Corolla & Tercel
- Start engine and warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in appropriate D - ADJUSTMENTS article.
- Turn ignition off. Apply parking brake and place transaxle in Neutral. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 on DLC-1. (Scheme 154)and (Scheme 155). DLC-1 is located at driver's side of engine compartment, near strut tower.
- Start engine and note engine RPM. After engine RPM is kept at 900-1300 RPM for 5 seconds, ensure engine returns to idle speed. If engine speed is not as specified, test IAC valve operation. If engine speed is as specified, remove jumper wire. Turn ignition off.
- To test IAC valve operation, remove IAC valve from throttle body. See appropriate N - REMOVE/INSTALL/OVERHAUL article. Check that valve on inside of IAC valve is half open. (Scheme 156) Reinstall electrical connector on IAC valve.
- Disconnect electrical connector from Engine Coolant Temperature (ECT) sensor. See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION»(ref-95581-S24171904822001040200000) table. ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOCATION Model Location Corolla On Flywheel End Of Cylinder Head Below Ignition Coil & Contains Dark Gray 2-Pin Electrical Connector With White & Brown Wires Tercel On Coolant Housing At Flywheel End Of Cylinder Head & Contains Dark Gray 2-Pin Electrical Connector With Black/Red & Brown Wires
- Turn ignition on. Check that valve on inside of IAC valve moves. Repeatedly disconnect and reconnect electrical connector for IAC valve several times while checking that valve on inside of IAC valve opens and closes. (Scheme 156)
- Turn ignition off. Reinstall electrical connector on ECT sensor. Remove jumper wire.
- If IAC valve operates, wiring circuit, Engine Control Module (ECM) and IAC valve are okay. If IAC valve does not operate, check wiring circuit between the ECM and the IAC valve. Refer to the «ECM LOCATION (TABLE 3)»(ref-95581-S14451250532001040200000) table. See appropriate wiring diagram in L - WIRING DIAGRAMS article. If wiring circuit and ECM are okay, replace IAC valve.
| Model | Location |
|---|---|
| Camry | Behind Glove Box |
| Celica | Below Passenger's Side Of Instrument Panel, Underneath Carpet Near Center Console |
| Corolla | Behind Stereo On Instrument Panel, Just In Front Of Center Console |
| RAV4 | Behind Instrument Panel, Near Front Of Center Console |
| Tacoma & Tercel | Behind Glove Box |
| T100 | Behind Passenger's Side Kick Panel |
| 4Runner | Behind Glove Box |
ECM LOCATION (TABLE 3)
