285
3 Abnormal ABS operation Likely Causes
[Description]
It is in close connection with the
driver status and the road conditions and is
difficult to diagnose. However, if there is no
DTC memory, the following inspections can be
performed.
Improperly installed sensor
Sensor wire harness faulty
Damaged sensor
Damaged ring gear
Foreign objects in the sensor
Damaged wheel bearing
Damaged ABS HCU
Damaged ABS ECU
Is the sensor installed correctly
Check the sensor output volt-
age
Check each sensor
Check each sensor ring gear
Check the wheel bearing clearance
Check the ABS ECU socket and
the middle connector
No
Installed it correctly
Abn.
Abn.
Abn.
Abn.
Ok
Yes
No
Ok
Ok
Replace
Replace
Repair
the connector
Use scan meter for HCU di-
agnosis
Yes
Does the fault reoccur?
Yes
No
Refer to
"Occasional
Problem
Service Key
Points"
Replace the ABS HCU
Remove the ABS ECU connector,
check whether the resistances
among the following terminals are
within specification?
Standard: 1.0~1.3K ¸
Shake the sensor wire harness and
connector while measuring them
LF: 1-2
RF: 19-20
LR: 5-6
RR: 22-23
Abn.
Replace
or Repair
Yes
Ok
Repair the
wire har-
ness or
connecto
Replace the ABS HCU
Abn.
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