CUMMINS QST30 - High Engine Temperature Warning (211) or Shutdown

4-26
Copyright  2017 Cummins Inc.
TABLE 4-16. HIGH ENGINE TEMPERATURE WARNING (211) OR SHUTDOWN (212)
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
“HIGH
COOLANT
TEMP”
warning
(211) or
shutdown
(212)
message.
Coolant
mixture and
level is normal.
No airflow
obstructions.
Fan belt is OK.
1. Engine problem:
 Coolant pump could be faulty.
 Thermostat could be faulty.
 There could be an obstruction in
the coolant flow.
 External coolant pump (with re-
mote radiator) could be faulty.
 External radiator fan motor (with
remote radiator) could be faulty.
2. The generator set may have been
overloaded.
3. Sender, harness or PCC circuit board
could be bad.
1. Refer to the engine service manual if there are
any physical indications of overheating.
2. Correct any overload condition.
3. If there are no physical indications of overheat-
ing, check to see if the PCC accurately displays
ambient engine temperature.
 If the PCC ambient coolant temperature
reading is accurate, the engine may be
overheating. Refer to the engine service
manual.
 If the PCC ambient coolant temperature
reading is not accurate, isolate to the
sender, harness, engine interface board
(A31), analog board, or digital board.
Disconnect the coolant temperature sender
leads, and connect a coolant temperature
sender simulator to the harness.
a. If the control responds to the simulator, re-
place the sender.
*b. If the control does not respond to the simu-
lator, install harness tool between A31
J5/P5. Connect the coolant temperature
sender simulator (and B+) to A31 J5.
 If the control displays the correct simulated
temperature, replace the harness.
 If the control does not display the correct
simulated temperature, install harness
tool at A31 J2/P2, and open lines 18/19
(and 14/15, if applicable). Check for conti-
nuity between A31 J2-18 to 19 (for coolant
temp L), and A31 J2-14 to 15 (for coolant
temp R).
 If no continuity, then A31 is bad.
 If continuity is OK, then send a simu-
lated temperature signal and mea-
sure the voltage out of A31 (A31
J2-18 to 19, and A31 J2-14 to 15).
If voltage is not OK (refer to the ana-
log board inputs and outputs, Table
4-31), replace A33.
If voltage is OK, refer to the analog/
digital troubleshooting procedure
(Table 4-30a/b).
*CAUTION: Wearing a wrist strap, set S12 to Off and A32 S5 to Standby before connecting/disconnecting harness plugs.