Toyota Sequoia (2005). Manual — part 277
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI–903
1097
HINT:
If the VSC buzzer sounds twice, the sensor check has
been completed normally.
If the VSC buzzer does not sound, check the VSC buzzer
circuit (see page
again.
Drive the vehicle through 180
°
. At the end of the turn its
check, the direction of the vehicle should be within 180
°
±
5
° of its start position.
Do not spin the wheels.
If the buzzer sounds after start off, then the deceleration
sensor check has passed its check. If the buzzer sounds
at the completion of a turn its check, then the yaw rate
sensor check has passed. The buzzer sound should be
heard during the sensor checks.
(c)
Check the master cylinder pressure sensor.
(1)
Turn the ignition switch to the ON position.
(2)
Keep the vehicle in a stationary condition on a level
surface for 2 sec. or more.
(3)
Keeping the vehicle in a stationary condition and
not pressing on the brake pedal for 1 sec. or more,
depress the brake pedal with 147 N (15 kgf, 33 lbf)
or more for 2 sec. or more on a new ECU.
NOTICE:
If zero point calibration has never been performed on a new
ECU, master cylinder pressure sensor check cannot be
completed correctly. Perform zero point calibration first
(See page
HINT:
At this time, the buzzer sounds for 3 seconds.
(d)
Check the speed sensor.
Drive the vehicle straight forward.
When driving the vehicle at the speed of 28 mph (45 km/h)
or higher for several seconds, check that the ABS warn-
ing light goes off.
HINT:
There is a case that the sensor check is not completed if the ve-
hicle has its wheels spun or its steering wheel turned during this
check.
(e)
Stop the vehicle.
(f)
Read the DTC by following the prompts on the tester
screen.
HINT:
Refer to the hand–held tester operator’s manual for further de-
tails.
DI–904
–
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
1098
3.
DTC of ABS sensor check function:
Code No.
Diagnosis
Trouble Area
C1271 / 71
Low output voltage of right front speed sensor
Right front speed sensor
Sensor installation
Sensor rotor
C1272 / 72
Low output voltage of left front speed sensor
Left front speed sensor
Sensor installation
Sensor rotor
C1273 / 73
Low output voltage of right rear speed sensor
Right rear speed sensor
Sensor installation
Sensor rotor
C1274 / 74
Low output voltage of left rear speed sensor
Left rear speed sensor
Sensor installation
Sensor rotor
C1275 / 75
Abnormal change in output voltage of right front speed sen-
sor
Right front speed sensor rotor
C1276 / 76
Abnormal change in output voltage of left front speed sen-
sor
Left front speed sensor rotor
C1277 / 77
Abnormal change in output voltage of right rear speed sen-
sor
Right rear speed sensor rotor
C1278 / 78
Abnormal change in output voltage of left rear speed sensor
Left rear speed sensor rotor
C1279 / 79
Deceleration sensor is faulty
Deceleration sensor
Sensor installation
C1281 / 81
Master cylinder pressure sensor output signal is faulty
Master cylinder pressure sensor
HINT:
Read the number of blinks of the ABS warning light.
DTC of VSC sensor check function:
Code No.
Diagnosis
Trouble Area
C0371 / 71
Yaw rate sensor output signal malfunction
Yaw rate sensor
Yaw rate sensor circuit
HINT:
Read the number of blinks of the VSC TRAC warning light.
DI93F–04
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI–905
1099
PROBLEM SYMPTOMS TABLE
If a normal code is indicated 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 the skid control ECU, sensor, etc., turn the ignition switch OFF.
When replacing the master cylinder pressure, yaw rate and deceleration sensors and/or the
ECU, make sure to perform master cylinder pressure, yaw rate, and deceleration sensors’ zero
point calibration (See page
Symptom
Suspected Area
See page
ABS does not operate
When the following 1. to
4. are all normal and the problem
is still occurring, replace the skid control ECU.
1. Check the DTC reconfirming that the normal code is
output.
2. IG power source circuit
3. Speed sensor circuit
4. Check the hydraulic circuit for leakage.
ABS does not operate efficiently
When the following 1. to 4. are all normal and the problem
is still occurring, replace the skid control ECU.
1. Check the DTC reconfirming that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the hydraulic circuit for leakage.
ABS warning light abnormal
1. ABS warning light circuit
2. Skid control ECU
BRAKE warning light abnormal
1. BRAKE warning light circuit
2. Skid control ECU
3. Translate ECU
or
DTC check cannot be done
When the following 1. to 3. are all normal and the problem
is still occurring, replace the skid control ECU.
1. ABS warning light circuit
2. Tc terminal circuit
3. VSC TRAC warning light circuit
or
Speed sensor signal check cannot be done
1. Ts terminal circuit
2. Skid control ECU
TRAC does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. IG power source circuit
3. Check the hydraulic circuit for leakage
4. Speed sensor circuit
TRAC does not operate efficiently
Only when 1. to 3. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. Check the hydraulic circuit for leakage
3. Speed sensor circuit
DI–906
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
1100
VSC does not operate
Only when 1. to 9. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. Perform zero point calibration
3. IG power source circuit
4. Check the hydraulic circuit for leakage
5. Speed sensor circuit
6. Deceleration sensor circuit
7. Yaw rate sensor circuit
8. Steering angle sensor circuit
9. Master cylinder pressure sensor circuit
VSC does not operate efficiently
Only when 1. to 8. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. Perform zero point calibration
3. Check the hydraulic circuit for leakage
4. Speed sensor circuit
5. Deceleration sensor circuit
6. Yaw rate sensor circuit
7. Steering angle sensor circuit
8. Master cylinder pressure sensor circuit
VSC TRAC warning light abnormal
1. VSC TRAC warning light circuit
2. Skid control ECU
or
SLIP indicator light abnormal
1. SLIP indicator light circuit
2. Skid control ECU
VSC OFF (TRAC OFF) indicator abnormal
1. VSC OFF (TRAC OFF) indicator light circuit
2. VSC OFF (TRAC OFF) switch circuit
3. Skid control ECU
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