System Operation
WARNING: This page is about a different car, the 1993 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.
- Warm engine to normal operating temperature. Shut engine off. Using vacuum "T", install vacuum gauge in vacuum line between variable induction Vacuum Switching Valve (VSV) and variable induction vacuum actuator. Variable induction VSV is located below intake manifold, near cylinder block. See Fig 1.NOTE: Variable induction VSV may also be referred to as the T-VIS VSV.
- Start engine. Vacuum gauge should indicate high vacuum at idle. Note that variable induction vacuum actuator rod moves inward so valves on variable induction system close.
- Increase engine speed to greater than 4200 RPM. No vacuum should be indicated on vacuum gauge. Variable induction vacuum actuator rod should move outward so valves are open. If system operates correctly, all components are okay. If vacuum reading was obtained at idle, but variable induction vacuum actuator does not operate, check variable induction vacuum actuator.
- If no vacuum reading was obtained at idle, check vacuum supply to vacuum tank. Vacuum tank is located below intake manifold. See Fig 1.
- If no vacuum supply exists, check vacuum hoses and circuit. If vacuum supply is okay, check vacuum tank, variable induction VSV and all hoses. If components are okay, check wiring circuit for variable induction VSV. See appropriate wiring diagram in WIRING DIAGRAMS article.
- On Celica Turbo, Engine Control Module (ECM) controls variable induction VSV ground circuit on Blue/Green wire. ECM is located at bottom center of dash, in front of console. Power is supplied to VSV through EFI main relay.
- If necessary to check EFI main relay, see EFI MAIN RELAY under RELAYS. Repair as necessary and recheck system operation.