Service manual

TC Series Hydraulic Brake ABS System
030.1-14
Blink Code Diagnostics
•
ABS Indicator Lamp
This lamp, located on the vehicle dash, serves two
purposes:
1. Alerts drivers or service personnel to a possible
fault in the hydraulic ABS, as follows:
•
If the ABS indicator lamp comes on briefly
then goes to off when the ignition is turned on,
there are no active or stored faults in the
hydraulic ABS.
•
If the ABS indicator lamp comes on and stays
on after the ignition is turned on and the
vehicle is driven in excess of 4 mph, there may
be an active fault in the hydraulic ABS.
•
If ABS indicator lamp comes on and stays on
and Goes off after the vehicle is driven more
than 4 mph there may be a stored fault in the
hydraulic ABS.
•
Displays diagnostic blink codes for servicing.
Definitions
•
Blink Code:
A series of blinks or flashes that describe a
particular ABS system condition.
•
Blink Code Diagnostics:
The ability of the Meritor WABCO ECU to
sense faults in the ABS system and to define
these faults using blink codes.
•
Blink Code Switch:
A momentary switch that activates blink code
diagnostic capabilities. Usually, it is mounted
under the dash or on the steering column.
•
Clearing Fault Codes:
The process of erasing faults from the ECU
memory bank.
•
Fault Code:
An ABS condition (fault) detected and stored in
memory by the Meritor WABCO ECU and
displayed by blink code. System faults may be
Active or Stored.
•
Active Fault:
A condition that currently exists in the ABS
system; for example, a sensor circuit
malfunction on the left front steering axle. An
active fault must be repaired before additional
faults can be displayed. When an active fault
has been repaired, it becomes a stored fault.
•
Stored Fault:
A condition that caused the system to register a
fault but is not currently active. For example, a
loose wire that corrected itself. A stored fault can
also be an active fault that has been corrected.
•
Table 2 describes the method of
distinguishing between active and stored faults
and explains how to clear them.
Using Blink Code Diagnostics
•
Observe the steps in Table 2—Identifying D
Version Hydraulic ABS Blink Codes.
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