Warm Up Cycles

Once the MIL has been extinguished by the Good Trip Counter, the PCM automatically switches to a Warm Up Cycle Counter that can be viewed on the DRB III®. Warm Up Cycles are used to erase DTCs and Freeze Frames. Forty Warm Up cycles must occur in order for the PCM to self-erase a DTC and Freeze Frame. A Warm Up Cycle is defined as follows:

• Engine coolant temperature must start below and rise above 71°C (160°F)
• Engine coolant temperature must rise by 4.4°C (40°F)
• No further faults occur