2001 TOYOTA AVALON Service Repair Manual

- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-205
361 Author
: Date
:
2001 AVALON (RM808U)
3 Check harness and connector between cruise control ECU and ECM
(See page IN-30).
NG Repair or replace the harness or connector.
OK
Check and replace the ECM
(See page IN-30).

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

- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-207
363 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check operation of O/D main switch.
PREPARATION:
Turn the ignition switch ON.
CHECK:
(a) Check O/D OFF indicator light when O/D main switch is
pushed in to ON.
(b) Check O/D OFF indicator light when O/D main switch is
pushed again.
OK:
(a) O/D OFF indicator light lights up.
(b) O/D OFF indicator light goes off.
OK Proceed to next inspection shown on symp-
toms problem tables (See page DI-175).
NG
2 Check and replace the combination meter (See page BE-2).
NG Replace the combination meter.
OK

Q07595
2
4
D06554
ON
ODMS
DI-208
- DIAGNOSTICSAUTOMATIC TRANSAXLE
364 Author
: Date
:
2001 AVALON (RM808U)
3 Check O/D main switch.
PREPARATION:
Disconnect the O/D main switch connector.
CHECK:
(a) Floor shift:
Check continuity between terminals 2 and 4 of O/D main
switch connector.
(b) Column shift:
Check continuity between terminals 1 and 3 of O/D main
switch connector.
OK:
O/D main switch conditionSpecified condition
Press continuously O/D main switchContinuously
Release O/D main switchNo continuously
NG Replace and repair O/D main switch.
OK
4 Check voltage between terminal ODMS of ECM and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check voltage between terminal ODMS of ECM and body
ground when O/D main switch is ON and OFF.
OK:
O/D main switch conditionSpecified condition
Press continuously O/D main switchBelow 1.0 V
Release O/D main switch10 - 14 V
OK Check and replace the ECM (See page IN-30).
NG

D06553
ON
ODLP
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-209
365 Author
: Date
:
2001 AVALON (RM808U)
5 Check voltage between terminal ODLP of ECM and body ground.
PREPARATION:
(a) Disconnect the connector of ECM.
(b) Turn the ignition switch ON.
CHECK:
Check voltage between terminal ODLP of ECM and body
ground.
OK:
Voltage: 7.5 - 14 V
OK Check and replace the ECM (See page IN-30).
NG
Check and replace harness and connector between combination meter and ECM, O/D main
switch and ECM, O/D main switch and body ground. (See page IN-30).

DI4DO-02
A00022
4-pulse
Combination
MeterECM 4-pulse
From
Speed SensorABS ECU DI-178
- DIAGNOSTICSAUTOMATIC TRANSAXLE
334 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC P0500 Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
The speed sensor for ABS detects the wheel speed and sends the appropriate signals to the ABS ECU.
The ECU converts these signals in to a 4-pulse signal and outputs it to the combination meter.
After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit in-
side the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based
on the frequency of these pulse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
Satisfying all of the following conditions, 2 sec. (Intake air tem-
perature: -10 °C or more) or 8 sec. (Intake air temperature:
less than -10 °C) elapsed.
(c) After 2 sec. (the engine coolant temperature: 20 °C or
more) or 30 sec. (the engine coolant temperature: less than
20 °C) with the park/neutral position switch set to P, N posi-
tion.
(d) No abnormality of the throttle position sensor is detected.
(e) After 0.5 sec. or more with the ignition switch turned ON.
(f) No vehicle speed is signal to ECM.
(g) The engine rpm is equal to the speed sensor rpm or more
when the throttle opening angle is as shown below.
1. The throttle opening angle is less than 13° and the engine
rpm is 2,350 or more.
2. The throttle opening angle is less than 21° and the engine
rpm is 2,680 or more.
3. The throttle opening angle is less than 30° and the engine
rpm is 2,835 or more.
4. The throttle opening angle is less than 30° and the engine
rpm is 3,145 or more.

Open or short in vehicle speed sensor circuit

ABS speed sensor

Combination meter

ECM

ABS ECU

Automatic transaxle (clutch, brake or gear etc.)
Clutch or brake slips or gear is broken (2-trip detection logic)

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.

BE6653D01908D07204
ON
SPD
(-)
(+)
DI-180
- DIAGNOSTICSAUTOMATIC TRANSAXLE
336 Author
: Date
:
2001 AVALON (RM808U)
OK
3 Check voltage between terminal SPD of ECM connector and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal SPD of ECM connector and
body ground.
OK:
Voltage: 9 - 14 V
NG Check for open in harness and connector be-
tween J/B No. 3 and ECM (See page IN-30).
OK
4 Check for open in harness and connector between J/B No. 3 and combination
meter (See page IN-30).
NG Repair or replace harness or connector.
OK
5 Check ECM (See page IN-30).
NG Replace ECM.
OK
Check and repair the transaxle (clutch, brake
or gear etc.).