2001 TOYOTA AVALON brake sensor

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

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.

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.

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

DI4DO-02
A00022
4-pulse
Combination
MeterECM 4-pulse
From
Speed SensorABS ECU DI-178
- DIAGNOSTICSAUTOMATIC TRANSAXLE
334 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC P0500 Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
The speed sensor for ABS detects the wheel speed and sends the appropriate signals to the ABS ECU.
The ECU converts these signals in to a 4-pulse signal and outputs it to the combination meter.
After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit in-
side the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based
on the frequency of these pulse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
Satisfying all of the following conditions, 2 sec. (Intake air tem-
perature: -10 °C or more) or 8 sec. (Intake air temperature:
less than -10 °C) elapsed.
(c) After 2 sec. (the engine coolant temperature: 20 °C or
more) or 30 sec. (the engine coolant temperature: less than
20 °C) with the park/neutral position switch set to P, N posi-
tion.
(d) No abnormality of the throttle position sensor is detected.
(e) After 0.5 sec. or more with the ignition switch turned ON.
(f) No vehicle speed is signal to ECM.
(g) The engine rpm is equal to the speed sensor rpm or more
when the throttle opening angle is as shown below.
1. The throttle opening angle is less than 13° and the engine
rpm is 2,350 or more.
2. The throttle opening angle is less than 21° and the engine
rpm is 2,680 or more.
3. The throttle opening angle is less than 30° and the engine
rpm is 2,835 or more.
4. The throttle opening angle is less than 30° and the engine
rpm is 3,145 or more.

Open or short in vehicle speed sensor circuit

ABS speed sensor

Combination meter

ECM

ABS ECU

Automatic transaxle (clutch, brake or gear etc.)
Clutch or brake slips or gear is broken (2-trip detection logic)

Q30002
(-)(+)
(-)(+)
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-181
337 Author
: Date
:
2001 AVALON (RM808U)
DTC P0750, P0755 Shift Solenoid A/B Malfunction
(Shift Solenoid Valve No.1/No.2)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor and direct clutch speed sensor to detect the actual
gear position (1st, 2nd, 3rd or O/D gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
trouble of the shift solenoid valves, valve body or automatic transaxle (clutch, brake or gear etc.).
DTC No.DTC Detecting ConditionTrouble Area
P0750
P0755During normal driving, the gear required by the ECM does not
match the actual gear
(2-trip detection logic)
Shift solenoid valve No.1/No.2 is stuck open or closed

Valve body is blocked up or stuck

Automatic transaxle (clutch, brake or gear etc.)
HINT:
Check the shift solenoid valve No.1 when DTC P0750 is output and check the shift solenoid valve No.2 when
DTC P0755 is output.
INSPECTION PROCEDURE
1 Check shift solenoid valve No.1 or No.2 operation.
PREPARATION:
(a) Remove the oil pan.
(b) Remove the shift solenoid valve No.1 or No.2.
CHECK:
(a) Applying 490 kPa (5 kgf/cm2, 71 psi) of compressed air,
check that the solenoid valve does not leak air.
(b) When battery positive voltage is supplied to the shift sole-
noid valve, check that the valve opens.
OK:
(a) Solenoid valve does not leak air.
(b) Solenoid valve opens.
NG Replace the shift solenoid valve No.1 or No.2.
OK
DI02K-08

Q04874
Controlled
Pressure
Drain Controlled
Pressure Line
Pressure
Q08040D02461
(+)
(+)
(-) (-)
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-187
343 Author
: Date
:
2001 AVALON (RM808U)
DTC P0770 Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, air-
flow meter and crankshaft position sensor to monitor the en-
gagement condition of the lock-up clutch.
Then the ECM compares the engagement condition of the
lock-up clutch with the lock-up schedule in the ECM memory
to detect mechanical trouble of the shift solenoid valve SL,
valve body, torque converter clutch or automatic transaxle
(clutch, brake or gear etc.).
DTC No.DTC Detecting ConditionTrouble Area
P0770

