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Home >> Toyota >> 1993 >> Celica ST, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Air Control (IAC) Valve >> 2.2L 5S-FE

2.2L 5S-FE

  1. Warm engine to normal operating temperature. Ensure idle speed is correct. See ADJUSTMENTS article.
  2. Apply parking brake and place transmission/transaxle in Neutral. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 of data link connector No. 1. See Fig 1. Start engine and note engine RPM.
    NOTE: Data link connector No. 1 is located in engine compartment on all models except Previa. On Previa, data link connector No. 1 is located under below driver's seat.
  3. On Previa, engine RPM should increase to specified engine RPM for 5 seconds and then decrease approximately 200 RPM. See IAC VALVE ENGINE SPEED TESTING SPECIFICATIONS  table.
  4. On all other models, engine RPM should increase to specified engine RPM for 5 seconds, and then return to idle. See IAC VALVE ENGINE SPEED TESTING SPECIFICATIONS  table.
    IAC VALVE ENGINE SPEED TESTING SPECIFICATIONS

    Application Engine RPM
    All 900-1300
  5. If engine RPM is not as specified, check IAC valve resistance and operation. If engine RPM is within specification, remove jumper wire. Turn ignition off.
  6. To check IAC valve resistance, ensure ignition is off. Disconnect electrical connector from IAC valve located on lower area of throttle body. Using ohmmeter, measure resistance between terminal B+ and each remaining terminal. See Fig 2 and Fig 3.
  7. Replace IAC valve if resistance is not within specification. See IAC VALVE RESISTANCE SPECIFICATIONS  table.
    NOTE: Information is not available from manufacturer for checking IAC valve operation for Previa.
  8. Remove IAC valve from throttle body. See appropriate N - REMOVE/INSTALL/OHAUL article. Connect battery voltage and ground to proper terminals and ensure valve opens and closes. See Fig 4 and Fig 5. Replace IAC valve if defective.
  9. If IAC valve resistance is correct and operates correctly, check wiring circuit between Engine Control Module (ECM) and IAC valve. See ECM LOCATION table below. See appropriate wiring diagram in WIRING DIAGRAMS article.
IAC VALVE RESISTANCE SPECIFICATIONS

Application Ohms
Turbo & 2.2L 5S-FE 19.3-22.3
ECM LOCATION

Model Location
Celica Bottom Center Of Dash, In Front Of Console
Fig 1: Using Jumper Wire In Data Link Connector No. 1 (1.6L 4A-FE & 2.2L 5S-FE
G93A80127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Checking IAC Valve Resistance (2.2L 5S-FE)
G93G80131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Checking IAC Valve Resistance (Turbo)
G93H80132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Checking IAC Valve Operation (2.2L 5S-FE)
G93A80135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Checking IAC Valve Operation (Turbo)
G93B80136Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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