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CTS Test

  1. Disconnect the wire harness connector from the CTS switch. Test the resistance of the sensor with a high impedance digital ohmmeter. The resistance should be less than 1000 ohms with the engine warm. See CTS & MAT SENSOR TEMPERATURE-TO-RESISTANCE VALUES  chart.
  2. Test the resistance of the wire harness between ECU terminal D-3 and the sensor connector terminal. Repeat the test at terminal C-10 of the ECU and the sensor connector terminal. Repair the wire harness if an open circuit is indicated. See CTS & MAT SENSOR TEMPERATURE-TO-RESISTANCE VALUES  chart.
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