Test U: The Failsafe Cooling Warning Indicator Is Never/Always On

PINPOINT TEST U: THE FAILSAFE COOLING WARNING INDICATOR IS NEVER/ALWAYS ON

U1:

U2-U4:

Normal Operation
The failsafe cooling warning indicator informs the driver the engine coolant is overheating due to loss of engine coolant fluid or other cause, and the powertrain control module (PCM) is taking on limp home strategy. The other purpose is to inform the driver the engine cannot be cooled enough with the limp home strategy and the engine is about to be shut down by the PCM. The failsafe cooling information is sent from the PCM to the instrument cluster to illuminate the failsafe cooling warning indicator.

Possible Causes
- PCM
- instrument cluster