DI–192
DIAGNOSTICS
–
ANTI–LOCK BRAKE SYSTEM
DI7CY–01
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, the ABS warning light lights up while at the same time prohibiting ABS control.
At this time, the ECU records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the ABS warning light blink and output the DTC.
WIRING DIAGRAM
1
3A
B
3
W–L
3
R–B
10
C11
12
C11
1
1
AM1
R–G
11
A7
WA
ABS
GAUGE
2
ABS ECU
Combination Meter
R/B No. 3, J/B No.3
2
3
5
12 C10
IG1
Relay
IG Switch
1
1
2
AM1
2
3
3
IG1
B–Y
FL Block
W–B
ALT
1
2
1
FL Main
Battery
W–B
1
B–L
IE
IH
F11497
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
356
DI–193
DIAGNOSTICS
–
ANTI–LOCK BRAKE SYSTEM
INSPECTION PROCEDURE
HINT:
Troubleshoot in accordance with the chart below for each trouble symptom.
ABS warning light does not light up
*1
ABS warning light remains on
*2
*1: Start the inspection from step 1 in case of using the TOYOTA hand–held tester and start from step 2 in
case of not using TOYOTA hand–held tester.
*2: After inspection of step 3, start the inspection from step 4 in case of using the TOYOTA hand–held tester
and start from step 5 in case of not using TOYOTA hand–held tester.
1
Check operation of ABS warning light.
PREPARATION:
(a) Connect the TOYOTA hand–held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand–held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand–held tester.
CHECK:
Check that the ABS warning light lights up on the combination meter using the TOYOTA hand–held tester.
HINT:
ABS warning light turns ”OFF” automatically 2 seconds after it is turnd ”ON”.
OK
Check and replace ABS ECU.
NG
2
Check ABS warning light.
See combination meter troubleshooting on page BE–2.
NG
Repair bulb or combination meter assembly.
OK
3
Check that connectors are securely connected to ABS ECU.
NO
Connect connector to ABS ECU.
YES
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
357
DI–194
DIAGNOSTICS
–
ANTI–LOCK BRAKE SYSTEM
Check for open circuit in harness and connector between combination meter and ABS
ECU (See page IN–28).
4
Check operation of the ABS warning light (See step 1).
OK
Check and replace ABS ECU.
YES
Repair circuit indicated by output code.
NG
5
Is DTC output?
Check DTC on page DI–154.
NO
Check for short circuit in harness and connector between DLC3 and ABS ECU (See
page IN–28).
2000 MR2 (RM760U)
AuthorĂ:
DateĂ:
358