For 1990-2009 cars only
Commanded Fan 1/Commanded Fan 2: This represents the PCM commanded state of the fan 1, or low speed,
and fan 2, or high speed control circuits.
ECT: 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: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.
FC Relay 2 and 3: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.
Fans High Speed: 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.
Fans Low Speed: 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.
Hot Temp. Lamp: The instrument panel cluster (IPC) illuminates the temperature indicator whenever the PCM sends a class 2 message requesting illumination. The class 2 message for the indicator is the same as that for the temperature gauge. The IPC determines when illumination of the indicator occurs based on the temperature value the IPC receives. The IPC will turn on the indicator when the engine temperature reaches 124°C (255°F) and turn off at 119°C (246°F).
ECT: 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: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.
FC Relay 2 and 3: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.
Fans High Speed: 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.
Fans Low Speed: 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.
Hot Temp. Lamp: The instrument panel cluster (IPC) illuminates the temperature indicator whenever the PCM sends a class 2 message requesting illumination. The class 2 message for the indicator is the same as that for the temperature gauge. The IPC determines when illumination of the indicator occurs based on the temperature value the IPC receives. The IPC will turn on the indicator when the engine temperature reaches 124°C (255°F) and turn off at 119°C (246°F).
