Misfire Monitor Specifications

Misfire monitor operation sets DTCs P0300 to P0304 (general and specific cylinder misfire), P0315 (unable to learn profile), P0316 (misfire during first 1,000 revolutions after start-up). The monitor execution is continuous. The misfire rate is calculated every 200 or 1,000 revolutions. The monitor does not have a specific sequence. The CKP and CMP sensors must operate correctly to run the monitor. The monitoring duration is the entire driving cycle (see disablement conditions information below).

Typical misfire monitor entry conditions include entry condition minimum/maximum time since engine start-up is 0 seconds, ECT is -7°C to 121°C (20°F to 250°F), RPM range is (full range misfire certified, with two revolutions delay) two revolutions after exceeding 150 RPM below drive idle RPM to red-line on tach or fuel cutoff. Profile correction factors learned in KAM are Yes, and the fuel tank level is greater than 15%.

Typical misfire temporary disablement conditions include closed throttle deceleration, fuel shut-off due to vehicle speed limiting or engine RPM limiting mode, and a high rate of change of torque (heavy throttle tip-in or tip-out).

The profile learning operation includes DTC P0315, unable to learn profile in three 97 to 64 km/h (60 to 40 mph) decelerations. Monitor execution is once per KAM reset, monitor sequence: profile must be learned before misfire monitor is active. Entry conditions include CKP, CMP, no AICE communication errors, CKP/CMP in synch. The monitoring duration; 10 cumulative seconds in conditions, a maximum of three 97 to 64 km/h (60 to 40 mph) defueled decelerations.

Typical profile learning entry conditions are engine in deceleration fuel cutout mode for four engine cycles, the brakes are not applied, the engine RPM is between 800 and 1,750 RPM, the change is less than 600 RPM, the vehicle speed is between 0 and 48 km/h (0 and 30 mph), and the learning tolerance is 1%.