Misfire Detection Monitor Specifications

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Misfire detection monitor operation: DTCs P0300 to P0310 (random and specific cylinder misfire), P1336 (noisy crank sensor, no crankshaft/camshaft sensor synchronization), P0315 (crankshaft position system variation not learned), P0316 (misfire detected on startup [first 1000 revolutions]). The monitor execution is continuous, misfire rate calculated every 200 or 1,000 revolutions. The monitor does not have a specific sequence. The CKP, CMP, MAF, and ECT or CHT sensors have to be operating correctly to run the monitor. The monitoring duration is the entire driving cycle (see disablement conditions below).

Typical misfire detection monitor entry conditions: Entry condition minimum/maximum time since engine start-up is 0 seconds, engine coolant temperature is -7°C to 121°C (20°F to 250°F), RPM range is (full-range misfire certified, with 2 revolution delay) 2 revolutions after exceeding 150 RPM below drive idle RPM to red line on tach or fuel cutoff, profile correction factors are learned in KAM, and the fuel tank level is greater than 15%.

Typical misfire temporary disablement conditions: Closed throttle deceleration (negative torque, engine being driven), Fuel shut-off due to vehicle-speed limiting or engine-RPM limiting mode, a high rate of change of torque (heavy throttle tip-in or tip out) and rough road conditions.

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 profile learning sequence; The monitor sequence: profile must be learned before the misfire monitor is active; The CKP and CMP sensors are required to be OK; CKP/CMP signals must be synchronized. The monitoring duration is 10 cumulative seconds in conditions (a maximum of three, 97 to 64 km/h (60 to 40 mph) de-fueled decelerations).

Customer drive cycle typical profile learning entry conditions: Entry conditions from minimum to maximum: Engine in deceleration fuel shut-off mode for 4 engine cycles, the brakes are not applied, the engine RPM is 1,300 to 3,700 RPM, the change is less than 600 RPM, the vehicle speed is 48 to 121 km/h (30 to 75 mph), and the learning tolerance is 1%.

Assembly plant or repair facility typical profile learning entry conditions: Entry conditions from minimum to maximum: Engine in deceleration fuel shut-off mode for 4 engine cycles, the vehicle in park/neutral gear, the engine RPM is 2,000 to 3,000 RPM, the learning tolerance is 1%.