IPA Tools 9008-DL Super MUTT Deluxe Edition - Manual (Page 14)

14
BLINK CODE DIAGNOSTICS
The Meritor WABCO Enhanced Easy-Stop Trailer ABS ECU detects any electri-
cal fault in the trailer ABS. Each of the faults has a code. When a fault occurs, the
ECU stores the code for that fault in the memory.
There are two kinds of faults: active and stored. Active faults are those currently
existing in the system, such as a broken wire. Stored faults are faults that have
occurred but do not presently exist. Active faults can be cleared only after repairs
are completed.
The ECU signals a malfunction by lighting both the internal and external indicator
lamp when a fault exists. The external ABS indicator lamp is usually mounted on
the left rear of the trailer, near the rear wheels.
There are two ways to obtain blink codes:
» Ignition Power Activation (recommended method)
» Diagnostic Tool
Although the ECU can store multiple faults in its memory, it only displays one
blink code at a time. This is why it is important to re-check the blink codes after
repairing a fault. lf there are additional codes in the memory, they only blink after
you have repaired the first fault.
IGNITION POWER ACTIVATION
Ignition Power Activation is the process of interrupting the power on the blue wire
by some other means (Auxilary Circuit) to display blink codes on the trailer ABS
indicator lamp located on the side of the trailer. This method is for constanpower
vehicles only.
To obtain blink codes using ignition power activation, perform the following
procedure:
1. Activate Auxilary Circuit for no longer than 5 seconds. The ABS indicator
lamp will be on.
2. Turn the Auxilary Circuit off. The ABS indicator lamp will go out.
3. Turn the Auxilary Circuit on. The ABS indicator lamp will then come on,
then go out.
4. The blink code will be displayed three times by the ABS indicator lamp on
the trailer.