ox66 5v ref on sensors

[onttr222]

Should all sensors have 5v ref on them when their plugged in and probed with the ignition on?

I'm finding my knock and IAT do not have 5v.

Knock is showing 3.3 and IAT 2.8v.

Unplug them and the feeds to them have 5v

[99yam40]

Something is drawing it down, just need to find what it is

[onttr222]

I unplugged every other sensor and nothing changed. Ill keep unplugging coils etc.

Is it possible those two sensors are bad?

[greasyshaft]

What's the actual problem?

model code would be handy too

A knock sensor is a Piezo-electric crystal, it generates a voltage at engine knocking.

[rodbolt17]

if the sensor has an orange wire going to it it has a 5V ref.
if not test it per service manual.

[onttr222]

Thanks Rodbolt

So knock and IAT don't have 5v reference.