2001 TOYOTA AVALON Service Repair Manual

DI02C-06
Mechanical System Test
P. DI-160NG
Customer Problem Analysis Vehicle Brought to Workshop
Check DTC and Freeze Frame Data (Pre-check)Items inside
P. DI-159are titles of pages in this manual, with the
page number indicated in the bottom portion. See the indicated
pages for detailed explanations.
Connect an OBD II scan tool or TOYOTA hand-held tester to DLC3.
If the display shows ºUNABLE TO CONNECT TO VEHICLEº when you have connected the
scan tool / TOYOTA hand-held tester, inspect DLC3 P. DI-160
Record or Print DTC and Freeze Frame Data P. DI-160
Clear DTC and Freeze Frame Data P. DI-160
Symptom does not occur
Problem Symptom Confirmation
P. DI-160 Symptom Simulation
Symptom occurs
P. DI-160 OK Code
DTC Check
P. DI-160
DTC Chart
P. DI-172Basic Inspection
Manual Shifting TestOK
P. DI-160NG
NG
NG NG
NG OKOK
OKOK Matrix Chart of Problem Symptoms - P. DI-175
Chapter 1
(Electronic)Chapter 2
(On-V ehicle)
P. DI-175
P. DI-175Chapter 3
(Off-V ehicle)
P. DI-175
Circuit
Inspection
O/D Cancel Signal Check

O/D Main Switch & O/D OFF Indicator Light Check
P. DI-203 to DI-206
Identification of ProblemParts Inspection
End
Confirmation Test
Repair Setting the Check Mode Diagnosis P. DI-160 Visual Inspection1
5
9
16 2
6
10
15 3
7
11
14 4
8
12
13
17
DI-158
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314 Author
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2001 AVALON (RM808U)
AUTOMATIC TRANSAXLE
HOW TO PROCEED WITH TROUBLESHOOTING

DI02G-06
D07229
Cruise Control ECU ECMFloor Shift:
O/D Main SwitchColumn Shift:
O/D Main Switch
DLC3
Stop Light Switch
Shift Solenoid Valve SLN
Shift Solenoid Valve Direct Clutch
Speed Sensor
Park/Neutral
Position Switch Shift Solenoid
Valve SL
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-173
329 Author
: Date
:
2001 AVALON (RM808U)
PARTS LOCATION

DI02E-08
FI0534
F07887DLC3
TOYOTA hand-held tester
DI-160
- DIAGNOSTICSAUTOMATIC TRANSAXLE
316 Author
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:
2001 AVALON (RM808U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description

When troubleshooting OBD II vehicles, the only dif-
ference from the usual troubleshooting procedure
is that you connect to the vehicle an OBD II scan
tool complying with SAE J1987 or TOYOTA hand-
held tester, and read off various data output from
the vehicle's ECM.

OBD II regulations require that the vehicle's on-
board computer lights up the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com-
puter detects a malfunction in the computer itself or
in drive system components which affect vehicle
emissions. In addition to the MIL lighting up when
a malfunction is detected, the applicable DTCs pre-
scribed by SAE J2012 are recorded in the ECM
memory (See page DI-14).
If the malfunction only occurs in 3-trip, the MIL goes
off but the DTCs remain recorded in the ECM
memory.

To check the DTCs, connect an OBD II scan tool or
TOYOTA hand-held tester to DLC3 on the vehicle.
The OBD II scan tool or TOYOTA hand-held tester
also enables you to erase the DTCs and check
freeze frame data and various forms of engine data
(For instruction book).

DTCs include SAE controlled codes and Manufac-
turer controlled codes.
SAE controlled codes must be set as prescribed by
the SAE, while Manufacturer controlled codes can
be set freely by the manufacturer within the pre-
scribed limits (See DTC chart on page ).

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.

F07887
TOYOTA hand-held tester
DLC3
BR3904
0.13 sec. 0.13 sec.
ON
OFF
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-163
319 Author
: Date
:
2001 AVALON (RM808U)
3. INSPECT DIAGNOSIS (CHECK MODE)
HINT:
TOYOTA hand- held tester only: Compared to the normal
mode, the check mode has high sensing ability to detect mal-
functions. Furthermore, the same diagnostic items which are
detected in Normal mode can also be detected in Check mode.
(a) Check the DTC.
(1) Check the initial conditions.

Battery positive voltage 11 V or more

Throttle valve fully closed

Transaxle in P position

Air conditioning switched OFF
(2) Turn the ignition switch OFF
(3) Prepare a TOYOTA hand-held tester
(4) Connect the TOYOTA hand-held tester to DLC3 at
the lower of the instrument panel.
(5) Turn the ignition switch ON and switch the TOYOTA
hand-held tester ON.
(6) Switch the TOYOTA hand-held tester from Normal
mode to Check mode (Check that the MIL flashes).
(7) Start the engine (MIL goes out after the engine
starts).
(8) Simulate the conditions of the malfunction de-
scribed by the customer.
NOTICE:
Leave the ignition switch ON until you have checked the
DTCs, etc..
(9) After simulating the malfunction conditions, use the
TOYOTA hand-held tester diagnosis selector to
check the DTCs and freeze frame data, etc.
HINT:
Take care not to turn the ignition switch OFF, as turning it off
switches the diagnosis system from Check mode to Normal
mode, so all DTCs, etc. are erased.
(10) After checking the DTC, inspect the applicable cir-
cuit.

DI-164
- DIAGNOSTICSAUTOMATIC TRANSAXLE
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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.