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Home >> Mazda >> 2021 >> CX-30 Turbo Premium >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Mechanical System (VIN M)) >> OCV For Hydraulic Variable Valve Timing System Inspection >> 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 simulation function [VLV_TIMING_DSD_EX], verify that the engine speed fluctuates when the OCV for hydraulic variable valve timing system duty value is 100%. (See 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 for hydraulic variable valve timing system 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 for hydraulic variable valve timing system and PCM for an open and short circuit.
    • Between OCV for hydraulic variable valve timing system terminal A and PCM terminal 1CO
    • Between OCV for hydraulic variable valve timing system terminal B and F12 15A fuse, and F12 15A fuse and main relay terminal C
  3. Inspect the oil passage for clogging and leakage.

    Oil passage

    • Between engine oil solenoid valve and OCV for hydraulic variable valve timing system
    • Between OCV for hydraulic variable valve timing system 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 .)

Without Using the M-MDS

  1. Disconnect the OCV for hydraulic variable valve timing system connector.
  2. Start the engine and idle it.
    NOTE:
    • When applying battery voltage between the OCV for hydraulic variable valve timing system terminals, the positive and negative cables can be connected to either terminal A or B.
  3. Verify that the engine idles roughly or stalls when battery voltage is applied between OCV for hydraulic variable valve timing system terminals A and B.
G13174639Courtesy of MAZDA MOTORS CORP.

If the engine idles roughly or stalls, verify the condition of the timing chain assembly (valve timing). engine does not idle roughly or stall, perform the following inspections.

  1. OCV for hydraulic variable valve timing system coil resistance inspection and spool valve op inspection (See COIL RESISTANCE INSPECTION .) (See Spool valve operation inspection .)
  2. Inspect the following wiring harnesses and connectors between the OCV for hydraulic variab valve timing system and PCM for an open and short circuit.
    • Between OCV for hydraulic variable valve timing system terminal A and PCM terminal 1CO
    • Between OCV for hydraulic variable valve timing system terminal B and F12 15A fuse, and F1 fuse and main relay terminal C
  3. Inspect the oil passage for clogging and leakage.

    Oil passage

    • Between engine oil solenoid valve and OCV for hydraulic variable valve timing system
    • Between OCV for hydraulic variable valve timing system 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 .)
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