Testing Coolant Temperature Sensor
- Unplug coolant temperature sensor. Test resistance from sensor terminal to ground (idle speed okay with connection to ground or too high with interruption). For nominal value see Fig 1 . If not okay, replace coolant temperature sensor. If okay, go to step 2).
- Check wire (Green/Red) between terminal No. 21 of CIS-E control unit plug to plug of coolant temperature sensor for continuity. Resistance should be about zero ohms. If not okay, repair interruption. If okay, test is complete.