Mitsubishi Eclipse II technical information manual page 69

text version of content this owner's manual page from owners manual to the vehicle Mitsubishi Eclipse, year of production 1995 - 1999:

I-48 ENGINE - Control System 200 Rev Misfire The threshold for determining what amount of rpm change indicates misfire varies with engine speed and load. This is required because as engine speed If the monitor detects misfire in more than 15% of cylinder firing opportunities during any 200 revolu- increases or load decreases, the overall effect of tion monitored segment, the MIL immediately begins a single cylinder misfire diminishes due to the mo- mentum of the crankshaft. flashing, a DTC is started, and the freeze frame is stored with information regarding the conditions at which the misfire occurred. This indicates that The misfire monitor contains an adaptive feature engine misfire has reached the point where damage that can take into account component wear, sensor to the catalytic converter is likely to occur. The ve- fatigue, and machining tolerances. The PCM notes hicle defaults to open loop operation to prevent the rpm variance between cylinders during normal ve- adaptive fuel controls from dumping additional fuel hicle operation and then uses these figures as a into the cylinders and accelerating damage to the foundation for calculating the threshold at which catalyst. Driving the vehicle with the MIL flashing rpm variance is considered to indicate misfire. NOTE is not recommended. Once out of the operating condition where the 15% The PCM requires normal vehicle operation to up- misfire is occurring, the MIL will stop flashing but date its memory. Because the PCM has no reference remain illuminated. The vehicle may be driven, but for “normal operation”, the PCM considers a misfire condition to be normal if installed in a vehicle thatshould be serviced immediately. is misfiring. The same situation can occur anytime Because some misfire is a common occurrence battery power to a PCM is lost and a vehicle is in a number of driving conditions, MIL illumination misfiring when the controller is reconnected, due to misfire may occur when no component has failed. Try to identify conditions that could trigger The misfire monitor triggers operation of the MIL in two different operating situations: the misfire monitor that are not related to component failure. Example of these are included below: 1,000 Rev Misfire l Damp ignition system components Misfire is continuously monitored (in 200 revolution l Low fuel/running out of gas (monitor triggers segments) once the enabling conditions have been met. If the monitor detects misfire in more than as engine sputters) 1.6% of the engine cycles in a 1,000 revolutionl “Lugging” the engine l Pulling heavy loads period, a temporary fault is set. Freeze frame data l Low quality gasoline of the operating conditions during the last 200 rpm of that 1,000 revolution period are stored. As with In addition, the following situations could mistakenly trigger the MIL: other monitors, failure of the misfire monitor on the l Large potholes next trip matures the code, the MIL illuminates, and l Extended rough road operation a DTC is stored. It is important to note that two trips are required for the code to mature. Continued misfiring during the initial trip does not illuminate the MIL.

owners manual Mitsubishi Eclipse

owners manual Mitsubishi Eclipse - year of production: 1995, 1996, 1997, 1998, 1999 - Mitsubishi Eclipse II technical information manual EN