Lexus ES300 (2002 year). Manual — part 304
F13720
ON
6
1
5
F40456
GND2
YD
GND1
GND3
GND4
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-337
490
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR
(See page
2
RECONFIRM DTC(See page
)
A
Malfunction Code
B
Normal Code
B
END
A
3
INSPECT YAWRATE SENSOR
(a)
Remove the console box then remove the yaw rate sen-
sor with the connector still connected to it.
(b)
Turn the ignition switch ON.
(c)
Measure voltage between terminals YAW2 (1) - GYAW
(5), and terminals YD (6) - GYAW (5) of the yaw rate sen-
sor.
OK:
Terminals 1 and 5
(YAW2 - GYAW)
About 2.42 - 2.58 V
terminals 6 and 5
(YD - GYAW)
About 4.5 - 5.3 V
NG
REPLACE YAWRATE SENSOR
OK
4
INSPECT SKID CONTROL ECU TERMINAL VOLTAGE(YD TERMINAL)
(a)
Remove the skid control ECU with the connector still con-
nected to it.
(b)
Turn the ignition switch ON.
(c)
Measure voltage between terminals YD and GND of skid
control ECU.
OK: 4.5 - 5.3 V
OK
CHECK AND REPLACE SKID CONTROL ECU
ASSY
NG
05-338
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
491
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
5
CHECK HARNESS AND CONNECTOR(YAW RATE SENSOR - SKID CONTROL
ECU)
(a)
Check for open and short circuit in harness and connector between terminal YD of yaw rate sensor
and skid control ECU (See page
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE SKID CONTROL ECU ASSY
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-339
492
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1223/43 ABS CONTROL SYSTEM MALFUNCTION
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1223/43
ABS control system is abnormal.
ABS control system
INSPECTION PROCEDURE
1
CHECK DTC(See page
)
A
Normal Code
B
Malfunction Code
B
REPAIR CIRCUIT INDICATED BY OUTPUT
CODE
A
CHECK ABS WARNING LIGHT CIRCUIT
052AZ-03
F41983
Skid Control ECU
NEO
S6
26
BR-W
ECM
E6
17
NEO
BR-W
IF4
22
05-340
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
493
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1224/44 NE SIGNAL CIRCUIT
CIRCUIT DESCRIPTION
The skid control ECU receives engine revolution speed signals (NE signals) from the ECM.
DTC No.
DTC Detecting Condition
Trouble Area
C1224/44
When any of the following 1. through 2. is detected:
1. At vehicle speed of 30 km/h (19 mph) or more, and
when data received from the ECM is in normal condition,
and open or short circuit for engine revolution signal
circuit continues for 10 sec. or more.
2. While TRAC is operating, the conditions that open or
short circuit in engine revolution signal circuit is de-
tected, main throttle opening degree is 0 and IDL switch
is OFF continue for 0.24 sec. or more.
NEO circuit
ECM
Skid control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1
CHECK HARNESS AND CONNECTOR(TERMINAL NEO OF SKID CONTROL ECU
ASSY - ECM)(See page
)
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
0529M-03
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