TOYOTA AVALON 2001 Service Repair Manual
Page 721 of 1897
DI-260
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
416 Author: Date:
2001 AVALON (RM808U)
DTC chart of translate ECU(output NG code DTC of VSC system C1301/42 only):
DTC No.
(See Page)Detection ItemTrouble Area
Normal code*
(DI-317)Malfunction in ECM control system
ECM circuit
ECM
Brake fluid level
Brake fluid level warning switch circuit
Steering angle sensor
ABS & BA & TRAC & VSC ECU
42
(DI-31 1)Malfunction in communication with the ABS & BA & TRAC &
VSC ECUVSC+ or VSC- circuit
Translate ECU
ABS & BA & TRAC & VSC ECU
44
(DI-313)Open or short circuit in NEO circuit
NEO circuit
ECM
Translate ECU
53
(DI-315)Malfunction in communication with the ECM
TRC+ or TRC- circuit
ENG+ or ENG- circuit
ECM
Translate ECU
Non code
(DI-318)Malfunction in translate ECU
Tc terminal circuit
BRAKE warning light circuit
Translate ECU
*: Translate ECU is normal.
HINT:
The BRAKE warning light does not turn on due to an error in VSC.
If it is on, check that the parking brake pedal is released, the brake fluid level is normal and no malfunction
is identified in the fluid level warning switch system.
Page 722 of 1897
DI6NQ-01
Vehicle Brought to Workshop
Customer Problem Analysis
P. DI-251
Check and Clear DTC (Precheck)
P. DI-252Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation
P. IN-20
Symptom
does not occur
Symptom
occurs
DTC Check
P. DI-252
Sensor CheckCircuit Inspection
P. DI-267 - DI-344
DTC Chart
P. DI-258 Malfunction codeProblem Symptoms Table
P. DI-266
Check for Fluid Leakage
P. DI-346
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
67
89
10
11
Fail safe function:
When a failure occurs in the ABS & BA & TRAC & VSC system, the respective warning light (ABS, VSC) is lit and
the operation of ABS & BA & TRAC & VSC is prohibited. In addition to this, when the failure which disables the EBD
operation occurs, the brake warning light is lit as well and the EBD operation is prohibited.Step 2, 5, 8, 9, 11:Diagnostic steps permitting the use of the
TOYOTA hand-held tester or TOYOTA
break-out-box. DI-250
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
406 Author: Date:
2001 AVALON (RM808U)
ABS WITH EBD & BA & TRAC & VSC SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the procedure on the following pages.
Page 723 of 1897
DI6NU-01
F07883
ABS Warning Light
VSC Warning Light
VSC OFF Indicator Light
SLIP Indicator Light
BRAKE Warning Light
DLC2Rear Speed Sensor
Sensor Rotor
Brake Actuator
ABS & BA & TRAC & VSC ECU
VSC OFF Switch Front Speed Sensor
DLC1
ABS Solenoid RelayABS Motor Relay
Room R/B No. 8 Engine
Precharge PumpMaster Cylinder
Pressure Sensor
Parking Brake Switch
Stop Light Switch
Translate ECU
Front Speed Sensor
Sensor Rotor
Sensor Rotor
Rear Speed Sensor
DLC3
Steering Angle Sensor
Yaw Rate Sensor
(Including Deceleration Sensor)
Active Lamp Relay
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-261
417 Author: Date:
2001 AVALON (RM808U)
PARTS LOCATION
Page 724 of 1897
F07880
DI6NS-01
F02201Tc E
1DLC1
DI-252
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
408 Author: Date:
2001 AVALON (RM808U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Check the warning lights.
(1) Release the parking brake pedal.
(2) When the ignition switch is turned ON, check that
the ABS warning light, VSC warning light, VSC OFF
indicator light, BRAKE warning light and SLIP indi-
cator light goes on for approx. 3 seconds.
HINT:
When the parking brake is applied or the level of the brake
fluid is low, the BRAKE warning light is lit.
If the indicator check result is not normal, proceed to trou-
bleshooting for the ABS warning light circuit, VSC warn-
ing light circuit, VSC OFF indicator light circuit, BRAKE
warning light circuit or SLIP indicator light circuit.
