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DI-218
DIAGNOSTICS - ANTI-LOCK BRAKE SYSTEM
DI6SN-04

DTC C0273 / 13, C0274 / 14 ABS Motor Relay Circuit

CIRCUIT DESCRIPTION
The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switches
the ABS motor relay ON and operates the ABS pump motor.
DTC No. DTC Detecting Condition Trouble Area
Detection of any conditions in 1. and 2.:
1. When ABS motor relay is ON, relay contact is OFF for
C0273 / 13 0.2 sec. or longer.
2. When ABS motor relay is turned ON, relay contact is
OFF for 0.5 sec. or longer. S ABS motor relay
S ABS motor relay circuit
t l i it
Detection of any conditions in 1. and 2.:
S ABS motor voltage
1. When ABS motor relay is OFF, relay contact is ON for
C0274 / 14 0.2 sec. or longer.
2. When ABS motor relay is turned OFF, relay contact is
ON for 2 sec. or longer.

WIRING DIAGRAM

ABS Actuator with ECU

Fusible Link Block
ALT ABS 24
5 B
A4 +BM

2
B
A4 +BS

1
BR
A4 GND1

23
W-B
A4 GND2

Battery
EC

F09225

2002 ECHO (RM884U)

Author : Date : 388
DI-219
DIAGNOSTICS - ANTI-LOCK BRAKE SYSTEM

INSPECTION PROCEDURE
HINT:
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.

1 Check ABS motor relay operation.

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 the operation sound of the ABS motor individually when operating it with the TOYOTA hand-held
tester.
OK:
The operation sound of the ABS motor should be heard.

NG Check and replace ABS actuator assembly.

2 Check voltage between terminals +BM (24) and GND (1, 23) of ABS ECU connec-
tor.

PREPARATION:
LOCK Disconnect the ABS ECU connector.
CHECK:
1 Measure the voltage between terminals 24 and 1, 23 of ABS
(+) ECU harness side connector.
OK:
Voltage: 10 - 14 V
(-)
23 24
F08557

NG Check and replace ABS fuse.
Check and repair harness or connector.

If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection. If the connection is normal, the ECU may be defective.

2002 ECHO (RM884U)

Author : Date : 389

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