Pinpoint Test B : A Virtual Gauge (Speedometer, Tachometer Or Temperature) Is Inoperative: Notes

Normal Operation and Fault Conditions 

See Speedometer, Tachometer and Temperature Gauge. Refer to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

Speedometer 

• If the vehicle speed message is missing or invalid for less than 5 seconds, the IPC defaults the speedometer to the last indication state, based upon the last message received.
• If the vehicle speed message is missing or invalid for 5 seconds or longer, the IPC defaults the speedometer to 0 km/h (0 mph).

Tachometer 

• If the engine rpm data message is missing for less than 5 seconds, the IPC defaults the tachometer to the last indication state, based upon the last message received.
• If the engine rpm data message is missing for 5 seconds or longer, the IPC defaults the tachometer to 0 rpm.

Temperature Gauge 

• If the engine coolant temperature data, engine overheat indication request, heater core temperature or engine off temperature data messages are missing for less than 5 seconds, the IPC defaults the temperature gauge to the last indication state, based upon the last message received.
• If the engine coolant temperature data, engine overheat indication request, heater core temperature or engine off temperature data messages are missing for 5 seconds or longer, the IPC defaults the temperature gauge to the full hot position.

Possible Sources 

• Communication concern
• BCM input concern
• PCM input concern
• IPC