Test 4: 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). If not okay, replace coolant temperature sensor. If okay, go to step 2). See Fig 1 .
- Check wire (Green/Red) between terminal No. 21 of CIS-E control unit plug to coolant sensor connector for continuity. Resistance should be about zero ohms (X). If not okay, repair interruption. If okay, test is complete.