Carrier VECTOR 6500 Operation & Service Manual page 160

Alarm
Steps
NO.
36 CHECK COOLANT TEMPERATURE
•
TRIGGER–ON: Coolant temperature is below 32°F (0°C) after the engine has been running for 5
minutes.
•
UNIT CONTROL:
•
RESET CONDITION: Auto reset when coolant temperature is higher than 36°F (2.2°C) 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, clear the
alarm(s). (See Note 1 page 7−2.) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
1 Check Coolant Temperature
Check temperature of coolant or
upper radiator hose
2 Check Engine Coolant Sensor
a. Check
coolant sensor (See Note 3 page
7−2.)
b. Check harness and control box
connector pins and terminals. (See
wiring schematic Section 10.)
c. Check
connection to ENCT.
Alarm/Cause
Engine Operation: alarm only.
Standby Operation: this alarm will not activate in standby Operation.
resistance of engine
voltage at harness
7−27
Corrective Action
Must be above 32°F (0°C)
Refer to Section 8.9.10
No physical damage to harness
No damage, moisture, or corrosion in connectors.
Must be 2.5 $ 0.5 VDC. This verifies microprocessor
output and wiring to sensor.
62-11389