Lexus SC300 / Lexus SC400. Service manual — part 278
![](/vehicle/tus/kendre/chaul/awen.png)
DTC
62
TRAC Vehicle Speed Malfunction
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
62
Detection of any of conditions (1) through (3):
At vehicle speed of 10 km/h (6 mph) or more, pulses
are not input for 5 sec.
ECU
HINT: When DTC Nos. 31–36 are recorded in memory, DTC No. 62 is not recorded.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
BR–140
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
–MEMO–
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
BR–141
![](/vehicle/tus/kendre/chaul/kosh.png)
).
).
).
WIRING DIAGRAM
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
The stop light switch senses whether the brake pedal is depressed or released, and sends a signal to the ECU.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
BR–142
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
![](/vehicle/tus/kendre/chaul/nune.png)
OK
NG
NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check operation of stop light.
Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is re-
leased.
C
Repair stop light circuit (See page
2
Check voltage between terminal STP of ABS (& TRAC) ECU and body ground.
C
OK
P
Remove ABS (& TRAC) ECU with connectors still con-
nected.
Measure voltage between terminal STP of ABS (&
TRAC) ECU and body ground when brake pedal is de-
pressed.
Voltage:
8 – 14 V
Proceed to next circuit inspection shown on problem
symptoms chart (See page
).
3
Check for open in harness and connector between ABS (& TRAC) ECU and stop light switch
(See page
Repair or replace harness or connector.
Check and replace ABS (& TRAC) ECU.
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
BR–143
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