Product Manual

12
PART 5: PRETESTING CHECKLIST
The pretesting checklist should always be completed prior to using the MUTT
®
UNIT PLACEMENT
• Place the tester on a fl at, level surface.
• Chock trailer wheels to avoid rolling before testing brakes.
MAINTAIN CONNECTORS
Dielectric grease should be used on all connections to avoid corrosion. If a bad
connection exists at the terminal junction, you may get an erroneous reading and
the MUTT
®
will not work properly.
• Make sure you have a solid connection in the socket.
• Be certain the 7 pins in each plug are clean and spread to the proper size.
• Always check the MUTT
®
connector pins at the side of the MUTT
®
for proper
expansion. Over time, the pins may bend in slightly resulting in a poor connection
between the connector and the cable ends. A fl at head screwdriver can be used
to expand the pins until a tight connection is made.
CABLE TESTING PROCEDURE
The MUTT
®
has a special cable feature to test 7-way round pin cables for continuity.
The cable testing feature can be used to test a tractor’s cable, or the supplied MUTT
®
cable. All cables should be tested prior to MUTT
®
operation.
• Insert each end of the cable into both side connectors on the MUTT
®
. Be sure to
push the cable ends in fi rmly until they reach the bottom of the connector.
• Turn main power switch to a desired power supply.
• Once the power is selected, the green lights around the control knob will blink
and disappear one at a time until only the Ground Integrity Indicator remains solid
green. Once the initial check has been performed, poor cable conditions will be
shown by a blinking light for the problem circuit.
• If the cable has an open circuit or continuity problem, the corresponding circuit will
fl ash repeatedly.
• Further testing can be performed by selecting each circuit individually via the
control knob or remote. When an open circuit is detected, the LED for the circuit
will fl ash and an audible alert will be heard.
29
Fault
Code
Explanation Possible Causes
PLC
Select
1M
PLC
Select
2M
00
System OK (with vehicle traveling
> 6 mph)
ABS is operational Displays “00”
when traveling > 6 MPH
XX
01
Red channel wheel speed sensor
wiring S1A has an Open or Short
circuit.
Indicates a wheel speed sensor or its
wiring has short or open circuit. Discon-
nect the relevant sensor and measure
the resistance between the two pins in
the sensor connector housing.
If sensor extensions are used verify
extension continuity and connections.
Replace sensor and/or extension cable.
The Ohm meter reading for the sensor
or sensor and extension cable should be
between 980 and 2350 Ohm (.98K and
2.35K Ohm) If not, replace sensor and/
or extension cable.
X
02
Red channel wheel speed sensor
wiring S1B has an Open or Short
circuit.
X
03
Blue channel wheel speed sensor
wiring S2A has an Open or Short
circuit.
X
04
Yellow channel wheel speed sensor
wiring S2B has an Open or Short
circuit.
X
05
Blue channel wheel speed sensor
wiring S3A has an Open or Short
circuit.
X
06
Yellow channel wheel speed sensor
wiring S3B has an Open or Short
circuit.
X
07 System OK (No Active Fault)
ABS ECU is fully operational. Displays “07”
vehicle is stationary
XX
11
Red channel speed sensor S1A has
low sensor output
Sensor or spring clip is worn or not prop-
erly adjusted, wiring open or short circuit,
wheel bearing not properly adjusted (these
faults will only occur at speeds of greater
than 6 mph). Measure the AC voltage at
the sensor in question while rotating the
wheel at a rate of about one revolution
every two seconds. The output should be
at least 200 millivolts (0.2 VAC). If this is
not the case, push in the sensor until it
touches the exciter and rotate the wheel
again. If this doesn’t correct the problem,
then the sensor and the sensor block clip
should be replaced.
If sensor extensions are used verify exten-
sion continuity and connections. Replace
sensor and/or sensor cable.
Inspect exciter teeth for minor damage or
teeth fi lled with debris. Verify all exciters
have the same number of teeth.
Verify sensor and valve wiring/plumbing
is correct.
See side by side axle by axle confi gura-
tions.
X
12
Red channel speed sensor S1B has
low sensor output.
X
13
Blue channel speed sensor S2A has
low sensor output.
X
14
Yellow channel speed sensor S2B
has low sensor output.
X
15
Blue channel speed sensor S3A has
low sensor output.
X
16 Yellow channel speed sensor S3B
gap too large. Gap should be kept to
a minimum.
X