IPA Tools 9007A Smart MUTT Head - Manual (Page 14)

14
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 indica-
tor lamp located on the side of the trailer. This method is for constant power vehicles
only.
To obtain blink codes using ignition power activation, perform the following prodce-
dure:
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.