Page 271 TOYOTA AVALON 2001 Service Repair Manual

W04200
Normal Signal Waveform
2 m/s / DivisionGND
1 V / Division
R00948
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-271
427 Author
: Date
:
2001 AVALON (RM808U)
4 Check speed sensor and sensor rotor serrations.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Disconnect the connector from the ABS & BA & TRAC &
VSC ECU.
(b) Connect the oscilloscope to the terminals FR+, FL+, RR+
or RL+ and GND of the ECU harness side connector.
CHECK:
Drive the vehicle at about 30 km/h (19 mph), and check the sig-
nal waveform.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
5 Check sensor rotor and sensor tip.
Front:
PREPARATION:
Remove the front drive shaft (See page SA-16).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.
PREPARATION:
Remove the front speed sensor (See page BR-60).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.

F07887
TOYOTA Hand-
held Tester
DLC3
F19119
DLC1
Ts E1
DLC3
CG
Ts
DI-256
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
412 Author
: Date
:
2001 AVALON (RM808U)
(b) In case of using TOYOTA hand-held tester:
Check the sensor signal.
(1) Hook up the TOYOTA hand- held tester to the
DLC3.
(2) Do step (3) - (6) on the previous page.
(3) Read the DTC by following the prompts on the tes-
ter screen.
HINT:
Please refer to the TOYOTA hand-held tester operator's manu-
al for further details.
DTC of speed sensor check function:
Code No.DiagnosisTrouble Area
C1271 / 71Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Right front speed sensor rotor
C1272 / 72Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Left front speed sensor rotor
C1273 / 73Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Right rear speed sensor rotor
C1274 / 74Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Left rear speed sensor rotor
C1275 / 75Abnormal change in output signal of right front speed sen-
sorRight front speed sensor rotor
C1276 / 76Abnormal change in output signal of left front speed sensorLeft front speed sensor rotor
C1277 / 77Abnormal change in output signal of right rear speed sensorRight rear speed sensor rotor
C1278 / 78Abnormal change in output signal of left rear speed sensorLeft rear speed sensor rotor
3. STEERING ANGLE SENSOR ZERO POINT CALIBRA-
TION
NOTICE:
Make sure to perform steering angle sensor zero point cal-
ibration when:

Replacing the steering angle sensor or ECU.

Adjusting the front wheel alignment of the steering
wheel center point in accordance with removal and
installation or replacement of the suspension, axle or
steering parts.
(a) Using the SST, connect terminals Ts and E
1 of DLC1 or
Ts and CG of DLC3
.
SST DLC1: 09843-18020
DLC3: 09843-18040
(b) Turn the ignition switch to the ON position, without start-
ing the engine.
(c) Make sure the steering wheel off center angle is within 3
degrees of center before attempting calibration.

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

A02032
HAFL ON
HAFR
(+)
(-)
- DIAGNOSTICSENGINE
DI-1 15
271 Author
: Date
:
2001 AVALON (RM808U)
DTC P1135 A/F Sensor Heater Circuit Malfunction (Bank
1 Sensor 1)
DTC P1155 A/F Sensor Heater Circuit Malfunction (Bank
2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI-43.
DTC No.DTC Detecting ConditionTrouble Area
P1135
When the heater operates, heater current exceeds 8 A
(2 trip detection logic)
Open or short in heater circuit of A/F sensor
A/F h tP1135
P1155Heater current of 0.25 A or less when the heater operates
(2 trip detection logic)
A/F sensor heater

ECM
WIRING DIAGRAM
Refer to DTC P0125 on page DI-43.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check voltage between terminals HAFL, HAFR of ECM connector and body
ground.
PREPARATION:
(a) Remove the glove compartment (See page SF-83).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals HAFL, HAFR of the
ECM connector and body ground.
OK:
Voltage: 9 - 14 V
OK Check and replace ECM (See page IN-30).
NG
2 Check resistance of A/F sensor heater (See page SF-79).
DI2H9-03

