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Problem Probable Causes Corrective Action
MIB board alternating
“E” and “vat number
and side”.
Network error on the CAN bus
communication.
A. Ensure the CAN bus system is terminated at
BOTH ENDS (on the M3000 connector J6
and on the ATO board connector J10) with a
resistor equipped 6-pin connector.
B. With the computer OFF, press TEMP button
and ensure the AIF version appears. If not,
the 24V to the AIF boards may be missing.
Ensure all 6-pin CAN connectors are tight
between the M3000 (J6 and J7), MIB (J1
and J2), AIF (J4 and J5) and ATO (J10)
boards.
C. With the computer OFF, press TEMP button
and ensure the ATO version appears. If not,
check the CAN wire harness between the
AIF board J4 or J5 and the ATO board J9 or
J10. The ATO fuse on the right side of the
ATO box may be loose or blown; the 110V
to the ATO transformer may be missing or
the transformer bad. The J4/J5 connector
may be loose. Is the right computer
functioning? If not the fuse below the
contactor box may be loose or blown.
D. Check to see if MIB has 24V on pins 5 and
6 of J2. Check to see if 24V is present on
pins 5 and 6 of wire harness plugging into J4
or J5 of the first AIF board. If 24V missing,
check the pins. Replace the harness if
necessary.
E. Check continuity between each color wire
on the CAN connectors into J7 on the far
right computer and J10 on back of the ATO
board (black to black, white to white, and
red to red), and ensure there is no continuity
between different color wires (black to red,
red to white, and white to black).
F. Ensure black computer locator wires are
connected from ground to correct pin
position (see drawing 8051734 page 1-55).
G. Ensure all boards have the corner ground
wire attached and tightened.
H. The locator pin in J2 of the AIF board is
either loose or in the incorrect position. See
the charts on page 1-55 of this manual for
proper pin position.
I. Bad MIB and/or AIF board.
J. Broken resistor lead. Unwrap the resistor
leads and check ends.