Engine Speed

Scan tool displays 0 to 9999 RPM. Engine speed is computed by the PCM from the 3X reference input. It should remain close to desired idle under various engine loads with engine idling EVAP Canister Purge: Scan tool displays 0 percent to 100 percent Represents the PCM commanded PWM duty cycle of the [1][2]EVAP Purge valve. 0 percent displayed indicates no purge; 100 percent displayed indicates full purge.