SERVICE MANUAL
  Applies to: Hyundai Coupe/Tiburon 1998-2000
GROUP
Fuel System MFI Control System
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INSTALLATION 
  1. Apply sealant LOCTITE 962T or equivalent to threaded portion.

  1. Install engine coolant temperature sensor and tighten it to specified torque.

    TORQUE SPECIFICATION
    Engine coolant temperature sensor 15-20 Nm ( 150-200 kg·cm, 11-15 lb·ft )
  1. Connect the harness connector securely

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CIRCUIT DIAGRAM 
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DTC - P0116, P0117, P0118 (ECT SENSOR) 
TROUBLESHOOTING HINTS

If the fast idle speed is not high enough or the engine gives off dark smoke during the engine warm-up operation, it might be caused by the engine coolant temperature sensor.

USING VOLTMETER
Check item
Coolant temperature
Test specification
Engine coolant temperature sensor output voltage (ECT Sensor side connector No.2 or ECM harness side connector No.78)
When 0°C
4.05 V
When 20°C
3.44 V
When 40°C
2.72 V
When 80°C
1.25 V

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HARNESS INSPECTION PROCEDURES 
SENSOR INSPECTION
  1. Remove the engine coolant temperature sensor from the intake manifold.

  1. With temperature sensing portion of engine coolant temperature sensor immersed in hot water, check resistance.

    Temperature °C (°F)
    Resistance (kO)
    -30 (-22)
    22.22-31.78
    -10 (14)
    8.16-10.74
    0 (32)
    5.18-6.60
    20 (68)
    2.27-2.73
    40 (104)
    1.059-1.281
    60 (140)
    0.538-0.650
    80 (176)
    0.298-0.322
    90 (194)
    0.219-0.243
  1. If the resistance deviates from the standard value greatly, replace the sensor.

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ENGINE COOLANT TEMPERATURE (ECT) SENSOR 

The engine coolant temperature sensor is installed in the engine coolant passage of the cylinder head, detects engine coolant temperature and emits signals to the ECM. This part employs a Thermistor which is sensitive to, changes. in temperature. The electric resistance of a thermistor decreases in response to temperature rise. The ECM judges engine coolant temperature by the sensor output voltage and provides optimum fuel enrichment when the engine is cold.