Without Using the M-MDS
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
- Start the engine and idle it.
- Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION (US) .)
- Disconnect the evaporative hose between the purge solenoid valve and 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 illustration.
- If vacuum is applied, inspect the following and repair or replace the malfunctioning location.
- PCM output signal circuit (wiring harness, connector)
- Evaporative purge control signal (short to ground in wiring harness between purge solenoid valve terminal A and PCM terminal 1AW)
- Purge solenoid valve (See AIRFLOW INSPECTION .)
- If vacuum is applied, inspect the following and repair or replace the malfunctioning location.
- Load the vehicle on the chassis dynamometer and drive it while maintaining the engine speed at approx. 2, 000 RPM.WARNING:
- When using a chassis dynamometer, be careful not to get parts such as tires or rollers caught in the rotating parts.
- Verify that vacuum is applied after approx. 30 s.
- If vacuum cannot be verified, inspect the following.
- PCM 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 PCM terminal 1AW)
- Throttle opening angle signal (throttle position sensor)
- Under load/under no-load determination signal (transaxle range sensor)
- Purge solenoid valve
- Purge solenoid valve power supply circuit (open or short circuit in wiring harness between purge solenoid valve terminal B and main relay terminal)
- If vacuum cannot be verified, inspect the following.