Circuit Description

PCM uses Crankshaft Position (CKP) sensor and Camshaft Position (CMP) sensor to monitor changes in crankshaft rotation for each cylinder to detect a misfire. If a difference in crankshaft rotation for a specific cylinder(s) is present, MIL will illuminate. If difference in crankshaft rotation is significant, MIL will flash, indicating a catalytic converter damaging condition. DTC P0300 will set when:

• Engine speed change less than 200 RPM in 50 mS for 5 seconds after engine start to one second from fuel shut-off.
• MAP sensor value change is less than.19 psi (1.3 kPa) in 16 firing events for 5 seconds after engine start to one second from fuel shut-off.