Mazda CX-5 Service & Repair Manual: Purge Control

Outline

• An appropriate amount of evaporative gas is fed into the intake manifold by the purge solenoid valve operation according to the engine operation conditions. This ensures driveability and prevents release of evaporative gas into the atmosphere.

• The PCM drives the purge solenoid valve based on the signal from each control part.

Block Diagram

Operation

Determination of purge solenoid valve energization time

• The PCM determines energization time based on purge flow amount. In addition, it corrects the energization time according to fluctuations in battery positive voltage (the lower the rate of battery positive voltage, the longer the energization time).

Calculation method for purge flow amount

• The PCM determines the purge flow amount through the addition of each correction to the target purge flow amount.

Purge control image

Operation condition

• In evaporative purge control during normal driving, the PCM sends a duty signal to the purge solenoid valve when all of the following conditions are met.

• Fuel injection control is in feedback zone (?=1)

• Engine coolant temperature 60 °C {140 °F} or more