Misfire Detection Monitor Specifications

Misfire detection monitor operation: DTCs P0300 to P0310 (random and specific cylinder misfire), P1336 (noisy crank sensor, no crankshaft and camshaft sensor synchronization), P0315 (crankshaft position system variation not learned), P0316 (misfire detected on startup [first 1000 revolutions]), P0313 (misfire detect with low fuel level). 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: Minimum to maximum time since engine startup 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 if the profile correction factors are not learned. On selected vehicles, DTC P0315 is set immediately after a new PCM is installed until the scan tool procedure for neutral profile correction is completed. On all other vehicles, DTC P0315 is set if profile learning does not complete during the customer drive cycle for profile correction. The monitoring duration for the customer drive cycle is 10 cumulative seconds in conditions (a maximum of three, 97 to 64 km/h (60 to 40 MPH) defueled decelerations). The 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 operating correctly; and the CKP and CMP signals must be synchronized.

Assembly plant or repair facility typical profile learning entry conditions from minimum to maximum: The engine in deceleration fuel shut off (DFSO) mode for 4 engine cycles with the vehicle in PARK or NEUTRAL gear. The engine RPM is 2, 000 to 3, 000 RPM. The learning tolerance is 1%.

Customer drive cycle typical profile learning entry conditions from minimum to maximum: The 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 and the change is less than 600 RPM. The vehicle speed is 48 to 121 km/h (30 to 75 MPH). The learning tolerance is 1%.