2001 TOYOTA AVALON light

N09214
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-161
317 Author
: Date
:
2001 AVALON (RM808U)

The diagnosis system operates in normal mode
during normal vehicle use, and also has a check
mode for technicians to simulate malfunction symp-
toms and perform troubleshooting. Most DTCs use
2-trip detection logic(*) to prevent erroneous detec-
tion. By switching the ECM to check mode when
troubleshooting, the technician can cause the MIL
to light up and for a malfunction that is only detected
once or momentarily (TOYOTA hand-held tester)
(See page DI-160).

*2-trip detection logic:
When a logic malfunction is first detected, the mal-
function is temporarily stored in the ECM memory.
If the same malfunction is detected again during the
2nd test drive, this 2nd detection causes the MIL to
light up.
(b) Inspect the DLC3.
The vehicle's ECM uses ISO 9141-2 for communication.
The terminal arrangement of DLC3 complies with SAE
J1962 and matches the ISO 9141-2 format.
Tester connectionConditionSpecified condition
7 (Bus
Line) - 5 (Signal ground)During communicationPulse generation
4 (Chassis Ground) - BodyAlways1 W or less
5 (Signal Ground) - BodyAlways1 W or less
16 (B+) - BodyAlways9 - 14 V
HINT:
If your display shows ºUNABLE TO CONNECT TO VEHICLEº
when you have connected the cable of OBD II scan tool or TOY-
OTA hand-held tester to DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
side or tool side.

If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.

If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.

FI0534
F07887
TOYOTA hand-held tester
DLC3
DI-162
- DIAGNOSTICSAUTOMATIC TRANSAXLE
318 Author
: Date
:
2001 AVALON (RM808U)
2. INSPECT DIAGNOSIS (NORMAL MODE)
(a) Check the MIL.
(1) The MIL comes on when the ignition switch is turned
ON and the engine is not running.
HINT:
If the MIL does not light up, troubleshoot the combination meter
(See page BE-2).
(2) When the engine is started, the MIL should go off.
If the lamp remains on, the diagnosis system has
detected a malfunction or abnormality in the sys-
tem.
(b) Check the DTC.
NOTICE:
TOYOTA hand-held tester only:
When the diagnostic system is switched from normal mode
to check mode, it erases all DTCs and freeze frame data re-
corded in normal mode. So before switching modes, al-
ways check the DTCs and freeze frame data, and note them
down.
(1) Prepare an OBD II scan tool (complying with SAE
J1978) or TOYOTA hand-held tester.
(2) Connect the OBD II scan tool or TOYOTA hand-
held tester to DLC3 at the lower of the instrument
panel.
(3) Turn the ignition switch ON and turn the OBD II scan
tool or TOYOTA hand-held tester switch ON.
(4) Use the OBD II scan tool or TOYOTA hand-held
tester to check the DTCs and freeze frame data and
note them down (For operating instructions, see the
OBD II scan tool's instruction book).
(5) See page DI-172 to confirm the details of the DTCs.
NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding TOYOTA hand-held tester) to check the DTCs, use
normal mode. For codes on the DTCs chart subject to
º2-trip detection logicº, turn the ignition switch OFF after
the symptoms have been simulated the 1st time. Then re-
peat the simulation process again. When the program has
DTCs they are recorded in the ECM.

DI-164
- DIAGNOSTICSAUTOMATIC TRANSAXLE
320 Author
: Date
:
2001 AVALON (RM808U)
(b) Clearance the DTC.
The following operation will erase the DTC and freeze
frame data. Operating an OBD II scan tool (complying
with SAE J1978) or TOYOTA hand-held tester to erase
the codes (See the OBD II scan tool's instruction book for
operating instructions.).
4. ROAD TEST
NOTICE:
Perform the test at normal operating ATF temperature 50 - 80 °C (122 - 176 °F).
(a) D position test
Shift into the D position and fully depress the accelerator pedal and check the following points:
(1) Check up-shift operation.
Check to see that 1 " 2, 2 " 3 and 3 " O/D up-shift takes place,and that the shift points conform
the automatic shift schedule (See page SS-24).
HINT:

O/D Gear Up-shift Prohibition Control (1. Coolant temp. is 60 °C (140 °F) or less. 2. If there is a 10
km/h (6 mph) difference between the set cruise control speed and vehicle speed.)

O/D Gear Lock-up Prohibition Control (1. Brake pedal is depressed. 2. Coolant temp. is 60 °C (140
°F) or less.)
(2) Check for shift shock and slip.
Check for shock and slip at the 1 " 2, 2 " 3 and 3 " O/D up-shifts.
(3) Check for abnormal noises and vibration.
Run at the D position lock-up or O/D gear and check for abnormal noises and vibration.
HINT:
The check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be
due to loss of balance in the differential torque converter clutch, etc.
(4) Check kick-down operation.
While running in the D position, 2nd, 3rd and O/D gears, check to see that the possible kick-down
vehicle speed limits for 2 " 1, 3 " 2 and O/D " 3 kick-downs conform to those indicated in the
automatic shift schedule (See page SS-24).
(5) Check abnormal shock and slip at kick-down.
(6) Check the lock-up mechanism.

