Lexus RX300 (MCU15). Manual — part 260
F06926
E2
PMC
VCM
DI–272
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
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 master cylinder pressure 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 brake fluid pressure value of the master cylinder pressure sensor displayed on the hand–held
tester is changing when depressing the brake pedal.
OK:
Brake fluid pressure value must be changing.
OK
Go to step 4.
NG
2
Check master cylinder pressure sensor.
PREPARATION:
Install LSPV gauge to the front brake caliper bleeder plug por-
tion, and bleed air from LSPV gauge.
SST
09709–29018
CHECK:
Start the engine and depress the brake pedal, then check the
relation between the fluid pressure and voltage of PMC and E2
terminals of the master cylinder pressure sensor with connector
still connected.
OK:
Front brake caliper fluid pressure
Voltage
0 kPa (0 Kgf/cm
2
, 0 psi)
0.37 – 0.63 V
5,883 kPa (60 kgf/cm
2
, 853 psi)
1.57 – 1.83 V
11,768 kPa (120 kgf/cm
2
, 1,706 psi)
2.77 – 3.03 V
HINT:
Voltage between terminals VCM and E2: 4.7 – 5.3 V
NG
Replace brake actuator.
OK
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–273
LEXUS RX300 (RM785E)
3
Check for open and short circuit in harness and connector between master cyl-
inder pressure sensor and skid control ECU (See page IN–32).
NG
Repair or replace harness or connector.
OK
4
Check whether or not the ECU terminal STP input voltage is changed when the
stop light switch is turned on and off.
NO
Check stop light switch circuit (See page
BE–53).
YES
Check and replace skid control ECU.
F13430
Instrument Panel J/B
Stop Light
Switch
Skid Control ECU
Light Failure Sensor
Stop
Light RH
J11
Junction
Connector
Stop
Light LH
J15
Junction
Connector
J12
Junction
Connector
J14
Junction
Connector
High
Mounted
Stop Light
Fusible
Link Block
ALT
STOP
W
G–W
A
G–R
W–B
W
G–B
G–Y
G–W
G–Y
G–W
G–R
G–R
G–R
W–B
W–B
G–Y
A
A
A
1
7
STP
BN
A23
1A
1
1E
2
1
3
11
5E
5
5B
5C
9
IA1
1
2
7
3
BC2
3 BD1
3
4
3
4
1
2
BM
BI
5
3
J/B No.5
A
A
W–B
DI–274
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
DTC
C1249 / 49
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1249 / 49
ECU terminal IG1 voltage is 9.5 to 17.2 V and ABS is in
non–operation, the open circuit of stop light switch circuit
continues for 0.3 sec. or more.
Stop light switch circuit
WIRING DIAGRAM
DI1GO–10
F02806
F13605
LOCK
STP
(+)
(–)
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–275
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check operation of the stop light switch.
CHECK:
Check that the stop light lights up when brake pedal is depressed and turns off when the brake pedal is re-
leased.
OK
Go to step 3.
NG
2
Check stop light circuit (See page BE–53).
NG
Repair or replace stop light circuit.
OK
3
Check voltage between terminal STP of skid control ECU and body ground.
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
Measure voltage between terminal STP of skid control ECU
and body ground when brake pedal is depressed.
OK:
Voltage: 8 – 14 V
OK
Check and replace skid control ECU.
NG
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