Toyota Cressida and Van 1983-1990

Idle Speed Control Valve

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REMOVAL & INSTALLATION



This procedure applies to Cressida models only.

  1. Drain the engine coolant into a suitable container. Separate the two idle speed valve connectors.
  2.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Disconnect the two water by pass hoses and the vacuum hoses from the idle speed control valve body.
  2.  
  3. Remove the two idle speed control valve retaining bolts and remove the valve from the vehicle.
  4.  

To install:

  1. Install the valve onto the vehicle and install two idle speed control valve retaining bolts.
  2.  
  3. Reconnect the two water by pass hoses and the vacuum hoses to the idle speed control valve body.
  4.  
  5. Attach the two idle speed valve connectors and refill the engine coolant.
  6.  

TESTING





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Fig. Fig. 1 To test the idle speed control valve, measure the resistance with an ohmmeter between the terminals



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Fig. Fig. 2 Electronic component locations-1983-84 Cressida



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Fig. Fig. 3 Electronic component locations-1985-88 Cressida



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Fig. Fig. 4 Electronic component locations-1989-90 Cressida

  1. Using an ohmmeter, measure the resistance between terminals B1-S1 or S3 and B2-S2 or S4. The resistance should be as follows:

    B1-S1 or S3: 10-30 omega
     
    B2-S2 or S4: 10-30 omega
     

  2.  
  3. After making the resistance test, apply battery voltage to terminals B1 and B1 and while repeatedly grounding terminals S1, S2, S3 S4 and S1 in sequence, check that the valve moves toward the closed position.
  4.  
  5. Apply battery voltage to terminals B1 and B2 and while repeatedly ground S4-S3-S2-S1 and in sequence, check that the valve moves toward the open position.
  6.  
  7. If the idle speed control valve fails any of this inspection, replace it with a new one.
  8.  

 
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