Purge control inspection (M-MDS not used)

WARNING: This page is about a different variant/trim than selected.

NOTE:

Start the engine and perform the procedure while idling.

Remove the plug hole plate.
Disconnect the evaporative hose from the purge solenoid valve to the charcoal canister.

While idling the engine when cold, verify that vacuum is not applied by touching the purge solenoid valve with your finger as shown in the figure below.

Courtesy of MAZDA MOTORS CORP.

COMPONENT OPERATIONS

Component no	Refer to
1	Purge solenoid valve

If vacuum is applied, inspect the following and repair or replace the malfunctioning location.
- ECM output signal circuit (wiring harness, connector)
Evaporative purge control signal (short to ground in wiring harness between purge solenoid valve terminal A and ECM terminal 1AW)
- Purge solenoid valve (See AIRFLOW INSPECTION )

WARNING:

When using a chassis dynamometer, be careful not to get parts such as tires or rollers caught in the rotating parts.

Load the vehicle on the chassis dynamometer and drive it while maintaining the engine speed at approx. 2, 000 rpm.
Verify that vacuum is applied after approx. 30 s.
- If vacuum cannot be verified, inspect the following.
  - ECM input signal circuit (sensor, switch, wiring harness)
    - Intake air temperature No. 1 signal (IAT sensor No. 1)
    - Evaporative purge control signal (open circuit in wiring harness between purge solenoid valve terminal A and ECM terminal 1AW)
    - Throttle opening angle signal (throttle position sensor)
    - Under load/under no-load determination signal
  - Purge solenoid valve (See AIRFLOW INSPECTION )
  - Purge solenoid valve power supply circuit (open or short circuit in wiring harness between purge solenoid valve terminal B and main relay terminal C)