IPA Tools 9005A Super MUTT Head - Manual (Page 23)

23
ABS CODES
BLINK CODE DIAGNOSTICS
The Trailer ABS ECU detects any electrical 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 repair-
ing a fault. lf there are additional codes in the memory, they only blink after you have
repaired the first fault.
IGNITION SWITCH POWER ACTIVATION USING THE TRACTOR
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 indi-
cator lamp located on the side of the trailer.
To obtain blink codes using ignition power activation, perform the following
procedures:
1. Activate Auxilary Circuit for no longer than five 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.
TO ACCESS ABS CODES USING THE MUTT ® :
Select the AUX or Brake light circuit, then press the control knob to flash either the
Brake or AUX line to access the trailer blink codes. Other methods include applying
and removing power to the AUX or brake circuit in sequence with the ABS manufac-
turer’s specifications. Consult the ABS system of manufacturer’s manual for detailed
instructions.
The diagnostic chart (pg. 24-29) references some of the ABS codes and the method
for releasing them from the CPU utilizing the SUPER MUTT
® ’s auxiliary circuit.