Deceleration Fuel Cut System
- Connect tachometer to engine. Start engine and check that engine idles properly. Pinch off hose to vacuum switch.
- Gradually increase engine speed to 2000 RPM (Land Cruiser) or 3000 RPM (Celica). Engine should misfire slightly between 1800-3000 RPM as speed is raised.NOTE: Perform this procedure quickly to avoid overheating and damage to converter.
- Release hose and raise engine speed, checking to see that engine runs smoothly.
- Unplug wiring connector to solenoid valve. Engine should now idle rough. If engine responds as indicated, system is operating normally.
- Stop engine, and reconnect wiring. Do not forget to reconnect tachometer.