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Home >> Mazda >> 2012 >> 2 Touring, 1.5L Eng VIN Y, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine Control System MZR 1.5] >> Engine Control System Operation Inspection >> Variable Valve Timing Control System Operation Inspection >> When idling can be continued
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When idling can be continued

  1. Warm-up the engine.
  2. Connect the M-MDS to the DLC-2.
  3. Idle the engine.
  4. Access the VT Duty1 wt PID. (See ON-BOARD DIAGNOSTIC TEST .)
  5. Set the OCV duty valve to 100%  and verify that the engine idles roughly or stalls.
    • If as specified, inspect the timing belt component (valve timing deviation).
    • If not as specified, go to the next step.
  6. Remove the OCV and connect the OCV connector to the OCV. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
  7. Switch the ignition to ON.
  8. Access the VT Duty1 wt PID. (See ON-BOARD DIAGNOSTIC TEST .)
  9. Set the OCV duty value to 100%  and verify that the spool valve operates in the advance direction.
  10. If not as specified, inspect the following:
    • OCV operation (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION .)
    • Wiring harness and connectors between OCV terminal A and PCM terminal 2I for open or short circuit
    • Wiring harness and connectors between OCV terminal B and PCM terminal 2W for open or short circuit
  11. Inspect the following hydraulic passages for restriction and/or leakage:
    • Oil pressure switch-OCV
    • OCV-camshaft
    • Camshaft internal passage
  12. If they are normal, replace the intake camshaft pulley (with a built-in variable valve timing actuator). (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
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