Toyota Corolla 1988-1997 Repair Guide

Deceleration Fuel Cut System

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OPERATION



See Figure 1

This system only applies to the 4A-F engine.

This system cuts off part of the fuel in the slow circuit of the carburetor to prevent overheating and afterburning of the exhaust system.



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Fig. Fig. 1: Deceleration fuel cut system components

TESTING



See Figures 2 and 3

  1. Connect a tachometer to the engine.
  2.  
  3. Start the engine and check that it runs normally.
  4.  
  5. Disconnect the throttle position switch terminal.
  6.  



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Fig. Fig. 2: Disconnect the throttle position switch wire from the harness

  1. Gradually increase the engine speed to 2300 rpm. Check that the engine slightly fluctuates.
  2.  


WARNING
Perform this procedure quickly to avoid overheating the catalytic converter.

  1. Reconnect the throttle position switch terminal. Again gradually increase the engine speed to 2300 rpm. and check that the engine operation is normal.
  2.  
  3. With the engine at idle unplug the solenoid valve. Connect two terminals and the battery terminals as shown.
  4.  



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Fig. Fig. 3: Connect the two terminals of the solenoid to the battery

  1. Check for a click in the solenoid valve when the battery is connected and disconnected.
  2.  
  3. Check the O-ring for damages.
  4.  
  5. Reinstall the valves and reattach the wiring.
  6.  

REMOVAL & INSTALLATION



Fuel Cut Solenoid Valve

This solenoid valve is only applicable to the 4A-F carbureted engines.

  1. Disconnect the solenoid valve wiring.
  2.  
  3. Carefully unscrew the valve from the carburetor. Discard the old O-ring.
  4.  
  5. Place a new O-ring on the end of the valve and securely tighten the unit into the carburetor.
  6.  

 
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