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‒ Check the specification for coolant temperaturesender (display zone 2):
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Display zones
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1
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2
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3
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4
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Display group 1: Idling test
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Display
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xxxx rpm
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xxx.x °C
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xx.x%
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xx.x <°
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Indicated
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Engine speed
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Coolant temperature
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Lambda control
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Ignition angle
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Working range
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800...6000 rpm
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-46.5...141.0 °C
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-25.0...25.0 %
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0.0...50.0 <°
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Specification
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0 rpm
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Approx. ambient temperature1)
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The value must fluctuate at least 3 % in range -5.0...5.0 %
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2.0...15.0 <°
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If specification is not attained
,
evaluating display group 1
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---
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1)
If a temperature is displayed which deviates greatly from the ambient temperature of the sender, check sender wiring for transfer resistances/open circuit.
Continuation:
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‒ Start engine and run at idling speed.
The temperature value must
increase uniformly
If the specification is not obtained:
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‒ Replace coolant temperature sender (G62).
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‒ Press ⇒key.
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‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
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‒ Switch off ignition.
Notes:
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◆ Display on fault reader jumps by 1.5 °C
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◆ If irregular engine running occurs in certain temperature ranges and the temperature figure does not increase without interruption, the temperature signal is temporarily interrupted and the sender must be renewed.
Evaluating display group 1
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Display group: 1
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Display zone: 2
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Possible fault cause
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Fault elimination
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Approx. -46.6 °C
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Wiring open circuit or short to positive
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- Check wiring => Page 24-93
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Approx. 141.0 °C
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Short to earth
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Checking wiring
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