Lexus RX300 (MCU15). Manual — part 250
DI–232
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
3
Check voltage between terminal SR of skid control ECU and body ground.
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
Turn the ignition switch ON, measure between terminal SR and GND.
OK:
Voltage: 1V or less
NG
Check and repair harness or ABS solenoid
relay.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection. If the connections are normal, the ECU may be defective.
F05279
Battery
Fusible Link
Block
ABS
R/B No. 2
ABS
SOL Relay
ABS Motor Relay
Brake Actuator
2
3
W
B
2
2
2
2
2
1
5
3
2
3
W–L
W–B
A7
W–B
W–B
LG–B
B–W
GR
29
A21
MR
MT
Skid Control ECU
EA
ED
1
A21
R+
A21
28
A7
A7
1
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–233
LEXUS RX300 (RM785E)
DTC
C0273 / 13, C0274 / 14
ABS Motor Relay Circuit
CIRCUIT DESCRIPTION
The ABS motor relay supplies power to the ABS pump motor. While the ABS & BA & TRC & VSC are acti-
vated, the ECU switches the motor relay ON and operates the ABS pump motor.
DTC No.
DTC Detecting Condition
Trouble Area
C0273 / 13
Conditions 1. and 2. continued for 0.2 sec. or more:
1. ECU terminal IG1 voltage is 9.5 V to 17.2 V in the initial
check or ABS, TRC or VSC are in operation, and when
the motor relay is ON, however the contact point of the
motor relay is OFF.
2. ECU terminal IG1 is 9.5 V or less, and when the motor
relay is ON, but the contact point of the motor relay does
not become ON.
S ABS motor relay
S ABS motor relay circuit
C0274 / 14
When the motor relay is OFF, the condition that the contact
point of motor relay is ON continues for 4 sec. or more.
WIRING DIAGRAM
DI1GJ–08
F12363
(+)
(–)
R/B No. 2
1
DI–234
–
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 hand–held tester.
1
Check ABS motor relay operation.
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 ACTIVE TEST mode on the hand–held tester.
CHECK:
Check the operation sound of the ABS motor relay when operating it with the hand–held tester.
OK:
The operation sound of the ABS motor relay should be heard.
OK
Go to step 4.
NG
2
Check voltage between terminal 1 of R/B No. 2 (for ABS motor relay) and body
ground.
PREPARATION:
Remove the ABS motor relay from R/B No. 2.
CHECK:
Measure voltage between terminal 1 of R/B No. 2 (for ABS mo-
tor relay) and body ground.
OK:
Voltage: 10 – 14 V
NG
Check and repair harness or connector.
OK
F00044
1
2
3
4
(+)
(–)
Continuity
1
2
3
4
1
2
3
4
Open
Continuity
–
DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–235
LEXUS RX300 (RM785E)
3
Check ABS motor relay.
CHECK:
Check continuity between each pair of terminal of motor relay.
OK:
Terminals 3 and 4
Continuity
(Reference value 62 Ω)
Terminals 1 and 2
Open
CHECK:
(a)
Apply battery voltage between terminals 3 and 4.
(b)
Check continuity between terminals.
OK:
Terminals 1 and 2
Continuity
NG
Replace ABS motor relay.
OK
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