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Home >> Mazda >> 2024 >> CX-90 Turbo Select >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Emission System (VIN A)) >> Purge Solenoid Valve Inspection [PYUL] >> Inspect Purge Solenoid Valve >> Purge control inspection (M-MDS used)

Purge control inspection (M-MDS used)

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • Perform the procedure with the M-MDS connected to the DLC-2.
  • Start the engine and perform the procedure while idling.
  1. Remove the plug hole plate.
  2. Disconnect the evaporative hose from the purge solenoid valve to the charcoal canister.
  3. 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.
    G16704098Courtesy 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.
      • PID: [PRG_DUTY]
    • Evaporative purge control signal (short to ground in wiring harness between purge solenoid valve terminal A and ECM terminal 1AW)
      • ECM output signal circuit (wiring harness, connector)
      • Purge solenoid valve (See AIRFLOW INSPECTION )
  4. Connect the evaporative hose.
  5. When the 0% duty value of the purge solenoid valve is operated at a 100% duty value using the simulation function [PRG_DUTY], verify that the PID [SHRT_FUEL_TRIM] value fluctuates. (Refer to [SIMULATION INSPECTION ] in the Troubleshooting Service Information)
    • If the PID [SHRT_FUEL_ TRIM] value does not change, inspect the following.
      1. Switch the main power OFF.
      2. Switch the main power ON (READY off).
      3. When the 0% duty value of the purge solenoid valve is operated at a 50% duty value using the simulation function [PRG_DUTY], verify the operation sound of the purge solenoid valve. (Refer to [SIMULATION INSPECTION ] in the Troubleshooting Service Information)
        • If the operation sound can be verified, inspect the following.
          • Evaporative hose disconnection or damage (between intake manifold and purge solenoid, and purge solenoid valve and charcoal canister)
        • If the operation sound cannot be verified, inspect the following.
          • Purge solenoid valve (See AIRFLOW INSPECTION )
          • Open circuit in wiring harnesses and connectors (between main relay terminal C and purge solenoid valve terminal B, purge solenoid valve terminal A and ECM terminal 1AW)
    WARNING:
    • Heed the following to ensure safety while driving the vehicle.
      • To prevent an accident, work with another person (one person drives vehicle, other person operates M-MDS).
      • Comply with the legal speed limits and perform the procedure in a safe place.
  6. Drive the vehicle at an engine speed of approx. 2, 000 rpm for 30 s or more.
  7. Verify that the PID [PRG_DUTY] fluctuates between 0% and 100%.
    • If the PID [PRG_DUTY] value fluctuation cannot be verified, inspect the following and repair or replace the malfunctioning location.
      • ECM input signal circuit (sensor, switch, wiring harness)
      • Intake air temperature No. 1 signal (IAT sensor No. 1)
      • Throttle opening angle signal (throttle position sensor)
      • Under load/under no-load determination signal
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