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36 CHECK COOLANT TEMPERATURE
TRIGGER-ON:
"Check Engine Coolant Sensor" alarm not active (if so, refer to alarm 129 first) and
coolant temperature is below 0°C (32°F) after the engine has been running for 5 minutes.
UNIT CONTROL: Engine operation: alarm only.
Standby operation: this alarm will not activate in standby operation.
RESET CONDITION: Auto reset when coolant temperature is less than 2.2°C (36°F) or alarm may be
manually reset via keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
Check Coolant Temperature
a. Check temperature of coolant or
upper radiator hose
Check Engine Cooling System
a. Compare actual engine tempera-
ture to the microprocessor reading.
Temperature must be within ±11.1°C (±20°F).
b. Test operation of engine coolant
thermostat.
Must operate correctly. Refer to engine manual
c. Check water pump operation.
No seepage at weep hole. Bearings tight and quiet.
Impeller firmly attached to shaft.
d. Check water pump bypass hose to
thermostat housing for internal
blockage.
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