Required Special Tool:
- MB992042: Engine coolant temperature sensor wrench
1. Remove the engine coolant temperature sensor using the special tool engine coolant temperature sensor wrench (MB992042).
2. With temperature sensing portion of the engine coolant temperature sensor immersed in the hot water, measure the resistance between connector terminals.Standard value:
- 14 – 17 kΩ [at –20°C (-4°F)]
- 5.1 – 6.5 kΩ [at 0°C (32°F)] (reference value)
- 2.1 – 2.7 kΩ [at 20°C (68°F)]
- 0.9 – 1.3 kΩ [at 40°C (104°F)] (reference value)
- 0.48 – 0.68 kΩ [at 60°C (140°F)] (reference value)
- 0.26 – 0.36 kΩ [at 80°C (176°F)]
| note | The value in square brackets is only advisory. |
3. If the resistance deviates from the standard value greatly, replace the sensor.
4. Apply the sealant over the screw sections on the engine coolant temperature sensor.Specified sealant: Three bond 1324N, LOCTITE® 262 or equivalent
5. With the special tool engine coolant temperature sensor wrench (MB992042) tighten the engine coolant temperature sensor to the specified torque. Tightening torque: 30 ± 9 N·m (22 ± 6 ft–lb)
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