Lexus ES300 (2002 year). Manual — part 302
F12723
3
BS
AST
S7
AST
Skid
Control ECU
ABS SOL
Relay
ABS-3 Fuse
Brake Actuator
Engine Room R/B
F41243
ABS No. 4
ABS R/B
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-329
482
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
CHECK CONTINUITY(ABS & TRACTION ACTUATOR - SKID CONTROL ECU
ASSY)
(a)
Disconnect the connector from the skid control ECU.
(b)
Check continuity between terminal 3 of engine room R/B
(for ABS solenoid relay) and terminal AST of skid control
ECU
OK: Continuity
OK
REPLACE ABS & TRACTION ACTUATOR ASSY
NG
5
CHECK HARNESS AND CONNECTOR(ABS SOLENOID RELAY - SKID CONTROL
ECU ASSY)(See page
OK
IF THE SAME CODE IS STILL OUTPUT AFTER
THE DTC IS DELETED, CHECK THE CONTACT
THE CONDITION OF EACH CONNECTION
NG
6
INSPECT FUSE(ABS NO.4 OF ABS R/B)
(a)
Remove ABS No. 4 fuse from the ABS R/B.
(b)
Check continuity of fuse.
OK: Continuity
NG
REPLACE FUSE
OK
CHECK AND REPAIR HARNESS AND CONNECTOR
F41242
ABS No. 3
05-330
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
483
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
7
INSPECT FUSE(ABS NO.3 OF ENGINE ROOM J/B)
(a)
Remove ABS No. 3 fuse from the engine room J/B.
(b)
Check continuity of fuse.
OK: Continuity
NG
REPLACE FUSE
OK
CHECK AND REPAIR HARNESS AND CONNECTOR
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-331
484
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1201/51 ENGINE CONTROL SYSTEM MALFUNCTION
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1201/51
Conditions 1. and 2. continue for 5 sec.:
1. Engine speed: 500 rpm or more.
2. A trouble signal in the engine control system is input.
Engine control system
HINT:
If trouble occurs in the engine control system, the ECU prohibits TRAC and VSC control.
INSPECTION PROCEDURE
1
CHECK DTC FOR ENGINE(See page
A
Normal Code
B
Malfunction Code
B
REPAIR ENGINE CONTROL SYSTEM
ACCORDING TO CODE OUTPUT
A
CHECK AND REPLACE ECM
0529K-03
F41981
FL MAIN
S8
R-W
Battery
W
1
Combination Meter
Skid Control ECU
Driver Side J/B
Brake Fluid Level
Warning SW
2
25
1
C7
C8
ALT
LBL-
LBLO
Brake
B-Y
Passenger Side J/B
3
I14
Ignition SW
S7
8
S7
21
PKB
17
2R
5
2P
7
2M
8
2G
11
B-G
2A
1
87
2
2E
2
3A
4
IG1 Relay
8
IA
IG1 AM1
W-B
ED
1
Engine Room R/B
B-G
1
W-B
40
W
R-W
R-W
R-W
B1
P5
Parking
Brake SW
GAUGE1
AM1
2
1
2A
2
2
W
W
W
3A
57
1
05-332
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
485
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1202/52 BRAKE FLUID LEVEL LOW/OPEN CUIRCUIT
IN BRAKE FLUID LEVEL WARNING SWITCH
CIRCUIT
CIRCUIT DESCRIPTION
The brake fluid level warning switch sends the appropriate signal to the ECU when the brake fluid level drops.
HINT:
Depress the parking brake pedal and also turns on the brake warning light but does not diagnose DTC No.
C1202 / 52.
DTC No.
DTC Detecting Condition0
Trouble Area
C1202 / 52
ECU terminal IG1 voltage is 9.5 V to 17.2 V and open cir-
cuit for the brake fluid level warning switch circuit continues
for 2 sec. or more.
Brake fluid level
Brake fluid level warning switch
Brake fluid level warning switch circuit
WIRING DIAGRAM
056AM-01
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