Trouble AreaSee page
ABS warning light circuitDI-325
VSC warning light circuitDI-327
VSC OFF indicator light circuitDI-336
BRAKE warning light circuitDI-330
SLIP indicator light circuitDI-333
(b) In case of not using TOYOTA hand-held tester:
Check the DTC of ABS & BA & TRAC & VSC ECU.
(1) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(2) Turn the ignition switch ON.
(3) Read the DTC from the ABS warning light and VSC
warning light on the combination meter.
HINT:
If no code appears, inspect the diagnostic circuit, ABS
warning light circuit or VSC waning light circuit.
Trouble AreaSee page
Tc terminal circuitDI-342
ABS warning light circuitDI-325
VSC warning light circuitDI-327
Page 725 of 1897
R01346
Normal Code
0.25 sec.
0.25 sec. 2 sec.
ON
OFF
ON
OFF0.5 sec. 0.5 sec.
Code 11 and 21
4 sec.1.5 sec.
2.5 sec.
Code 11 Code 21
F02201
DLC1 E
1Tc
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-253
409 Author: Date:
2001 AVALON (RM808U)
As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(4) Codes are explained in the code table on page
DI-258.
(5) After completing the check, disconnect terminals Tc
and E
1, and turn off the display.
If 2 or more malfunction codes are identified at the same time,
the lowest numbered DTC will be displayed 1st.
(c) In case of not using TOYOTA hand-held tester:
Check the DTC of translate ECU.
(1) Release the parking brake pedal.
(2) Check the brake fluid level.
(3) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(4) Turn the ignition switch ON.
(5) Read the DTC from the BRAKE warning light.
HINT:
If no code appears, inspect the diagnostic circuit, and
BRAKE warning light circuit.
Trouble AreaSee page
Tc terminal circuitDI-342
BRAKE warning light circuitDI-330
When the parking brake is applied or the level of the brake
fluid is low, the BRAKE warning light is lit.
If every sensor is normal, a normal code is output. (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated.)
If 2 or more malfunction codes are identified at the same
time, the lowest numbered code will be displayed 1st.
Page 726 of 1897
Malfunction Code (Example Code 42, 44)
ON
OFF
0.5 sec.0.5 sec.
1.5 sec.2.5 sec.
4 sec.
Repeat
42
44
F07887
TOYOTA Hand-
held Tester
DLC3
BR3890
F07887
TOYOTA Hand-
held Tester
DLC3 DI-254
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
410 Author: Date:
2001 AVALON (RM808U)
(d) In case of using TOYOTA hand-held tester:
Check the DTC.
(1) Hook up the TOYOTA hand- held tester to the
DLC3.
(2) Turn the ignition switch ON.
(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.
(e) In case of not using TOYOTA hand-held tester:
Clear the DTC.
(1) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(2) Turn the ignition switch ON.
(3) Clear the DTC stored in ECU by depressing the
brake pedal 8 times or more within 5 seconds.
(4) Check that the warning light shows the normal
code.
(5) Remove the SST from the terminals of DLC1.
SST 09843-18020
HINT:
Cancellation cannot be done by removing the battery cable or
ECU-IG fuse.
(f) In case of using TOYOTA hand-held tester:
Clear the DTC.
(1) Hook up the TOYOTA hand- held tester to the
DLC3.
(2) Turn the ignition switch ON.
(3) Operate the TOYOTA hand-held tester to erase the
codes.
HINT:
Please refer to the TOYOTA hand-held tester operator's manu-
al for further details.
Page 727 of 1897
F02201
DLC1
TsTc E
1
BR3904
0.13 sec. 0.13 sec.
ON
OFF
BR3893
Malfunction Code (Example Code 72, 76)
72 67
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec.
2.5 sec.4 sec.
Repeat
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-255
411 Author: Date:
2001 AVALON (RM808U)
2. SPEED SENSOR SIGNAL CHECK (TEST MODE)
(a) In case of not using TOYOTA hand-held tester:
Check the sensor signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E
1 of DLC1.
SST 09843-18020
(3) Start the engine.
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit (See page DI-325).
(5) Drive vehicle straight forward.
