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1997 SUBARU SVX
3.3L H6•AWD•AUTOMATIC•gas
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Repairs0Labor481Torque2473Fluid9DTC1598Battery1Maintenance0Recalls0
P1091moderate severityPowertrain

Tumble Generator Valve 1 RH Stuck Closed

on 1997 Subaru SVX 3.3L H6 · AWD

What this code means

The PCM has detected that the Tumble Generator Valve 1 on the right-hand bank is stuck in the closed position. The valve should open at higher loads to maximize airflow.

Symptoms

  • Check Engine Light
  • Reduced power at higher RPM
  • Restricted airflow sensation
  • Minor performance loss

Common causes

  • Carbon buildup preventing valve opening
  • Faulty TGV actuator motor
  • Broken or jammed TGV linkage
  • TGV shaft seized
  • Actuator circuit fault

Diagnostic steps

  1. Command TGV open with scan tool and verify position change
  2. Inspect TGV for carbon or debris obstruction
  3. Test TGV actuator motor
  4. Check linkage and shaft for binding
  5. Inspect actuator wiring

Repair notes

Clean the TGV valve and passage; replace the actuator assembly if mechanically seized.

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