Knock sensor (178a-178b), E39
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Knock sensor (178a-178b), E39
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Links: Knock sensor (178a-178b), E39.
The knock sensors are mounted on the front of the engine block. 178a, on its right side and 178b, on its left.
Transmits information on knocking to the ECM.
Knock sensors 178a and 178b are the same except for their cable length.
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178a pin no
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Signal type
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Description
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A
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Signal
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Connected to ECM pin 36(B).
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B
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Ground
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Connected to ECM pin 56(B).
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178b pin no
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Signal type
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Description
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A
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Signal
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Connected to ECM pin 37(B).
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B
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Ground
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Connected to ECM pin 57(B).
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The knock sensors communicate with the ECM, control module, E39 (590).
