2001 TOYOTA AVALON Service Repair Manual

- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-177
333 Author
: Date
:
2001 AVALON (RM808U)
Chapter 3: Off-vehicle repair
(
: A541E automatic transaxle repair manual Pub. No. RM741U)
SymptomSuspect AreaSee page
Vehicle does not move in any forward position and reverse posi-
tion
1. Front and rear planetary gear
2. O/D planetary gear
3. O/D one-way clutch (F
0)
4. O/D direct clutch (C
0)
5. Forward clutch (C
1)
6. O/D brake (B
0)












Vehicle does not move in R position
1. Front and rear planetary gear unit
2. Direct clutch (C
2)
3. O/D direct clutch (C
0)
4. 1st & reverse brake (B
3)








No up-shift (1st " 2nd)1. No. 1 one-way clutch (F1)
2. 2nd brake (B
2)




No up-shift (2nd " 3rd)Direct clutch (C2)

No up-shift (3rd " O/D)O/D brake (B0)

No lock-up or No lock-up offTorque converter clutch-
Harsh engagement (N " D)
1. Forward clutch (C1)
2. O/D one-way clutch (F
0)
3. No. 2 one-way clutch (F
2)






Harsh engagement (N " R)1. Direct clutch (C2)
2. 1st & reverse brake (B
3)




Harsh engagement (Lock-up)Torque converter clutch-
Slip or shudder (Forward position: After warm-up)
1. Torque converter clutch
2. O/D direct clutch (C
0)
3. Forward clutch (C
1)
4. O/D one-way clutch (F
0)








Slip or shudder (R position)
1. Direct clutch (C2)
2. 1st & reverse brake (B
3)
3. O/D direct clutch (C
0)






Slip or shudder (1st)No. 2 one-way clutch (F2)

Slip or shudder (2nd)1. No. 1 one-way clutch (F1)
2. 2nd brake (B
2)




Slip or shudder (3rd)Direct clutch (C2)

Slip or shudder (O/D)O/D brake (B0)

No engine braking (1st ~ 3rd: D position)2nd brake (B2)

No engine braking (1st: L position)1st & reverse brake (B3)

No engine braking (2nd: 2 position)2nd coast brake (B1)

Poor acceleration (All position)1. Torque converter clutch
2. O/D planetary gear-


Poor acceleration (O/D)1. O/D direct clutch (C0)
2. O/D planetary gear



Large shift shock or engine stalls when starting off or stoppingTorque converter clutch-

DI6K7-01
D01054
ECM Terminals
E8 E7 E6
E5 E4 DI-174
- DIAGNOSTICSAUTOMATIC TRANSAXLE
330 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
IG ON10 - 14
S1 (E4-7) e E1 (E5-17)
P e BR1st or 2nd gear10 - 14S1 (E4 7) e E1 (E5 17)

P e BR
3rd or O/D gearBelow 1
IG ONBelow 1
S2 (E6-1) e E1 (E5-17)G-Y e BR2nd or 3rd gear10 - 14S2 (E6 1) e E1 (E5 17)GY e BR
1st or O/D gearBelow 1
SL (E6 15)E1 (E5 17)GWBRIG ONBelow 1SL (E6-15) e E1 (E5-17)G-W e BRVehicle driving under lock-up position10 - 14
NC2+ (E4-24)eNC2-
(E4-23)R e GEngine is running (Except 2nd gear)Pulse signal is output
Below 1 e 4 - 5
SLN+
(E4-20) e SLN-
(E4-19)P-L e YIG ON10 - 14
OD1 (E7-24) e E1 (E5-17)GR e BRIG ON5 - 6
ODLP (E8 9)E1 (E5 17)GOBRExcept O/D gear10 - 14ODLP (E8-9) e E1 (E5-17)G-O e BRO/D gearBelow 1
L (E6 13)E1 (E5 17)YBRIG ON and Shift lever L position10 - 14L (E6-13) e E1 (E5-17)Y e BRIG ON and Shift lever other than L positionBelow 1
2 (E6 14)E1 (E5 17)GYBRIG ON and Shift lever 2 position10 - 142 (E6-14) e E1 (E5-17)G-Y e BRIG ON and Shift lever other than 2 positionBelow 1
R (E6 8)E1 (E5 17)RBBRIG ON and Shift lever R position10 - 14R (E6-8) e E1 (E5-17)R-B e BRIG ON and Shift lever other than R positionBelow 1
NSW (E7 20)E1 (E5 17)BWBRIG ON and Shift lever P or N position10 - 14NSW (E7-20) e E1 (E5-17)B-W e BRIG ON and Shift lever other than P or N positionBelow 1
ODMS (E6 12)E1 (E5 17)GOBRIG ON10 - 14ODMS (E6-12) e E1 (E5-17)G-O e BRIG ON and Press continuously O/D main switchBelow 1.5
IG ON and vehicle stationaryBelow 1.5
SPD (E7-22) e E1 (E5-17)V-W e BRIG ON and one front wheel is turned slowlyPulse signal is output
Below 1.5 e 4 - 5

