P1520 — Volkswagen — Intake Manifold Changeover Valve 2 Circuit Open

P1520 (Volkswagen): Intake Manifold Changeover Valve 2 Circuit Open — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Intake Manifold Changeover Valve 2 Circuit Open. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Check Engine light illumination
  • Noticeable loss of engine power at high RPM
  • Rough engine idle
  • Poor acceleration performance
  • Increased fuel consumption

Possible causes

  • Faulty intake manifold changeover valve solenoid
  • Damaged or frayed electrical wiring in the valve circuit
  • Corroded electrical connector at the valve
  • Open or short circuit in the wiring harness
  • Failed Engine Control Module (ECM)

What to check

  • Inspect the electrical connector at the intake manifold valve for corrosion or loose pins
  • Check the wiring harness for signs of breaks, shorts, or heat damage
  • Measure the resistance of the changeover valve solenoid using a multimeter
  • Verify the presence of voltage and ground signals at the valve connector with the ignition ON
  • Test the valve operation by applying direct power to confirm mechanical actuation