TOYOTA AVALON 2001 Service Repair Manual

DI-170
- DIAGNOSTICSAUTOMATIC TRANSAXLE
326 Author
: Date
:
2001 AVALON (RM808U)
7. HYDRAULIC TEST
Measure the line pressure.
NOTICE:

Do the test at normal operation fluid temperature 50 - 80 °C (122 - 176 °F).

The line pressure test should always be carried out in pairs. One technician should observe
the conditions of wheels or wheel stoppers outside the vehicle while the other is doing the test.

Be careful to prevent SST's hose from interfering with the exhaust pipe.
(1) Warm up the ATF.
(2) Remove the test plug on the transaxle case front left side and connect SST (See page AX-33
for the location to connect SST).
SST 09992-00095 (09992-00231, 09992-00271)
(3) Fully apply the parking brake and chock the 4 wheels.
(4) Connect an OBD II scan tool or TOYOTA hand-held tester to DLC3.
(5) Start the engine and check idling speed.
(6) Keep your left foot pressing firmly on the brake pedal and shift into D position.
(7) Measure the line pressure when the engine is idling.
(8) Depress the accelerator pedal all the way down. Quickly read the highest line pressure when
engine speed reaches stall speed.
(9) In the same manner, do the test in R position.
Specified line pressure:
ConditionD position kPa (kgf/cm2, psi)R position kPa (kgf/cm2, psi)
Idling401 - 461 (4.1 - 4.7, 58 - 66)804 - 882 (8.2 - 9.0, 117 - 128)
Stall1,138 - 1,236 (11.6 - 12.6, 165 - 179)1,716 - 1,854 (17.5 - 18.9, 249 - 269)
If the measured pressure is not up to the specified value, recheck the throttle cable adjustment and retest.
Evaluation:
ProblemPossible cause
If the measured values at all positions are higher

Throttle cable out of adjustment

Throttle valve defective

Regulator valve defective
If the measured values at all positions are lower

Throttle cable out of adjustment

Throttle valve defective

Regulator valve defective

Oil pump defective

O/D direct clutch defective
If pressure is low in the D position only
D position circuit fluid leakage

Forward clutch defective
If pressure is low in the R position only

R position circuit fluid leakage

Direct clutch defective

1st & reverse brake defective

Q00224
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-171
327 Author
: Date
:
2001 AVALON (RM808U)
8. MANUAL SHIFTING TEST
HINT:
With this test, it can be determined whether the trouble is within
the electrical circuit or is a mechanical problem in the transaxle.
(a) Disconnect the solenoid wire.
(b) Inspect the manual driving operation.
Check that the shift and gear positions correspond with
the table below.
While driving, shift through the L, 2 and D positions.
Check that the gear change corresponds to the shift posi-
tion.
Shift PositionGear Position
DO/D
2O/D
L1st
RReverse
PPawl Lock
HINT:
If the L, 2 and D position gear positions are difficult to positions
are difficult to distinguish, do the above read test.
If any abnormality is found in the above test, the problem is in
the transaxle itself.
(c) Connect the solenoid wire.
(d) Cancel out the DTC (See page DI-160).

DI02I-07
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-175
331 Author
: Date
:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the diagnostic trouble code check but the trouble still occurs, check the
circuits for each symptom in the order given in the charts on the following pages and proceed to the page
given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
Chapter 1: Electronic circuit matrix chart
Chapter 2: On-vehicle repair matrix chart
Chapter 3: Off-vehicle repair matrix chart
If the instruction ºProceed to next circuit inspection shown in matrix chartº is given in the flow chart for each
circuit, proceed to the circuit with the next highest number in the table to continue the check.
If the trouble still occurs even though there are no abnormalities in any of the other circuits, then check and
replace the ECM.
Chapter 1: Electronic circuit matrix chart
SymptomSuspect AreaSee page
No up-shift (A particular gear, from 1st to 3rd gear, is not up-
shifted)ECMIN-30
No up-shift (3rd " O/D)
1. O/D main switch & O/D OFF indicator light circuit
2. O/D cancel signal circuit
3. ECMDI-206
DI-203
IN-30
No down-shift (O/D " 3rd)ECMIN-30
No down-shift (A particular gear, from 3rd to 1st gear, is not
down-shifted)ECMIN-30
No lock-up or No lock-up offECMIN-30
Shift point too high or too lowECMIN-30
Up-shift to 2nd while in L positionECMIN-30
Up-shift to 3rd while in 2 positionECMIN-30
Up-shift to O/D from 3rd while O/D main switch is OFF1. O/D main switch & O/D OFF indicator light circuit
2. ECMDI-206
IN-30
Up-shift to O/D from 3rd while engine is coldECMIN-30
Harsh engagement (N " D)ECMIN-30
Harsh engagement (Any driving position)ECMIN-30
Poor accelerationECMIN-30
Engine stalls when starting off or stoppingECMIN-30
No kick-downECMIN-30

DI-176
- DIAGNOSTICSAUTOMATIC TRANSAXLE
332 Author
: Date
:
2001 AVALON (RM808U)
Chapter 2: On-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. Manual valve
2. Throttle valve
3. Primary regulator valve
4. Off-vehicle repair matrix chart





-
Vehicle does not move in R positionOff-vehicle repair matrix chart-
No up-shift (1st " 2nd)1. 1-2 shift valve
2. Off-vehicle repair matrix chart

-
No up-shift (2nd " 3rd)1. 2-3 shift valve
2. Off-vehicle repair matrix chart

-
No up-shift (3rd " O/D)1. 3-4 shift valve
2. Off-vehicle repair matrix chart

-
No down-shift (O/D " 3rd)3-4 shift valve

No down-shift (3rd " 2nd)2-3 shift valve

No down-shift (2nd " 1st)1-2 shift valve

No lock-up or No lock-up off1. Lock-up relay valve
2. Off-vehicle repair matrix chart

-
Harsh engagement (N " D)1. C1 accumulator
2. Off-vehicle repair matrix chart

-
Harsh engagement (N " R)
1. C2 accumulator
2. No.1 accumulator control valve
3. Off-vehicle repair matrix chart



-
Harsh engagement (N " L)Low coast modulator valve

Harsh engagement (Lock-up)1. Lock-up relay valve
2. Off-vehicle repair matrix chart

-
Harsh engagement (1st " 2nd " 3rd " O/D)
1. Throttle modulator valve
2. Cut back valve
3. Throttle valve





Harsh engagement (2nd " 3rd)C2 accumulator

Harsh engagement (3rd " O/D)B0 accumulator

Harsh engagement (O/D " 3rd)1. C0 accumulator
2. B
0 accumulator




Slip or shudder (Forward and reverse)
1. Throttle valve
2. Oil strainer
3. Off-vehicle repair matrix chart



-
No engine braking (1st: L position)1. Low coast modulator valve
2. Off-vehicle repair matrix chart

-
No engine braking (2nd: 2 position)1. 2nd coast modulator valve
2. Off-vehicle repair matrix chart

-
No kick-down
1. 1-2 shift valve
2. 2-3 shift valve
3. 3-4 shift valve

- 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).