Pinpoint Test AK : The Engine Over-Temperature RTT (RECONFIGURABLE Telltale) Is Never Or Always On: Notes

Normal Operation and Fault Conditions 

See Engine Over-Temperature RTT. REFER to: Message Center - System Operation and Component Description .

If the engine coolant temperature data or the engine overheat indication request messages are missing or invalid for less than 5 seconds, the IPC defaults the engine over-temperature RTT to the last indication state (on or off), based upon on the last message received.

If the engine coolant temperature data or the engine overheat indication request messages are missing or invalid for 5 seconds or longer, the IPC defaults the engine over-temperature RTT on.

Possible Sources 

• Communication concern
• GWM concern
• PCM input concern
• IPC