For 1990-2009 cars only
Check Coolant Temp -- Range: ON/OFF: This output
refers to the commanded state of the Check Coolant Temp message located in
the message center. The message will be added to the message center display
based on the engine coolant temperature that is sent to the Instrument
Cluster as a class 2 message from the PCM. If the engine temperature is
greater than 121°C (250°F) the message will be added to the message
center, unless the Check Engine Temp message has been added to the message
center, and removed when the engine temperature is less than 118°C
(245°F).
Check Engine Temp -- Range: ON/OFF: This output refers to the commanded state of the Check Engine Temp message located in the message center. The message will be added to the message center display based on the engine coolant temperature that is sent to the Instrument Cluster as a class 2 message from the PCM. If the engine temperature is greater than 128°C (262°F) the message will be added to the message center and removed when the engine temperature is less than 125°C (257°F).
Coolant Level Switch -- Range: Low/OK: This parameter indicates when the engine coolant level is low. The scan tool displays Low when the PCM detects the engine coolant level switch is open.
ECT -- Range: -40°C to +150°C (-40°F to +302°F): The PCM applies 5.0 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as the engine temperature changes. When the sensor is cold (internal resistance high), the PCM senses a high signal voltage and interprets the voltage 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.
Displayed Coolant Temperature -- Range: 32-127°C (89-260°F): This data is the coolant temperature the Instrument Cluster is attempting to display on the coolant temperature gauge. This data may differ from the monitored coolant temperature for a period of time due to filtering. The data may also differ from the monitored coolant temperature when coolant temperature is not in the range of 71-127°C (160-260°F) since the display is limited to these values. If a Class 2 communication failure occurs, this data will be at the minimum value of 32°C (89°F).
Low Coolant -- Range: ON/OFF: This output refers to the command state of the Low Coolant message located in the message center. ON is displayed when the Instrument Cluster is commanding the Low Coolant message ON. OFF is displayed when the Instrument Cluster is not commanding the Low Coolant message ON. The Instrument Cluster will display the Low Coolant message when the Instrument Cluster receives a class 2 serial data message from the PCM.
Monitored Coolant Temperature -- Range: 40-215°C (40-419°F): This data is the clusters measurement of the engine coolant temperature as provided by the PCM on the Class 2 serial data line.
Reduced Engine Power -- Range: ON/OFF: This output refers to the commanded state of the Reduced Engine Power message located in the message center. On is displayed when the Instrument Cluster is commanding the Reduced Engine Power message ON. OFF is displayed when the Instrument Cluster is not commanding the Reduced Engine Power message ON. The Instrument Cluster will display the Reduced Engine Power message when the Instrument Cluster receives a class 2 serial data message from the PCM when the engine temperature reaches 132°C (270°F).
Check Engine Temp -- Range: ON/OFF: This output refers to the commanded state of the Check Engine Temp message located in the message center. The message will be added to the message center display based on the engine coolant temperature that is sent to the Instrument Cluster as a class 2 message from the PCM. If the engine temperature is greater than 128°C (262°F) the message will be added to the message center and removed when the engine temperature is less than 125°C (257°F).
Coolant Level Switch -- Range: Low/OK: This parameter indicates when the engine coolant level is low. The scan tool displays Low when the PCM detects the engine coolant level switch is open.
ECT -- Range: -40°C to +150°C (-40°F to +302°F): The PCM applies 5.0 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as the engine temperature changes. When the sensor is cold (internal resistance high), the PCM senses a high signal voltage and interprets the voltage 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.
Displayed Coolant Temperature -- Range: 32-127°C (89-260°F): This data is the coolant temperature the Instrument Cluster is attempting to display on the coolant temperature gauge. This data may differ from the monitored coolant temperature for a period of time due to filtering. The data may also differ from the monitored coolant temperature when coolant temperature is not in the range of 71-127°C (160-260°F) since the display is limited to these values. If a Class 2 communication failure occurs, this data will be at the minimum value of 32°C (89°F).
Low Coolant -- Range: ON/OFF: This output refers to the command state of the Low Coolant message located in the message center. ON is displayed when the Instrument Cluster is commanding the Low Coolant message ON. OFF is displayed when the Instrument Cluster is not commanding the Low Coolant message ON. The Instrument Cluster will display the Low Coolant message when the Instrument Cluster receives a class 2 serial data message from the PCM.
Monitored Coolant Temperature -- Range: 40-215°C (40-419°F): This data is the clusters measurement of the engine coolant temperature as provided by the PCM on the Class 2 serial data line.
Reduced Engine Power -- Range: ON/OFF: This output refers to the commanded state of the Reduced Engine Power message located in the message center. On is displayed when the Instrument Cluster is commanding the Reduced Engine Power message ON. OFF is displayed when the Instrument Cluster is not commanding the Reduced Engine Power message ON. The Instrument Cluster will display the Reduced Engine Power message when the Instrument Cluster receives a class 2 serial data message from the PCM when the engine temperature reaches 132°C (270°F).
