P1094moderate severityPowertrain
Tumble Generator Valve Circuit 1 Open
on 2002 Subaru Impreza 2.5L H4 · AWD
What this code means
The PCM has detected an open circuit in the Tumble Generator Valve 1 actuator circuit on the right-hand bank. The actuator motor cannot be driven due to the break in the electrical path.
Symptoms
- Check Engine Light
- TGV 1 RH does not operate
- Minor efficiency and emissions impact
Common causes
- Broken wire in TGV 1 actuator circuit
- Disconnected TGV actuator connector
- Corroded connector pins
- Faulty TGV actuator with open motor winding
- PCM driver circuit open
Diagnostic steps
- Test TGV 1 actuator motor resistance
- Inspect actuator connector for disconnection or corrosion
- Check wiring continuity from PCM to actuator
- Verify PCM output signal
- Swap actuators between banks to isolate fault
Repair notes
Repair the open circuit in the TGV actuator wiring or replace the actuator if the motor winding is open.
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