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DIAGNOSTICS - ANTI-LOCK BRAKE SYSTEM
DI6SS-02
DTC Always ON ABS ECU Malfunction
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
S Battery
Detection of any conditions in 1. and 2.: S Charging system
Always ON 1. ABS ECU internal malfunction is detected. S Power source circuit
2. There is a malfunction in the ECU internal circuit S ABS ECU
S ABS warning light circuit
INSPECTION PROCEDURE
1 Check that the ABS ECU connectors are securely connected to the ABS ECU.
NO Connect the connector to the ABS ECU.
YES
2 Is DTC output?
Check DTC on page DI-201 .
YES Repair circuit indicated by the code output.
NO
3 Check voltage between terminals IG1 (3) and GND (1, 23) of ABS ECU connector.
PREPARATION:
ON Disconnect ABS ECU connector.
3 CHECK:
1 (a) Turn the ignition switch ON.
(+) (b) Measure voltage between terminals 3 and 1, 23 of ABS
ECU harness side connector.
OK:
(-)
23 Voltage: 10 - 14 V
F08558
NG Check for open and short circuit in harness and
connector between ECU-IG fuse and ABS ECU
(See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 399
DI-230
DIAGNOSTICS - ANTI-LOCK BRAKE SYSTEM
OK
4 Check ABS warning light.
In case of using the TOYOTA hand-held tester:
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.
In case of not using the TOYOTA hand-held tester:
PREPARATION:
ON Disconnect ABS ECU connector.
CHECK:
(a) Using service wire, connect terminal WA (30) and GND (1,
1
(+) 23) of ABS ECU harness side connector.
(b) Turn the ignition switch ON.
(-) 23 OK:
ABS warning light go off
30
F10040
OK Check and replace ABS actuator assembly.
NG
Check for open or short circuit in harness and connector between ABS warning light, DLC3 and
ABS ECU (See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 400
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