Nissan Stanza/200SX/240SX 1982-1992 Repair Guide

Fuel Shut-Off System

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See Figures 1, 2, 3, 4 and 5

This system is designed to reduce HC emissions and also to improve fuel economy during deceleration.

The fuel shut-off system is operated when the engine runs at higher than 2, 200 rpm and the throttle valve is closed. These conditions are detected by the engine revolution switch and the throttle valve switch. As the engine speed goes down to the recovery zone which is lower than 1,600 rpm, the fuel shut-off system does not operate even if the throttle valve is kept closed.

INSPECTION



Entire System
  1. Disconnect harness connector on carburetor. Then connect jumper wires between each connector as illustrated.
  2.  



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Fig. Fig. 1: Fuel shut-off system



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Fig. Fig. 2: Fuel shut-off system testing procedure

  1. Start the engine and make sure that the engine stops when engine speed increases to about 2,000- 2,500 rpm. If not, check the harness connections for engine revolution switch and repair them as necessary. If the harness connections are OK--replace the engine revolution switch.
  2.  

Throttle Valve Switch
  1. Disconnect harness connector on the carburetor.
  2.  
  3. Check the continuity between the terminal of the connector and carburetor body when accelerator pedal is depressed or released--refer to the necessary illustrations.
  4.  



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Fig. Fig. 3: Fuel shut-off system testing procedure



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Fig. Fig. 4: Fuel shut-off system testing chart



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Fig. Fig. 5: Fuel shut-off system testing chart

 
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