4-40
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TABLE 4-27B. LOW AC VOLTAGE SHUTDOWN (303)
WARNING
Many troubleshooting procedures present hazards that can result in severe personal inju-
ry or death. Only qualified service personnel with knowledge of fuels, electricity, and machinery haz-
ards should perform service procedures. Review Important Safety Instructions page.
Indicator(s) Possible Cause Corrective Action
“LOW AC
VOLTAGE ”
shutdown
(303)
message.
5c. The problem may be the PT/CT mod-
ule (A36), the analog board (A33), the
customer interface board (A34), or the
digital board (A32).
c. If the measured AC voltage is high, the control
must have lost AC sensing. Check PTs (primary
1K−2.5K ohms; secondary 140−225 ohms),
sensing harness wires, alternator output con-
nections, and the customer interface board for
continuity. If these are OK, then check the ana-
log and digital boards, using the analog input
troubleshooting procedure (Table 4-29a/b).
*CAUTION: Wearing a wrist strap, set S12 to Off and A32 S5 to Standby before connecting/disconnecting harness plugs.
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