Lexus RX300 (MCU15). Manual — part 258
F05273
Instrument Panel J/B
ECU–IG Fuse
DI–264
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check ECU–IG fuse.
PREPARATION:
Remove the ECU–IG fuse from instrument panel J/B.
CHECK:
Check continuity of ECU–IG fuse.
OK:
Continuity
NG
Check for short circuit in all the harness and
components connected to ECU–IG fuse (See
attached wiring diagram).
OK
2
Check battery voltage.
CHECK:
Check the battery voltage.
OK:
Voltage: 10 – 14 V
NG
Check and repair the charging system (See
page CH–2).
OK
GND4
F09165
ON
GND1
GND2
IG1
GND3
(+)
(–)
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–265
LEXUS RX300 (RM785E)
3
Check voltage of the ECU–IG power source.
In case of using the hand–held tester:
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON, and push the hand–held tester main switch ON.
(c)
Select the DATALIST mode on the hand–held tester.
CHECK:
Check the voltage condition output from the ECU displayed on the hand–held tester.
OK:
”Normal” is displayed.
In case of not using the hand–held tester:
PREPARATION:
Remove the skid contol ECU with connectors still connected.
CHECK:
Turn the ignition switch ON, measure voltage between termi-
nals IG1 and GND of skid control ECU connector.
OK:
Voltage: 10 – 14 V
OK
Check and replace skid control ECU.
NG
F02836
GND1
GND2
GND3
GND4
DI–266
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
4
Check continuity between terminal GND of skid control ECU connector and body
ground.
CHECK:
Measure resistance between terminals GND of skid control
ECU connector and body ground.
OK:
Resistance: 1 Ω or less
NG
Repair or replace harness or connector.
OK
Check for open circuit in harness and connector between skid control ECU and battery (See page
IN–32).
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–267
LEXUS RX300 (RM785E)
DTC
C1243 / 43, C1245 / 45
Malfunction in Deceleration Sensor
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1243 / 43
While vehicle speed gets to 0 km/h (0 mph) from 30 km/h (18
mph), and the condition that GL1 and GL2 signals of ECU
terminals did not change 2 LSB or more continued in a
sequence 16 times.
Deceleration sensor
C1245 / 45
At the vehicle speed of 30 km/h (18 mph) or more, and the
condition that the difference between acceleration and decel-
eration values of computation from deceleration sensor and
vehicle speed becomes more than 0.35 G continues for 60
sec. or more.
S Deceleration sensor
S Wire harness for deceleration sensor system
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand–held tester and start from step 2 in case of not
using the hand–held tester.
1
Check output value of the deceleration sensor.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON, and push the hand–held tester main switch ON.
(c)
Select the DATALIST mode on the hand–held tester.
CHECK:
Check that the deceleration value of the deceleration sensor displayed by the hand–held tester is changing
when tilting the vehicle.
OK:
Deceleration value must be changing.
OK
Check and replace skid control ECU.
NG
2
Check deceleration sensor (See page DI–205).
NG
Replace deceleration sensor.
OK
DI1GL–05
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