Toyota Corolla 1988-1997 Repair Guide

Idle-Up System

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TESTING



See Figures 1 and 2



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Fig. Fig. 1: Schematic of the idle-up system circuit

  1. Make sure all accessories are off.
  2.  
  3. Test the VSV using a voltmeter, check the meter indicates battery voltage during cranking and fir ten seconds after starting.
  4.  
  5. If it is not as specified, replace the VSV.
  6.  
  7. Check that air does not blow from pipe E to F.
  8.  



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Fig. Fig. 2: Blow air into pipe E and check that it flows into pipe F of the VSV

  1. Apply battery voltage across the terminals. Check that air flows from pipe E to F.
  2.  
  3. If operation is not as specified, replace the VSV.
  4.  

REMOVAL & INSTALLATION



Replacing the various vacuum switches simply requires unplugging the vacuum and/or electrical connections, then unbolting the switch. Inspect the vacuum hose over its entire length for any signs of cracking or splitting. The slightest leak can cause improper operation.

 
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