ABS Warning Light Circuit CIRCUIT DESCRIPTION If the ECU detects trouble, it lights the ABS warning light 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 make the ABS warning light blink and output the DTC.
WIRING DIAGRAM
ABS Actuator with ECU
Combination Meter 17 C13 ABS Warning Light
2 C14
R-B
5 ID3
P
14 C14
30 A4
P
WA
W-B
Instrument Panel J/B Ignition Switch 13 1G
GAUGE
1 1G
AM1 1
4 1O
B-Y 2 IG1 AM1 1
8 1O
2
W-L
Instrument Panel J/B B (*1) B-G (*2)
FL Block 4 ALT
W-B
2 1O
12 1F
Battery
ID *1: Puerto Pico *2: Except Puerto Pico F09222 F07
2002 ECHO (RM884U)
Author:
Date:
401
DI-232 DIAGNOSTICS
-
ANTI-LOCK BRAKE SYSTEM
INSPECTION PROCEDURE Troubleshoot in accordance with the table 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 with 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 the 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 ”ON” and ”OFF” of the ABS warning light can be shown on the combination meter by the TOYOTA hand-held tester. OK
Check and replace ABS actuator assembly.
NG
2
Check ABS warning light.
See combination meter troubleshooting on page BE-2 . NG
Replace bulb or combination meter assembly.
OK
Check for open circuit in harness and connector between GAUGE fuse and ABS warning light. (See page IN-29 ).
2002 ECHO (RM884U)
Author:
Date:
402
DI-233 DIAGNOSTICS
3
-
ANTI-LOCK BRAKE SYSTEM
Check that the ECU connectors are securely connected to the ECU.
NO
Connect the connector to the ECU.
YES
4
Check operation of the ABS warning light (See step 1).
OK
Check and replace ABS actuator assembly.
YES
Repair circuit indicated by the code output.
NG
5
Is DTC output?
Check DTC on page DI-201 .
NO
Check for short circuit in harness and connector between ABS warning light, DLC3 and ABS ECU (See page IN-29 ).
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