OFF will reset the O/D OFF indicator
light.
WIRING DIAGRAM
DI1KD-08

D07904
18
M3V-W22 Combination
Meter
1
3F1
3C E7ECM
SPD V-W J/B No. 3
A02373
SPD
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-179
335 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of speedometer.
CHECK:
Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.
NG Check speedometer circuit.
OK
2 Check for short in harness and connector between terminal SPD of ECM and
body ground.
PREPARATION:
(a) Remove the glove compartment (See page BO-90).
(b) Disconnect the connector from ECM.
CHECK:
Check continuity between terminal SPD of ECM and body
ground.
OK:
No continuity
NG Repair or replace harness or connector.

D07908
Transaxle
Shift Solenoid Valve No.1
3
6 S1
Shift Solenoid
Valve No.2S2G-YE47
1
E6ECM
S1
S2 P
G-Y
B
BB J8
J/C
From Cruise Control ECU DI-184
- DIAGNOSTICSAUTOMATIC TRANSAXLE
340 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM

D07906
E6 Transaxle
Shift Solenoid
Valve SL
2
SLG-W15
SLECM E1
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-189
345 Author
: Date
:
2001 AVALON (RM808U)
DTC P0773 Shift Solenoid E Electrical Malfunction
(Shift Solenoid Valve SL)
CIRCUIT DESCRIPTION
The shift solenoid valve SL is turned ON and OFF by signals from the ECM to control the hydraulic pressure
acting on the lock-up relay valve, which then controls operation of the lock-up clutch.
Fail safe function:
If the ECM detects a malfunction, it turns the shift solenoid valve SL OFF.
DTC No.DTC Detecting ConditionTrouble Area
P0773
Either (a) or (b) is detected for 1 time.
(2-trip detection logic)
(a) Solenoid resistance is 8 W or less short when solenoid is
energized.
(b) Solenoid resistance is 100 kW or more when solenoid is not
energized.

Open or short in shift solenoid valve SL circuit

Shift solenoid valve SL

ECM
WIRING DIAGRAM
DI02N-08

DI-192
- DIAGNOSTICSAUTOMATIC TRANSAXLE
348 Author
: Date
:
2001 AVALON (RM808U)
DTC P1520 Stop Light Switch Signal Malfunction
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while driving in lock-up condition, when
brakes are suddenly applied.
When the brake pedal is operated, this switch sends a signal to ECM. Then the ECM cancels operation of
the lock-up clutch while braking is in progress.
DTC No.DTC Detecting ConditionTrouble Area
P1520No stop light switch signal to ECM during driving.
(2-trip detection logic)
Open or short in stop light switch circuit

Stop light switch

ECM
WIRING DIAGRAM
See page DI-134.
INSPECTION PROCEDURE
See page DI-134.
DI02O-06

Q04869
NC2 Revolution Sensor
D07907
E4
E4 1O1 2
G R
Direct Clutch
Speed Sensor24
NC2+
ECM
NC2
-
23
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-193
349 Author
: Date
:
2001 AVALON (RM808U)
DTC P1705 NC2 Revolution Sensor Circuit Malfunction
(Direct Clutch Speed Sensor)
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the direct clutch drum.
By comparing the direct clutch speed signal with the vehicle
speed sensor signal, the ECM detects the shift timing of the
gears and appropriately controls the engine torque and hydrau-
lic pressure in response to various conditions, thus performing
smooth gear shifting.
DTC No.DTC Detecting ConditionTrouble Area
P1705
The ECM detects conditions (a), (b), (c), (d), (e) and (f) conti-
nuity for 4 secs. or more.
(2-trip detection logic)
(a) Gear change not being performed
(b) Gear position: 1st, 2nd 3rd or O/D
(c) T/M input shaft rpm: 300 rpm or less
(d) T/M output shaft rpm: 1,000 rpm or more
(e) Park/neutral position switch: OFF
(f) Shift solenoid valves No. 1, No. 2, SL and vehicle speed
sensor are in normal operation.

Open or short in direct clutch speed sensor circuit

Direct clutch speed sensor

ECM
WIRING DIAGRAM
DI02P-07

D07911
Y P-L
SLN-
E4 E1
E4ECM
20
SLN+
19 Shift Solenoid
Valve SLN
4 1 Transaxle DI-196
- DIAGNOSTICSAUTOMATIC TRANSAXLE
352 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM