General Description

The coolant temperature sensor is located in the engine water jacket and is a resistive type sender. The sensor connected to the Powertrain Control Module (PCM) via discrete inputs. The filtered coolant temperature data is sent from the PCM to the IPC, via the class 2 serial data line. The IPC uses the temperature data received from the PCM and a software program to determine the proper coolant temperature gauge pointer position. When the IPC receives the coolant temperature via class 2, it compares the data to a calibrated look up table for the engine configuration. The coolant temperature is transmitted over the Class 2 serial data link on a change of 1.5 degrees Celsius or more. The instrument cluster uses a smoothing filter in order to secure a continuous response.