4-27
Copyright 2017 Cummins Inc.
TABLE 4-17. LOW COOLANT WARNING OR SHUTDOWN (214 / 215)
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
COOLANT
LVL” warning
(214) or
shutdown
(215) message
Coolant level
is normal.
DS2 on the
engine
interface
board, A31,
is on.
DS2 on A31 is on, indicating that A31 is re-
ceiving a low coolant signal from the send-
er.
The sender, the harness or the A31 circuit
board could be bad.
If the coolant level is normal, isolate the source of the
low coolant signal. (This is a ground signal.)
Disconnect the signal lead at the sender and reset
the control.
1. If the 215 shutdown message drops out and
does not reappear, replace the sender.
*2. If the 215 shutdown message reappears and
remains after control reset, disconnect J4/A31
and check continuity from P4−7 to GND.
If there is continuity, replace the harness.
If there is no continuity, replace circuit
board A31.
“LOW
COOLANT
LVL” warning
(214) or
shutdown
(215) message
Coolant level
is normal.
DS2 on the
engine
interface
board, A31,
is off.
DS2 on A31 is off, indicating that A31 is not
receiving a low coolant signal from the
sender—but the 215 message indicates
that A32, the digital board, is responding to
a false low coolant signal.
A31, the engine interface board, or A32, the
digital board, could be bad.
If the coolant level is normal, isolate the source of the
low coolant signal.
Check J4−4/P4−4 on A32.
*1. Install harness tool between A32 J4/P4.
2. Open the J4-4 circuit and reset the control.
If the fault drops out and does not return,
replace A31.
If the fault returns after resetting the con-
trol, replace A32.
*CAUTION: Wearing a wrist strap, set S12 to Off and A32 S5 to Standby before connecting/disconnecting harness plugs.
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