Coolant Hot Lamp: The scan tool displays On/Off. This parameter indicates the state
of the engine coolant temperature indicator as commanded by the instrument
panel cluster (IPC).
ECT Sensor: The scan tool displays -40°C to +151°C (-40°F to +304°F).
The Engine Coolant Temperature (ECT) sensor is mounted in the coolant
stream. The PCM applies 5 volts to the ECT sensor circuit.
The sensor is a thermistor which changes internal resistance
as temperature changes. When the sensor is cold (internal
resistance high), the PCM monitors a high signal voltage
and interprets it as a cold engine. As the sensor warms (internal
resistance decreases), the voltage signal decreases and
the PCM interprets the lower voltage as a warm engine.
FC Relay 1 Circuit Status: The scan tool displays OK or Fault. This parameter indicates the
state of the driver circuit for this device.
FC Relay 1 Command: The scan tool displays On or Off. The PCM is commanding Fan Control
relay 1 On when the scan tool indicates On. When the PCM commands the Fan
Control relay 1 On, both fans are enabled on low
speed.
FC Relay 2 and 3 Circuit Status: The scan tool displays OK or Fault. This parameter indicates the
state of the driver circuit for this device.
FC Relay 2 and 3 Command: The scan tool displays On or Off. The PCM is commanding all three
fan control relays on when the scan tool indicates On. When all fan control
relays are activated, both cooling fans are enabled on
high speed.
Low Coolant Input: The scan tool displays Active/Inactive. This parameter indicates
the state of the low coolant level indicator control circuit.
Low Coolant Lamp: The scan tool displays On/Off. This parameter indicates the state
of the low engine coolant level indicator as commanded by the IPC.