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HOMESERVICE MANUALSTOYOTA1994TERCEL DX, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMIDLE-UP SYSTEMTERCEL
1994 Toyota Tercel DX, 4D Sedan, Standard

Idle-Up System: Tercel

1994 Toyota Tercel DX, 4D Sedan, StandardSECTION Tercel
  1. Remove idle-up Vacuum Switching Valve (VSV). Idle-up VSV is center VSV, located near end of valve cover on passenger's side.
    NOTE: The idle-up VSV may also be identified using appropriate illustration in THEORY/OPERATION article or wire color. See appropriate wiring diagram in articles listed below:
  2. Using ohmmeter, check resistance and for continuity between idle-up VSV electrical terminals. Replace idle-up VSV if resistance is not 37-44 ohms or continuity does not exist.
  3. Ensure no continuity exists between each electrical terminal and body of idle-up VSV body. To check idle-up VSV operation, apply air pressure to designated area and checking air passage, and then applying battery voltage and ground and retesting. See Fig 1. Replace idle-up VSV if defective.
Fig 1: Testing Idle-Up VSV (Tercel)
G93I80125Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.