Coolant Temperature Sensor Test (A) Test
- Unplug coolant temperature sensor. Test resistance from sensor terminal to ground. Idle speed will be correct with connection to ground or too high with an open. When testing for resistance values on sensors, use refer to coolant temperature sensor resistance chart. See Fig 1
. If not to specification, replace coolant temperature sensor. If okay, go to next step.NOTE: Always test sensors at two temperatures.
- Check wire (Green/Red) between terminal No. 21 of CIS-E control unit plug (located under dash on passenger's side) to coolant sensor connector for continuity. Resistance should be about zero ohms. If resistance is not zero ohms, repair open. If okay, test is complete.