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Knock sensor (178a-178b), E39

Knock sensor (178a-178b), E39

Location

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.

Main task

Transmits information on knocking to the ECM.

Type

Knock sensors 178a and 178b are the same except for their cable length.


Connection

178a pin no Signal type Description
A Signal Connected to ECM pin 36(B).
B Ground Connected to ECM pin 56(B).


178b pin no Signal type Description
A Signal Connected to ECM pin 37(B).
B Ground Connected to ECM pin 57(B).



The knock sensors communicate with the ECM, control module, E39 (590).