2001 TOYOTA AVALON Service Repair Manual

D04720
(+)
(-)21
1 2
D00051
(+)
(-)2
1
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-197
353 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check shift solenoid valve SLN.
Check solenoid resistance and operation:
PREPARATION:
Disconnect the shift solenoid valve SLN connector.
CHECK:
(a) Measure resistance between terminals 1 and 2 of sole-
noid connector.
(b) Connect positive
lead with an 8 - 10 W bulb to terminal
1 of solenoid connector and negative lead to terminal
2, then check the movement of the valve.
OK:
(a) Resistance: 5.1 - 5.5 W
(b)
When battery positive voltage is sup-
plied.Valve moves in direction shown in il-
lustration. (on the left)
When battery positive voltage is cut off.Valve moves in direction shown in il-
lustration. (on the right)
Check solenoid operation:
PREPARATION:
Connect positive
lead of the variable power supply to termi-
nal 1 of solenoid connector and negative lead to terminal 2.
CHECK:
(a) Check the movement of the valve when the voltage is
gradually increased.
(A current greater than 1A should not be supplied.)
(b) Check the movement of the valve when the voltage is cut
off.
OK:
(a) As the voltage is increased, the valve should move
slowly in the
direction.
(b) The valve should return in the
direction.
NG Replace the shift solenoid valve SLN.
OK

DI-198
- DIAGNOSTICSAUTOMATIC TRANSAXLE
354 Author
: Date
:
2001 AVALON (RM808U)
2 Check harness and connector between battery and shift solenoid valve SLN,
shift solenoid valve SLN and ECM (See page IN-30).
NG Repair or replace the harness or connector.
OK
Check and replace the ECM (See page
IN-30).

- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-199
355 Author
: Date
:
2001 AVALON (RM808U)
DTC P1780 Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park/neutral position switch detects the shift lever position and sends signals to the ECM.
The ECM receives signals (NSW, R, 2 and L) from the park/neutral position switch. When the signal is not
sent to the ECM from the park/neutral position switch, the ECM judges that the shift lever is in D position.
DTC No.DTC Detection ConditionTrouble Area
P1780
When driving under conditions (a) and (b) for 30 seconds or
more, the park/neutral position switch is ON (N position).
(2-trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500 - 2,500 rpm

Short in park/neutral position switch circuit

Park/neutral position switch

ECM
DI6K8-01

D07909
J5 J/C
A
A77
3A 3GW-B
P1
Park/Neutral
Position switch
W-B
2RL
2L
LLR-B
8
G-Y
3
Y
41
II1
2
II2
II2R-B
G-Y
Y18
3C
3C
3B
7
3C 3C
3D
3D 3C
GR *2
R-L
W-B20
20
15 15
FUSIBLE LINK
BLOCK
IG8
1D
1C
1B 1
1
3C9
Combination Meter
R2L
R-B G-Y
Y 25 6
16
1718 16 17
3F 3F 3G
3D
3A 3D18
16
17R-B
G-Y
Y
R-L
*1
R-L
*2
GR
*22
4D 4C11DIODE D6
3
2
1
GR
*2
ECU-ACC
GAUGE No. 2
2
410
1C
1G
1C1
4 1
3
F10
F8
F7
F6 11
1
1B-L
B2G
2G2H
2C 11
27AM2
BFL MAINBatteryB
5
1AM1
25
W-RW-L7
IF1
W-R W-L W-R W-G
4 3
IG1ACC ST2AM2
8 B-W R-L2020
E7 18
7
6R-B
G-Y
YE6
E6
E6R
2
LECM
NSW
I15
Ignition Switch
7
2 8
14
13
IG1 RELAY R-L
W
4 W-BJ/B No. 3
21
II2
II2
II2
J/B No. 3
J/B No. 3
J/B No. 4II1
Driver Side J/B
ALTEngine Room J/B Engine Room R/B No. 5
IF1 W-B*2
*1: Floor Shift
*2: Column ShiftAM1 DI-200
- DIAGNOSTICSAUTOMATIC TRANSAXLE
356 Author
: Date
:
2001 AVALON (RM808U)
WIRING DIAGRAM

D06555
L R
2NSW
Position
P, N
R
D
2
LNSW-Body
groundR-Body
ground2-Body
groundL-Body
ground
0 V 0 V
0 V
0 V
0 V0 V
0 V
0 V0 V
0 V
0 V
0 V
0 V 9 - 14 V
9 - 14 V
9 - 14 V 9 - 14 V*9 - 14 V*
9 - 14 V
9 - 14 V
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-201
357 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Read PNP, REVERSE, 2ND and LOW signals.
When using TOYOTA hand-held tester:
PREPARATION:
(a) Remove the DLC3 cover.
(b) Connect a TOYOTA hand-held tester to the DLC3.
(c) Turn the ignition switch ON and TOYOTA hand-held tes-
ter main switch ON.
CHECK:
Shift lever into the P, R, N, 2 and L positions, and read the PNP,
REVERSE, 2ND and LOW signals on the TOYOTA hand-held
tester.
OK:
Shift positionSignal
22ND OFF " ON
LLOW OFF " ON
RREVERSE OFF " ON
P, NNSW OFF " ON
When not using TOYOTA hand-held tester:
PREPARATION:
(a) Remove the glove compartment.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between each of terminals NSW, 2, L and R
of ECM and body ground when the shift lever is shifted to the
following positions.
OK:
HINT:
*: The voltage will drop slightly due to lighting up of the back up
light.
OK Check and replace the ECM (See page IN-30).
NG

Q07657
DI-202
- DIAGNOSTICSAUTOMATIC TRANSAXLE
358 Author
: Date
:
2001 AVALON (RM808U)
2 Check park/neutral position switch.
PREPARATION:
(a) Jack up the vehicle.
(b) Remove the park/neutral position switch (See page
AX-4).
CHECK:
Check continuity between each terminal shown below when the
shift lever is moved to each position.
Shift PositionTerminal No. to continuity
P2 - 75 - 6
R2 - 8-
N2 - 95 - 6
D2 - 10-
22 - 3-
L2 - 4-
OK:
There is continuity.
NG Replace the park/neutral position switch.
OK
Repair or replace harness and connector between battery and park/neutral position switch, park/
neutral position switch and ECM (See page IN-30).
NG Repair or replace the harness and connector.
OK
Check and replace the ECM (See page
IN-30).

DI02D-02
:
Symptoms
Transaxle Control
System Check SheetInspector 's
Name
/ / Date Vehicle
Brought In Customer 's Name / /
/ /Registration No.
Registration Year
Frame No.
Odometer Readingkm
mile
Date Problem
Occurred
Frequency prob
lem occursContinuous
Intermittent ( times a day)
Vehicle does not move ( Any position Particular position )
Lock-up malfunction
Shift point too high or too low
Slip or shudder
No kick-down
Others
No up-shift( 1st " 2nd 2nd " 3rd 3rd " O/D)
No down-shift( O/D "3rd 3rd " 2nd 2nd " 1st)
Harsh engagement( N "D Lock-up Any drive position)
Check ItemMalfunction
Indicator LampNormal
DTC Check1st Time
2nd TimeRemains ON
Normal codeMalfunction code (Code )
Normal codeMalfunction code (Code )
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-159
315 Author
: Date
:
2001 AVALON (RM808U)
CUSTOMER PROBLEM ANALYSIS CHECK