GS400, LS400 & SC400
Remove engine cover. Remove battery cover and air cleaner tube. Drain coolant. Remove throttle body. See appropriate THROTTLE BODY in REMOVE/INSTALL/OVERHAUL article. Remove ECT sensor. See REMOVAL & INSTALLATION article. With sensing portion of ECT sensor submerged in water, measure resistance between terminals. See Figure. Replace ECT sensor if resistance is not as specified. See ECT SENSOR RESISTANCE table.
ECT SENSOR RESISTANCE
| Application & Temperature °F (°C) | (1) Ohms | ||
|---|---|---|---|
| -4 (-20) | 10,000-20,000 | ||
| 32 (0) | 4000-7000 | ||
| 68 (20) | 2000-3000 | ||
| 104 (40) | 800-1200 | ||
| 140 (60) | 400-750 | ||
| 176 (80) | 200-400 | ||
| 212 (100) | 120-250 | ||
|
|||