DI4DE-02
A02016
E6 E8E7
31 30 29 28 2717
19 20 21
22 23 24 25 2611 12
13 141 2 3 4 5 6 7 8 9
10
ECM Terminals
15 16
181 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16
188
20 21 22 23 2417
191 2 3 4 5 6
7 9 10 11 12
13 14 15 16 171 2 3 4 5 6 7 8 9
10 12 11 13 14 15 16 17 18 19
20 21 23 22 24 26 25 27
281 2 3 4 5 6 7
8 9 10 11 12 13 14 15
16 17 18 19 20 21 22
E5 E4 DI-20
- DIAGNOSTICSENGINE
176 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECM
Symbols (Terminal No.)Wiring ColorConditionSTD Voltage (V)
BATT (E8-1) - E1 (E5-17)B-R eBRAlways9 - 14
+B (E8-16) - E1 (E5-17)B-W e BRIG switch ON9 - 14
VC (E5-2) - E2 (E5-18)L-R e WIG switch ON4.5 - 5.5
VTA1 (E5 23) E2 (E5 18)LGWIG switch ON, Throttle valve fully closed0.3 - 1.0VTA1 (E5-23) - E2 (E5-18)LGe WIG switch ON, Throttle valve fully open2.7 - 5.2
VG (E5-10) - E2G (E5-19)R eR-BIdling, A/C switch OFF1.1 - 1.5
VV1+ (E4-10)
- NE- (E5-24)B-W eL
IdliPulse generation
VV2+ (E4-22)
- NE- (E5-24)B-W eL
IdlingPulse generation
(See page DI-124)
NE+ (E5-16) - NE- (E5-24)B-W eLIdlingPulse generation
(See page DI-124)
OC1+ (E4-6) - OC1- (E4-5)R-B e RPl tiOC2+ (E4-29)
- OC2- (E4-18)R-L eR-WIG switch ONPulse generation
(See page DI-127)
THA (E5-22) - E2 (E5-18)L-B eWIdling, Intake air temp. 20°C (68°F)0.5 - 3.4
THW (E5-14) - E2 (E5-18)G-Y eWIdling, Engine coolant temp. 80°C (176°F)0.2 - 1.0
STA (E8-7) - E1 (E5-17)B-R e BRCranking6.0 or more
#10 (E5-5) - E01 (E4-21)
#20 (E5-6) - E01 (E4-21)
#30 (E4 1) E01 (E4 21)
L eW-B
R eW-B
YWB
IG switch ON9 - 14
#30 (E4-1) - E01 (E4-21)
#40 (E4-2) - E01 (E4-21)
#50 (E4-3) - E01 (E4-21)
#60 (E4-4) - E01 (E4-21)Y eW-B
W eW-B
G eW-B
G eW-B
IdlingPulse generation
(See page DI-58)
IGT1 (E4-11) - E1 (E5-17)GR eBR
IGT2 (E4-12) - E1 (E5-17)B-R eBR
IGT3 (E4-13) - E1 (E5-17)LG-B eBRIdliPulse generation
IGT4 (E4-14) - E1 (E5-17)L-Y eBRIdlingPulse generation
(See page DI-1 17)
IGT5 (E4-15) - E1 (E5-17)L eBR
(g )
IGT6 (E4-16) - E1 (E5-17)LG eBR
IG switch ON4.5 - 5.5
IGF (E4-25) - E1 (E5-17)B-Y eBRIdlingPulse generation
(See page DI-1 17)
ACIS (E8-17) - E01 (E4-21)R-Y eW-BIG it h ON914ACI1 (E5-15) - E01 (E4-21)W-R eW-BIG switch ON9 - 14
FC (E8 3) E01 (E4 21)GBWBIG switch ON9 - 14FC (E8-3) - E01 (E4-21)G-B eW-BIdling0 - 3.0

SS0BM-04
- SERVICE SPECIFICATIONSAUTOMATIC TRANSAXLE
SS-25
141 Author
: Date
:
2001 AVALON (RM808U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
Front side engine mounting insulator x Front frame assembly8082059
Rear engine mounting insulator x Front frame assembly6667048
LH transaxle mounting insulator x Front frame assembly8082059
Engine mounting insulator x Front frame assembly4849035
Transaxle x Engine 17 mm bolt
14 mm bolt66
48670
49048
35
Torque converter clutch x Drive plate4142030
Valve body x Transaxle case1111 08
Oil strainer x Valve body Bolt A
(See page AX-35) Bolt B10
11100
11 07
8
Oil pan x Transaxle case7.88069 in.´lbf
Oil pan drain plug4950036
Park/Neutral position switch x Transaxle case Bolt
Nut5.4
6.955
7048 in.´lbf
61 in.´lbf
Connector clamp x Valve body6.66758 in.´lbf
Manual valve body x Transaxle case1111 08
Line pressure test plug x Transaxle case7.58069 in.´lbf
Detent spring x Manual valve body1111 08
Oil pipe bracket x Transaxle case101007
Steering gear housing x Front frame assembly1811,850134
Stabilizer bar bracket x Front frame assembly1919514
Stabilizer bar link x Stabilizer bar3940029
Lower suspension arm x Lower ball joint1271,30094
Tie rod end x Steering knuckle4950036
Drive shaft lock nut2943,000217
Direct clutch speed sensor x Transaxle case1111 08
Exhaust manifold bracket x Transaxle case2020015
Exhaust manifold plate2020015
Front frame assembly x Body 19 mm bolt
14 mm bolt
Nut181
32
361,850
330
370134
24
27
Front exhaust pipe x Exhaust center pipe4344032
Exhaust manifold x Front exhaust pipe6263046
Exhaust front pipe support stay x Exhaust front pipe support bracket3333024
Starter x Torque converter clutch housing3940029
Transaxle control shaft lever x Park/neutral position switch1515011
Throttle cable adjusting nut1515011
Drive plate x Crankshaft8385061
Shift control cable x Transaxle control shaft lever1515011
Throttle cable retaining plate set bolt5.45548 in.´lbf
Shift solenoid valve No. 1, No. 2, SL, SLN x Valve body6.66758 in.´lbf
Front wheel nut1031,05076
Exhaust front pipe support bracket x Body2121015
PS reservoir pipe x Front frame101007