Vacuum Control Valve (VCV)
- Remove valve from engine. Connect a hand vacuum pump to pipe "S". Plug pipe "T" on Starlet valve and pipes "R" and "Y" on Tercel valve. With specified vacuum applied, blow into middle pipe on Corolla valve, pipe "Y" on Land Cruiser valve, pipe "X" on Starlet valve, and pipe "T" on Tercel valve.
- Air should come out specified pipes. See Vacuum Control Valve Testing table. Stop vacuum application and blow into respective pipes described in step 1). Valve should now be closed and no air should come out. Replace valve if necessary.
Vacuum Control Valve Testing
| Application | Vacuum (In. Hg) | Open Pipes |
|---|---|---|
| Corolla | 2.95 | Bottom |
| Land Cruiser | 2.75 | Z |
| Starlet | 5.30 | Bottom |
| Tercel | 3.55 | U, V, Z, W |