Fail-Safe Cooling Warning Chime

The fail-safe cooling mode has two levels of operation, which are transmitted from the powertrain control module (PCM) over the standard corporate protocol (SCP) communication network to the instrument cluster. When the engine coolant temperature has reaches an over-temperature condition, the PCM provides a level one over-temperature signal to the instrument cluster. The instrument cluster positions the temperature gauge in the HOT range, illuminates the over-temperature warning indicator, oil pressure warning indicator, and malfunction indicator lamp (MIL). The instrument cluster also provides an intermittent chime, consisting of three tones within a two-second interval. If the over-temperature continues to increase, the PCM provides the instrument cluster with a level two over-temperature signal and the intermittent chime strategy will sound five tones within a two-second interval.