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Home >> Jeep >> 1987 >> Comanche Base, 2.5 H, 4WD, Standard, AX5 >> Repair and Diagnosis >> Engine Performance >> System >> 2.5L TBI System >> Component Testing >> Coolant Temperature Sensor
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Coolant Temperature Sensor

  1. Disconnect wiring harness from CTS sensor. Test resistance of sensor. If resistance is not 185-100,700 ohms (3400 ohms at 70°F; 1600 ohms at 100°F), replace sensor. With engine warm, resistance should be less than 1000 ohms.
  2. Connect one ohmmeter lead to sensor connector terminal. Connect other lead, in turn to ECU harness connector terminals 15 and 32. Repair wiring harness if an open circuit is indicated.
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