Canister Purge Control Valve: Testing and Inspection

Inspection Using An Oscilloscope (Reference)

NOTE: The duty ratio for the wave pattern can vary with the control conditions. Therefore determine comprehensively where the malfunction occurs among the input systems, output systems, and the PCM,

Purge control




- Terminal connected: 2P (+) - Negative battery terminal
- Oscilloscope setting: 5 V/DIV (Y): 20 ms/DIV (X), DC range
- Measurement condition: Idling after warm-up (no load)

NOTE: Purge control might not be activated depending on the engine conditions.