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 CMP11 sensors must operate correctly to run the monitor. The monitoring duration is the entire driving cycle (see disablement conditions below).

Typical misfire monitor entry conditions include entry condition minimum or 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 2 revolutions delay) 2 revolutions after exceeding 150 RPM below drive idle RPM to redline 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).