Lexus ES300 (2002 year). Service manual — part 343
F41642
Driver Side J/B:
FAN RLY
Fuse
C91403
F41638
+B (+)
GND (-)
A22
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
05-215
368
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
INSPECT SOURCE VOLTAGE
(a)
Check the battery positive voltage.
OK:
Voltage: 10 - 14 V
NG
REPLACE BATTERY
OK
2
INSPECT FUSE(FAN RLY)
(a)
Remove the FAN RLY fuse from the driver side J/B.
(b)
Check continuity of FAN RLY fuse.
OK:
Continuity
NG
INSPECT FOR SHORT CIRCUIT IN ALL
HARNESSES AND COMPONENTS
CONNECTED TO FAN RLY FUSE
OK
3
INSPECT ABSORBER CONTROL ECU
(a)
Remove the absorber control ECU with connectors still
connected.
(b)
Turn the ignition switch to ON, measure voltage between
terminals A22 - 1 (+B) and A22 - 14 (GND) of the absorb-
er control ECU connector.
OK:
Voltage: 10 - 14 V
OK
CHECK AND REPLACE ABSORBER CONTROL
ECU(See page
NG
C91692
F41639
GND
A22
05-216
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
369
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
CHECK HARNESS OR CONNECTOR(ABSORBER CONTROL ECU - BODY
GROUND)
(a)
Disconnect the absorber control ECU connectors.
(b)
Turn the ignition switch to ON.
(c)
Measure resistance between terminal A22 - 14 (GND)
and body ground.
OK:
Continuity
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ABSORBER CONTROL ECU(See page
F41650
Absorber Control ECU
A22 FRO
17
25
GR-R
IF2
J5
J/C
B
(*1)
(*2)
IF8
3
S7
13
20
S1
Skid Control ECU Assy
Skid Control ECU Assy
*1: w/ VSC
*2: w/o VSC
GR-R
B
GR-R
GR-R
FRO
FRO
(*2)
GR-R
GR-R
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
05-217
370
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1776/76 RIGHT FRONT SPEED SENSOR CIRCUIT
DTC
C1794/94 RIGHT FRONT SPEED SENSOR CIRCUIT
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and transmits the appropriate vehicle speed signal to the absorb-
er ECU through the skid control ECU assy.
DTC No.
DTC Detecting Condition
Trouble Area
C1776/76
Right front speed sensor circuit malfunction
Right front speed sensor
Right front speed sensor circuit
C1794/94
Right front speed signal 20 km/h (12 mph) or more
Right front s eed sensor circuit
Skid control ECU assy
Absorber control ECU
WIRING DIAGRAM
056AD-01
05-218
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
371
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
HINT:
Start the inspection from the step 1 in case of using hand-held tester and start from step 2 in case of not
using hand-held tester.
1
READ VALUE OF HAND-HELD TESTER
(a)
Connect the hand-held tester to the DLC3.
(b)
Turn the ignition switch to ON and turn the hand-held tester main switch to ON.
(c)
Select the item ”WHEEL SPD FR” in the DATA LIST and read its value displayed on the hand-held
tester.
(d)
Check that there is no difference between the speed value output from the speed sensor displayed
by the hand-held tester and the speed value displayed by the speedometer when driving the vehicle.
OK:
There is almost no difference in the displayed speed value.
HINT:
There is tolerance of
10 % in the speedometer indication.
OK
CHECK AND REPLACE ABSORBER CONTROL
ECU(See page
NG
2
CHECK DIAGNOSTIC CODE OUTPUT
(a)
Check that DTC for ABS output the normal code.
NG
REPAIR CIRCUIT INDICATED BY OUTPUT
CODE
OK
3
CHECK HARNESS OR CONNECTOR(ABSORBER CONTROL ECU - SKID
CONTROL ECU ASSY)
(a)
Check for open and short circuit in harness and connector between absorber control ECU and skid
control ECU assy (See page
).
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ABSORBER CONTROL ECU(See page
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