Lock-up does not occur when driving in the lock-up range
(normal driving at 80 km/h [50 mph]), or lock-up remains ON
in the lock-up OFF range.
(2-trip detection logic)

When lock-up is ON, clutch or brake slips or gear is broken.
Shift solenoid valve SL is stuck open or closed

Valve body blocked up or stuck

Lock-up clutch

Automatic transaxle (clutch, brake or gear etc.)
INSPECTION PROCEDURE
1 Check solenoid valve SL operation.
PREPARATION:
(a) Remove the oil pan.
(b) Remove the shift solenoid valve SL.
CHECK:
(a) Applying 490 kPa (5 kgf/cm2, 71 psi) of compressed air,
check that the solenoid valve does not leak air.
(b) When battery positive voltage is supplied to the shift sole-
noid valve, check that the solenoid valve opens.
OK:
(a) Solenoid valve does not leak air.
(b) Solenoid valve opens.
NG Replace the solenoid valve SL.
OK
DI02M-08

DI02F-06
DI-172
- DIAGNOSTICSAUTOMATIC TRANSAXLE
328 Author
: Date
:
2001 AVALON (RM808U)
DIAGNOSTIC TROUBLE CODE CHART
If a DTC is displayed during the DTC check, check the circuit listed for that code in the table below and pro-
ceed to the page given.
*:
...MIL lights up
DTC No.
(See Page)Detection ItemTrouble AreaMIL *Memory
P0500
(DI-178)Vehicle Speed Sensor Malfunc-
tion
(Vehicle Speed Sensor)
Open or short in vehicle speed sensor circuit
Vehicle speed sensor
Combination meter
ECM
Automatic transaxle (clutch, brake or gear etc.)


P0750
(DI-181)Shift Solenoid A Malfunction
(Shift Solenoid Valve No.1)Shift solenoid valve No.1 is stuck open or closed
Valve body is blocked up or stuck
Automatic transaxle (clutch, brake or gear etc.)


P0753
(DI-183)Shift Solenoid A Electrical Mal-
function
(Shift Solenoid Valve No.1)Open or short in shift solenoid valve No.1 circuit
Shift solenoid valve No.1
ECM


P0755
(DI-181)Shift Solenoid B Malfunction
(Shift Solenoid Valve No.2)Shift solenoid valve No.2 is stuck open or closed
Valve body is blocked up or stuck
Automatic transaxle (clutch, brake or gear etc.)


P0758
(DI-183)Shift Solenoid B Electrical Mal-
function
(Shift Solenoid Valve No.2)Open or short in shift solenoid valve No.2 circuit
Shift solenoid valve No.2
ECM


P0770
(DI-187)Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)
Shift solenoid valve SL is stuck open or closed
Valve body is blocked up or stuck
Lock-up clutch
Automatic transaxle (clutch, brake or gear etc.)


P0773
(DI-189)Shift Solenoid E Electrical Mal-
function
(Shift Solenoid Valve SL)Open or short in shift solenoid valve SL circuit
Shift solenoid valve SL
ECM


P1520
(DI-192)Stop Light Switch Signal Mal-
functionOpen or short in stop light switch circuit
Stop light switch
ECM


P1705
(DI-193)NC2 Revolution Sensor Circuit
Malfunction
(Direct Clutch Speed Sensor)Open or short in direct clutch speed sensor circuit
Direct clutch speed sensor
ECM


P1765
(DI-195)
Linear Solenoid for Accumulator
Pressure Control Circuit Mal-
function
(Shift Solenoid Valve SLN)Open or short in shift solenoid valve SLN circuit
Shift solenoid valve SLN
ECM


P1780
(DI-199)Park/Neutral Position Switch
MalfunctionShort in park/neutral position switch circuit
Park/neutral position switch
ECM