PINPOINT TEST T : The MIL Is Never or Always On: Notes

Diagnostic Overview

Refer to Instrument Panel Cluster (IPC) , MIL.

NOTE: If DTC U0100:00 sets in the IPC, other observable symptoms can be an inoperative speedometer, tachometer or odometer.

Normal Operation and Fault Conditions

If the engine MIL request message is missing or invalid for less than 5 seconds, the IPC defaults the MIL to its last state (on or off) based upon the last known good message received.

If the engine MIL request message is missing for 5 seconds or longer, the IPC sets DTC U0100:00 in continuous memory and defaults the MIL on.