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Mercedes Benz
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1987
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300E (124.030) L6-3.0L (103.983)
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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On/Off Ratio Tester
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On-Off Ratio: 30%
On-Off Ratio: 30%
1.
Faulty circuit (either open or shorted) between coolant temp. sensor and ECU.
2.
Defective coolant temp. sensor.
TEST:
Coolant temp. sensor.