Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Anti-Dieseling Solenoid

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OPERATION



See Figures 1 and 2



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Fig. Fig. 1: When the anti-dieseling solenoid is de-energized, the solenoid plunger blocks off the primary slow (low speed) system



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Fig. Fig. 2: The anti-dieseling solenoid threads into the side of the carburetor at the mounting location shown

The anti-diesel solenoid is used to prevent engine run-on after the ignition switch is turned OFF . The system uses a valve to shut off the supply of fuel to the primary low speed circuit, when the engine is turned off. The solenoid is normally closed and when energized, the needle assembly retracts, allowing fuel to flow through the primary low speed circuit.

TESTING



  1. Turn off ignition and disconnect air/fuel ratio solenoid harness connector.
  2.  
  3. Measure the resistance of the solenoid. The resistance should be 25-45 ohms.

    If the solenoid resistance is within specification, proceed to the next step.
     
    If the solenoid resistance is out of specification, replace solenoid assembly.
     

  4.  
  5. Reconnect solenoid harness connectors.
  6.  
  7. Disconnect ECM 10 pin connector from control unit and disconnect alternator L terminal.
  8.  
  9. Turn ignition switch ON and measure voltage between terminal G and ground.

    If battery voltage is not present, check and (if necessary) repair/replace harness.
     
    If voltage is within specification, check and (if necessary) replace control unit.
     

  10.  

REMOVAL & INSTALLATION




CAUTION
Observe all fuel system safety precautions when performing this procedure.

  1. Allow engine to complete cool.
  2.  
  3. Remove the air cleaner assembly.
  4.  
  5. Disconnect harness from harness connector and remove the solenoid wires from the connector.
  6.  
  7. Place a rag below the solenoid and unscrew the solenoid from the carburetor housing.
  8.  

To install:
  1. Install a new gasket to the solenoid.
  2.  
  3. Carefully screw the solenoid into the carburetor housing. Tighten the solenoid to 13 ft. lbs. (18 Nm)
  4.  
  5. Properly route the wires away from moving components and install the wiring into the connector.
  6.  
  7. Start the engine and verify no fuel leakage.
  8.  
  9. Install the air cleaner assembly.
  10.  

 
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