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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (ENGINE CONTROLS [SYSTEM & COMPONENT TESTING])AIR INDUCTION SYSTEMSVARIABLE TUMBLE CONTROL SYSTEM - MAZDA6 (2.3L)VARIABLE TUMBLE CONTROL SYSTEM (VTCS) SOLENOID VALVE INSPECTION
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Variable Tumble Control System (VTCS) Solenoid Valve Inspection

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Variable Tumble Control System (VTCS) Solenoid Valve Inspection
WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

  1. Airflow Inspection

    Disconnect negative battery cable. Remove VTCS solenoid valve. Apply air pressure to port "B". See Figure. Air should flow from port "C". Using fused jumper wires, apply battery voltage to VTCS solenoid valve terminals. Apply air pressure to port "B". Air should flow from port "A". If airflow is as specified, check for open or short circuit. Go to next step. If airflow is not as specified, replace VTCS solenoid valve.

  2. Open Circuit Inspection

    Disconnect PCM and VTCS solenoid valve harness connectors. Using DVOM, check continuity between following terminals:
    • VTCS solenoid valve harness connector terminal "B" and PCM 30-pin harness connector terminal No. 4T (Blue/Orange wire).
    • VTCS solenoid valve terminal "A" and main relay 4-pin harness connector terminal "C" (White wire).

    If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

  3. Short Circuit Inspection

    Check for continuity between following:
    • VTCS solenoid valve harness connector terminal "B" (Blue/Orange wire) and body GND.
    • VTCS solenoid valve harness connector terminal "A" (White wire) and power supply.

    If continuity is present, repair short circuit in suspect wire or replace wire harness.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.