How to fix the inaccurate water temperature gauge

How to fix the inaccurate water temperature gauge.
Model: Hyundai Santa Fe
Year Model: 2002
Fuel: Diesel
Displacement: 2000cc
1) Condition

1. Coolant temperature gauge indicates different level whenever the ignition key is turned ‘ON’ and ‘OFF’
   =The gauge indicates lower level than normal.

2) Cause

1. Malfunction of engine coolant temperature sensor.\

3) Diagnosis

1. Check the coolant temperature sensor ground condition and the circuit
   =Trouble not found.
2. Check the coolant temperature sensor output voltage.
   =Turn the key ‘ON’ and ‘OFF’ repeatedly.
   signal voltage shows 1.2 volts(if normal,2.5 voltage).
3. After replacing the coolant temperature sensor, the gauge operates normally.

4) Repair Guides

• Replace the coolant temperature sensor.

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