Drive vehicle at a speed faster than 45 km/h (28
mph) for several seconds.
HINT:
The sensor check may not be completed if the front wheels are
spun or the steering wheel is steered during this check.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(8) Read the number of blinks of the ABS warning light.
HINT:
See the list of DTC shown on the next page.
If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).
If 2 or more malfunction codes are identified at the same
time, the lowest numbered code will be displayed 1st.
(9) After doing the check, disconnect the SST from ter-
minals Ts and E
1, Tc and E1 of DLC1, and turn the
ignition switch OFF.
SST 09843-18020
Page 728 of 1897
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.
Page 729 of 1897
F09479
IGAGND
Lean to LeftLean to Right GL1
Front
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-257
413 Author: Date:
2001 AVALON (RM808U)
HINT:
If the off center angle is greater than 3 degrees from center, fur-
ther adjustments to the tie rods may be necessary.
(d) Shift the gear selector switch to the P range.
(e) Press the VSC OFF switch and hold it while depressing
the brake pedal 3 times within 2 seconds.
(f) Continue to hold the VSC OFF switch until the VSC buzz-
er (repeated beeping) sounds.
(g) Release the VSC OFF switch. The VSC buzzer will con-
tinue to sound for 3 seconds confirming the operation is
complete.
HINT:
If the procedure is done correctly and VSC buzzer does not
sound, there may be a malfunction of the steering angle sensor.
4. DECELERATION SENSOR CHECK
(a) Apply battery positive voltage.
(b) Connect IGA terminal to the battery positive (+) terminal,
and GND terminal to the battery negative (-) terminal, and
apply about 12 V between IGA and GND terminals.
(c) Check the output voltage of GL1 terminal.
SymbolsConditionStandard Value
GL1HorizontalAbout 2.5 V
GL1Lean right downAbout 2.3 V - 4V
GL1Lean left down1 V - About 2.3 V
HINT:
If the sensor is tilted too much, it may show the wrong val-
ue.
If dropped, the sensor should be replaced with a new one.
The sensor removed from the vehicle should not be
placed upside down.
Page 730 of 1897
DI6NW-01
DI-266
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
422 Author: Date:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTICE:
When replacing ABS & BA & TRAC & VSC ECU, sensor, etc., turn the IG switch OFF.
SymptomSuspect AreaSee page
ABS does not operate
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS & BA & TRAC & VSC ECU.
4. Check the DTC, reconfirming that the normal code is
output.
5. IG power source circuit
6. Speed sensor circuit
7. Check the brake actuator with a hand-held tester.
If abnormal, check the hydraulic circuit for leakage
(See page DI-346).
DI-252
DI-297
DI-267
BR-52
ABS does not operate efficiently
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS & BA & TRAC & VSC ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the brake actuator with a hand-held tester.
If abnormal, check the hydraulic circuit for leakage
(See page DI-346).
DI-252
DI-267
DI-303
BR-52
ABS warning light abnormal1. ABS warning light circuit
2. ABS & BA & TRAC & VSC ECUDI-325
DTC check cannot be done
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS & BA & TRAC & VSC ECU.
1. ABS warning light circuit
2. VSC warning light circuit
3. Tc terminal circuit
DI-325
DI-327
DI-342
Speed sensor signal check cannot be done1. Ts terminal circuit
2. ABS & BA & TRAC & VSC ECUDI-344
VSC does not operate
Only when circuits inspected for each problem symptom
are all normal and the problem is still occurring, replace the
ABS & BA & TRAC & VSC ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. IG power source circuit
3. Hydraulic circuit for leakage
4. Speed sensor circuit
DI-252
DI-297
DI-346
DI-267
BA does not operateStop light switch circuitDI-303
SLIP indicator light abnormalSLIP indicator light circuitDI-333
BRAKE warning light abnormal1. BRAKE warning light circuit
2. ABS & BA & TRAC & VSC ECUDI-330
VSC OFF indicator light abnormal
Only when circuits inspected for each problem symptom
are all normal and the problem is still occurring, replace the
ABS & BA & TRAC & VSC ECU.
1. VSC OFF indicator light circuit
2. VSC OFF switch circuit
DI-336
DI-336