I13657
*2 *1
*3
W-BW-B
*4
B8
Buckle Switch
LH
21
R-W
R-W 6
BC1 ID19
R-WR-W16
B4Body ECU
DBKL
J14
J/C
W-B
W-B 11
J11 J/C
AA
BK
*1: w/ Sliding Roof
*2: w/o Power Seat
*3: w/o Driving Position Memory
*4: w/ Driving Position MemoryBC1 CC DI-658
- DIAGNOSTICSBODY CONTROL SYSTEM
814 Author
: Date
:
2001 AVALON (RM808U)
Driver buckle switch circuit
WIRING DIAGRAM
DI6LY-01

- DIAGNOSTICSBODY CONTROL SYSTEM
DI-659
815 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check driver buckle switch. (See page BE-53)
NG Replace the driver buckle switch.
OK
2 Check wireharness and connector between driver buckle switch and body
ground (See page IN-30).
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI-622).

I13660
D2DLC2
D1
DLC1Tc4
LG-R
LG-R
LG-R Tc1122
II213 4
3A 3A
3G 4LG-R18Body ECU
Tc B4
LG-R
66
4H 4A J/B No. 3
J/B No. 4 DI-666
- DIAGNOSTICSBODY CONTROL SYSTEM
822 Author
: Date
:
2001 AVALON (RM808U)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that DTC output is required.
WIRING DIAGRAM
DI6M2-01

AB0119N09214
I11292
ON
DLC3
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-667
823 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC3.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals SIL(7) and CG(4) of DLC3.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-622).
NG
2 Check harness and connector between body control ECU and DLC3, DLC3 and
body ground (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace Body Control ECU
(See page IN-30).

I13649
D11
Door Courtesy Switch
Front LH
1
R-L1717
3E
3D
R-L5
B4Body ECU
DCTY
PCTY 1
O1717
4E
4F
O3
B5 D12
Door Courtesy Switch
Front RH
D13
Door Courtesy Switch
Rear LH
1
R-WR-W 2
IA1145
4F4F
4E 5R-W16
B5
RCTY
D14
Door Courtesy Switch
Rear RH
1R-W J/B No. 3
J/B No. 4
J/B No. 4
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-639
795 Author
: Date
:
2001 AVALON (RM808U)
Door courtesy switch circuit
CIRCUIT DESCRIPTION
The door courtesy switch goes on when the door is opened and goes off when door is closed.
WIRING DIAGRAM
DI6LP-01

DI-640
- DIAGNOSTICSBODY CONTROL SYSTEM
796 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check operation of door courtesy light.
CHECK:
Check that door courtesy light comes on when door opened, and goes off when door is closed.
OK:
Must be operated normally.
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-622).
NG
2 Check courtesy switch (See page BE-31).
NG Replace the courtesy switch.
OK
3 Check wireharness and connector between courtesy light and body ECU, courte-
sy switch and body door ECU (See page IN-30).
NG Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI-622).