Failure Conditions

ECM will monitor for misfire under following conditions:

• At least 5 seconds have passed since engine started.
• Engine speed is 500-6000 RPM.
• Engine coolant temperature is more than 14°F (-10°C).
• Engine is running free from sudden accelerations or decelerations such as occurs when changing gears.

When catalytic converter temperature is more than 1742°F (950°C) and misfire (change in angular acceleration of crankshaft) has occurred more frequently than allowed during last 200 crankshaft revolutions, ECM determines danger exists to catalytic converter and will set DTC and flash MIL. When misfire has occurred more frequently than allowed number of times (2 percent) during 1000 crankshaft revolutions, ECM will set DTC and constantly illuminate MIL.