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Home >> Mazda >> 2024 >> CX-30 Preferred >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Mechanical System (VIN Y)) >> Oil Control Valve (OCV) Inspection (VIN Y) >> Hydraulic Variable Valve Timing Control System Operation Inspection >> When idling can be continued >> Using The M-MDS

Using The M-MDS

WARNING: This page is about a different variant/trim than selected.
  1. Connect the M-MDS to the DLC-2.
  2. Warm up the engine.
  3. Using the PCM simulation function [VLV_TIMING_DSD_EX], verify that the engine speed fluctuates when the OCV duty value is 100%. (Refer to SIMULATION INSPECTION . ) If the engine speed fluctuates, verify the condition of the timing chain assembly (valve timing). If the engine speed does not fluctuate, perform the following inspections.
    1. OCV coil resistance inspection and spool valve operation inspection. (See COIL RESISTANCE INSPECTION .) (See SPOOL VALVE OPERATION INSPECTION .)
    2. Inspect the following wiring harnesses and connectors between the OCV and PCM for an open and short circuit.
      • Between OCV terminal A and PCM terminal 1CO
      • Between OCV terminal B and F12 15A fuse, and F12 15 fuse and main relay terminal C
    3. Inspect the oil passage for clogging and leakage.

      Oil passage 

      • Between engine oil solenoid valve and OCV
      • Between OCV and camshaft
      • Oil passage inside camshaft
    4. If the inspection items are normal, replace the hydraulic variable valve timing actuator. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION (VIN Y) .)
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