Lexus RX300 (MCU15). Manual — part 259
DI–268
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
3
Check for open or short circuit in harness and connector between deceleration
sensor and skid control ECU (See page IN–32).
NG
Repair or replace harness or connector.
OK
Check and replace skid control ECU.
F06955
Deceleration Sensor
Skid Control ECU
GL1
(Shielded)
1
VGS
GSS
A22
GL2
GGND
GGND
GL2
GL1
VGS
2
9
10
18
1
2
3
5
B
W
R
G
A22
A22
A22
A22
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–269
LEXUS RX300 (RM785E)
DTC
C1244 / 44
Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS & BA & TRC & VSC con-
trol. If the sensor functions abnormally, the ABS warning light comes on.
DTC No.
DTC Detecting Condition
Trouble Area
C1244 / 44
Either of the following 1., 2., 3. or 4. is detected:
1. The condition that ECU terminals GL1 and GL2 G conver-
sion values are –1.5 G or less or 1.5 G or more continues
for 1.2 sec. or more.
2. The condition that the deceleration sensor terminal VGS
voltage is 4.4 V or less or 5.6 V or more continues for 1.2
sec. or more.
3. At the vehicle speed of 0 km/h (0 mph), after the difference
of output absolute value of G conversion value between
deceleration sensor terminals GL1 and GL2 becomes 0.6 G
or more, and the condition that does not become 0.4 G con-
tinues for 60 sec. or more.
4. Deceleration sensor signal momentary open occurs for 7
times or more.
S Deceleration sensor
S Deceleration sensor circuit
WIRING DIAGRAM
DI1GM–06
DI–270
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check for open and short circuit in harness and connector between deceleration
sensor and skid control ECU (See page IN–32).
NG
Repair or replace harness or connector.
OK
2
Check deceleration sensor (See page DI–205).
NG
Replace deceleration sensor.
OK
Check and replace skid control ECU.
F06952
Master Cylinder
Pressure Sensor
Skid Control ECU
FSS
VCM
E2
22
PMC
10
23
1
2
3
24
VCM
PMC
E2
A21
(Shielded)
B
W
R
A21
A21
A21
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–271
LEXUS RX300 (RM785E)
DTC
C1246 / 46
Master Cylinder Pressure Sensor
Circuit
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1246 / 46
Either of the following 1., 2., 3., 4. or 5. is detected:
1. When the vehicle speed is 7 km/h (4.3 mph) and ECU
terminal PMC voltage is 0.86 V or more, the condition
that the terminal voltage does not change by more than
0.005 V continues for 30 sec.
2. The noise to ECU terminal PMC occurs 7 times for 5
secs.
3. When ECU terminal STP is OFF, the condition that ECU
terminal PMC voltage is 0.86 or more or 0.3 V or less
continues for more than 5 sec.
4. When the ECU terminal IG1 is 9.5 V to 17.2 V the condi-
tion that ECU terminal VCM voltage is out of range of
4.4 V to 5.6 V continues for 1.2 sec.
5. When ECU terminal VCM voltage is 4.4 V to 5.6 V the
condition that ECU terminal PMC voltage is out of range
of 0.14 V to 4.85 V continues for more than 1.2 sec.
S Master cylinder pressure sensor
S Master cylinder pressure sensor circuit
WIRING DIAGRAM
DI1GN–06
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