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Coolant Temperature Sensor (CTS) Test

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