Drive in D position, O/D gear, at a steady speed (lock-up ON) of about 60 km/h (37 mph).

Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
If there is a big jump in engine speed, there is no lock-up.
(b) 2 position test
Shift into the 2 position and fully depress the accelerator pedal and check the following points:
(1) Check up-shift operation.
Check to see that the 1 " 2 up-shift takes place and that the shift point conforms to the automatic
shift schedule (See page SS-24).
HINT:
There is no O/D up-shift and lock-up in the 2 position.
(2) Check engine braking.
While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine
braking effect.
(3) Check for abnormal noises during acceleration and deceleration, and for shock at up-shift and
down-shift.

AT4252
0 - 1 mm (0 - 0.04 in.)
Q00199
D02450P N
R
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-167
323 Author
: Date
:
2001 AVALON (RM808U)
(d) Check the fluid leaks.
Check for leaks in the transaxle.
If there are leaks, it is necessary to repair or replace O-rings,
gasket, oil seals, plugs or other parts.
(e) Inspect and adjust the throttle cable.
(1) Check that the accelerator pedal is fully released.
(2) Check that the inner cable is not slack.
(3) Measure the distance between the outer cable end
and stopper on the cable.
Standard distance: 0 - 1 mm (0 - 0.04 in.)
If the distance is not the standard, adjust the cable by adjusting
nuts.
(f) Inspect and adjust the shift lever position.
When shifting the shift lever from the N position to other
positions, check that the lever can be shifted smoothly
and accurately to each position and that the position indi-
cator is aligned with the correct position.
If the indicator is not aligned with the correct position, carry out
the following adjustment procedures.
(1) Loosen the nut on the shift lever.
(2) Push the control shaft fully downward.
(3) Return the control shaft lever 2 notches to N posi-
tion.
(4) Set the shift lever to N position.
(5) While holding the shift lever lightly toward the R
position side, tighten the shift lever nut.
Torque: 13 N´m (130 kgf´cm, 9 ft´lbf)
(6) Start the engine and make sure that the vehicle
moves forward when shifting the lever from the N to
D position and reverses when shifting it to the R
position.

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-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).

I14524
RDRL No. 2 Relay
2
22
2 43
1
2R-B R-B8
B410Body ECU
DRL
6
EA1
8
IF1R
2
R-B2
2 1 2 HEAD RH-UPR
HEAD LH-UPR
12
L
10 9
IF1
L L 2 1
G 2
G
GGH2
Headlight High RH
1
2
R-W9
IC1
R-W
2
EA1
G2
22
2
2
2
2 2
21
42
3 DRL No. 4 Relay
DRL No. 3 Relay
12
53
4 W-R
W-R W-R
5W-B
W-B
10
R-L11
W-B W-B
2E 4
1
2E
MAIN
2
2GR-B
21
BatteryFL MAIN1
F6 F71 FL Block
B
to Body ECU5
5
5
5DRL
21
5
HEAD Relay
3
21 4
5
to Headlight
Low LH and RHEA R-L H1
Headlight High LH REngine Room R/B No. 2
Engine Room R/B No. 7R-BEA1
Engine Room R/B No. 2 IF1 EA1
EA1
IF3
EA1
Engine Room J/B
Engine Room R/B No. 5
B
R-B
RW-B R
R
9
EA1
R-W DI-668
- DIAGNOSTICSBODY CONTROL SYSTEM
824 Author
: Date
:
2001 AVALON (RM808U)
Daytime running light No.2, 3 and 4 relay circuit
WIRING DIAGRAM
DI6M3-01

I13647
Battery FL
MAINB1
1
F6
F7B 2
21 1MAIN
2E
2G R-BR5
55
5 21 34 Headlight Relay
R-BR-B4
1J8Body ECU
HRLY
5
55 1
21
2 HEAD
RH
LW RHEAD
LH
LW R
3
IF1
G-W
2
1
W-BG-W
*1Headlight
Low RHR-B
2
1H3
Headlight
Low LH
W-B
ED *1 EB: Canada
EA: Except Canada Engine Room J/B
FL Block
H4
Engine Room R/B No. 5
Engine Room R/B No. 5Driver Side J/B
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-635
791 Author
: Date
:
2001 AVALON (RM808U)
Headlight relay circuit
CIRCUIT DESCRIPTION
Head light relay will be ºONº by operating the headlight switch. The transistor which activates the taillight
relay has two sorts: one activates directly by the headlight switch for fail safe and the other activates by CPU.
the one that activates by CPU has two systems and prevents the headlight from turning off at the time of
one system trouble in the automatic operation circuit.
WIRING DIAGRAM
DI6LN-01