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Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » CAT Temps From Multiple Sensors Identical

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Author Topic: CAT Temps From Multiple Sensors Identical
Elvota
Member
Posts: 8
Post CAT Temps From Multiple Sensors Identical
on: September 2, 2019 (GMT)

Why would catalyst temperatures for B1S1, B2S1 always read EXACTLY the same… and catalyst temperatures for B1S2, B2S2 always read EXACTLY the same? Shouldn’t they vary somewhat? I mean to say… don’t identical readings seem to imply the signals are all coming from one sensor instead of two individual sensors?

Example:
B1S1 Temp: 824.54
B2S1 Temp: 824.54

B1S2 Temp: 516.56
B2S2 Temp: 516.56

The readings will fluctuate… but always be exactly the same as each other from both banks.

Thanks in advance.
Capp777
Member
Posts: 2993
Post Re: CAT Temps From Multiple Sensors Identical
on: September 3, 2019 (GMT)

According to Torquescan they should be from
different OBD pids. If you create your own
custom pids, they could be tested for the
vehicles hex response to see if it is the same.
moreause
Member
Posts: 637
Post Re: CAT Temps From Multiple Sensors Identical
on: September 3, 2019 (GMT)

cat temperature is calculated not measured
in most car i have seen

i suspect both side are seeing the same power output lol
so same value
Elvota
Member
Posts: 8
Post Re: CAT Temps From Multiple Sensors Identical
on: September 3, 2019 (GMT)

Quote from moreause on September 3, 2019
cat temperature is calculated not measured
in most car i have seen

i suspect both side are seeing the same power output lol
so same value

Thank you for the ideas and input… much appreciated.

I looked deeper at the numbers and by logging a drive I noticed very subtle differences actually do show up on occasion… so that would match your suspicions.
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