Lexus SC300 / Lexus SC400. Service manual — part 263

SPEED SENSOR SIGNAL CHECK

Turn the ignition switch to OFF.

Using SST, connect terminals Ts and E1 of DLC1.
SST 09843–18020

Start the engine.

Check that the ABS warning light blinks.
HINT: If the ABS warning light does not blink, inspect the ABS
warning light circuit (see page

BR–144

Drive vehicle straight forward.
HINT: Drive vehicle faster than 45 km/h (28 mph) for several
seconds.

Stop the vehicle.

Using SST, connect terminals Tc and E1 of DLC1.
SST 09843–18020

Read the number of blinks of the ABS warning light.
HINT: See the list of diagnosis trouble codes 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 are indicated at the same time, the
lowest numbered code will be displayed 1st.

After performing the check, disconnect terminals Ts and E1,
Tc and E1 of DLC1, and ignition switch turned off.

BR–80

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

ECU DATA MONITOR USING LEXUS HAND–HELD TESTER
1.

Hook up the LEXUS hand–held tester to the DLC2.

Monitor the ECU data by following the prompts on the tester
screen.
HINT: LEXUS hand–held tester has a “Snapshot” function
which records the monitored data.
Please refer to the LEXUS hand–held tester operator’s
manual for further details.

Diagnostic Trouble Code of Speed Sensor Check Function

ÑÑÑÑÑÑ

Code No.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Diagnosis

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Trouble Area

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Low output voltage of right front speed sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Right front speed sensor

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Low output voltage of right front speed sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Sensor installation

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Low output voltage of left front speed sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Left front speed sensor

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Low output voltage of left front speed sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Sensor installation

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Low output voltage of right rear speed sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Right rear speed sensor

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Low output voltage of right rear speed sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Sensor installation

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Low output voltage of left rear speed sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Left rear speed sensor

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Low output voltage of left rear speed sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Sensor installation

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Abnormal change in output voltage of right front speed
sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Right front speed sensor rotor

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Abnormal change in output voltage of left front speed
sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Left front speed sensor rotor

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Abnormal change in output voltage of right rear speed
sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Right rear speed sensor rotor

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Abnormal change in output voltage of left rear speed
sensor

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Left rear speed sensor rotor

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

BR–81

PROBLEM SYMPTOMS CHART

If a normal code is displayed during the diagnostic trouble code 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 page for
troubleshooting.

ÑÑÑÑÑÑÑÑ

Symptoms

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Inspection Circuit

ÑÑÑÑÑÑÑÑÑ

See page

ÑÑÑÑÑÑÑÑ

ABS does not oper-
ate.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Only when 1.–4. are all normal and the problem is still occurring,
replace the ABS (& TRAC) ECU.

ÑÑÑÑÑÑÑÑÑ

BR–76

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

1. Check the diagnostic trouble code, reconfirming that the nor-

mal code is output.

ÑÑÑÑÑÑÑÑÑ

BR–122
BR–118

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

2. IG Power Source Circuit.

ÑÑÑÑÑÑÑÑÑ

BR–65

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

3. Speed sensor circuit.

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

4. Check the ABS actuator with a checker.

If abnormal, check the hydraulic circuit for leakage (see page
BR–138).

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑ

ABS does not oper-
ate efficiently.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Only when 1.–4. are all normal and the problem is still occurring,
replace the ABS (& TRAC) ECU.

ÑÑÑÑÑÑÑÑÑ

BR–76

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Check the diagnostic trouble code, reconfirming that the nor-
mal code is output.

ÑÑÑÑÑÑÑÑÑ

BR–118

BR–142

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

2. Speed sensor circuit.

ÑÑÑÑÑÑÑÑÑ

BR–65

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

3. Stop light switch circuit

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Check the ABS actuator with a checker.

If abnormal, check the hydraulic circuit for leakage (see page
BR–138).

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑ

ABS warning light ab-
normal.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

1. ABS warning light circuit.

ÑÑÑÑÑÑÑÑÑ

BR–144

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

2. ABS (& TRAC) ECU.

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑ

Diagnostic trouble
code check cannot
be performed.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Only when 1. and 2. are all normal and the problem is still occur-
ring, replace the ABS (& TRAC) ECU.

ÑÑÑÑÑÑÑÑÑ

BR–144

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

1. ABS warning light circuit

ÑÑÑÑÑÑÑÑÑ

BR–148

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

2. To terminal circuit.

ÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑ

Speed sensor signal
check cannot be per-
formed.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

1. Ts terminal circuit.

ÑÑÑÑÑÑÑÑÑ

BR–150

ÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

2. ABS (& TRAC) ECU.

ÑÑÑÑÑÑÑÑÑ

BR–82

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

–MEMO–

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

BR–83

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Lexus SC300 / Lexus SC400. Service manual — part 263

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