Lexus SC300 / Lexus SC400. Service manual — part 235
WIRING DIAGRAM
DIAGNOSTIC CHART
DIAGNOSTIC CHART
–
BRAKE SYSTEM
TRACTION CONTROL SYSTEM (TRAC)
BR–191
WIRING DIAGRAM
DTC
41
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU and becomes power source for the CPU and actuators.
DTC No.
DTC Detecting Condition
Trouble Area
41
When either of the following (1) or (2) is detected:
(1) Voltage at ECU terminal IG is less than 9.5 V for
more than 10 sec. while engine speed is 500 rpm
or higher.
(2) Voltage at ECU terminal IG is more than 17 V for
more than 5 sec.
Battery
IC regulator
Open or short in power source circuit
ECU
Fail safe function: If trouble occurs in the power source circuit, the ECU prohibits TRAC control.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
BR–192
–
BRAKE SYSTEM
TRACTION CONTROL SYSTEM (TRAC)
OK
NG
NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check battery positive voltage.
Voltage:
10 – 14 V
C
OK
Check and repair the charging system.
2
Check voltage between terminals IG and GND of TRAC ECU connector.
C
OK
P
1.
Remove TRAC ECU with connectors still con-
nected.
2.
Turn ignition switch on.
Measure voltage between terminals IG and GND of
TRAC ECU connector.
Voltage:
10 – 14 V
Check and replace TRAC ECU.
3
Check continuity between terminals GND of TRAC ECU connector and body ground.
C
OK
Measure resistance between terminal GND or TRAC
ECU connector and body ground.
Resistance:
1
or less
Repair or replace harness or connector.
–
BRAKE SYSTEM
TRACTION CONTROL SYSTEM (TRAC)
BR–193
OK
NG
4
Check ECU–IG fuse.
C
OK
P
Remove ECU–IG fuse from J/B No. 1.
Check continuity of ECU–IG fuse.
Continuity
Check for short in all the harness and components con-
nected to ECU–IG fuse (See attached wiring diagram).
Check for open in harness and connector between
TRAC ECU and battery (See page
).
BR–194
–
BRAKE SYSTEM
TRACTION CONTROL SYSTEM (TRAC)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст