Using WDS or equivalent

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Warm up the engine and idle it.
Turn the ignition switch off.
Disconnect the quick release connector going to the charcoal canister from the engine room side. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION .)
Start the engine and idle it.
After warming up the engine, verify that the negative pressure is not operating by placing a finger on the quick release connector for approx. 30 s as shown in the figure.
- If the vacuum is not present, inspect the following:
  - PCM terminal voltage
- Evaporative purge control
  - Purge solenoid valve
Connect the quick release connector. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION .)

Fig 1: Placing A Finger On The Quick Release Connector
Courtesy of MAZDA MOTORS CORP.
Connect the WDS or equivalent to the DLC-2.
When operating the purge solenoid valve of DUTY 0 % at DUTY 100 % using simulation function EVAPCP, verify that the engine idles roughly or stops.
- If the idling condition does not change, inspect the following.

Turn the ignition switch to the ON position.
When operating the purge solenoid valve of DUTY 0 % at DUTY 50 % using simulation function EVAPCP, verify that purge solenoid valve can be heard operating.
- If there is no sound of operation, inspect the following.
  - Vacuum hose: disconnection, damage (extension manifold (upper)-purge solenoid valve-charcoal canister)
  - Wiring harnesses, connectors: open circuit (main relay D terminal-purge solenoid valve-PCM 2P terminal)
- If there is no sound of operation, inspect the following.
  - Purge solenoid valve
Fig 2: Identifying DLC
Courtesy of MAZDA MOTORS CORP.