Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA1996TERCEL DX, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMIDLE AIR CONTROL (IAC) VALVE
1996 Toyota Tercel DX, 4D Sedan, Automatic
Idle Air Control (IAC) Valve
1996 Toyota Tercel DX, 4D Sedan, AutomaticSECTION Idle Air Control (IAC) Valve
- Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ADJUSTMENTS article.
- 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 RPM.NOTE: Data link connector No. 1 is located in engine compartment.
- 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.
- On all other models, engine RPM should increase to specified 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 Tercel 900-1300 - On all models, if engine RPM is not as specified, test IAC valve resistance and operation. If engine RPM is within specification, remove jumper wire. Turn ignition off.
- To test IAC valve resistance, ensure ignition is off. Disconnect electrical connector from IAC valve, located on lower area of throttle body. Using ohmmeter, check resistance between terminal +B and each remaining terminal. See Fig 2.
- Replace IAC valve if resistance is not within specification. See IAC VALVE RESISTANCE SPECIFICATIONS table.IAC VALVE RESISTANCE SPECIFICATIONS
Application Ohms Cold (1) 17.0-24.5 Hot (2) 21.5-28.5 (1) Cold is with temperature of 14-122°F (-10 - 50°C). (2) Hot is with temperature of 122-212°F (50-100°C). - To test IAC valve operation, remove IAC valve from throttle body. Apply battery voltage to +B terminal on IAC valve. Apply battery ground to proper terminal and ensure valve opens and closes. See Figure. Replace IAC valve if defective.
- If IAC valve resistance is within specification and operates correctly, check wiring circuit between Engine Control Module (ECM) and IAC valve. See ECM LOCATION table. See appropriate wiring diagram in WIRING DIAGRAMS article.
ECM LOCATION
| Model | Location |
|---|---|
| Tercel | Behind Glove Box |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
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.