what makes obd0... obdo
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Honda-Tech Member
Joined: Aug 2006
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From: brooklyn, ny
what makes obd0... obdo
i used the search...i go to a tech skool.in jamaica queens ...and all the teachers are old muscle car guys i tryd telling them about obdo and they say thers no such thing...my teachers words((( if it has a ecu...check lite.. and is fuel injected its obd1)) is ther a write up explaining this...? oow the tech question is... whats the diff of obd0 and obd1..( not asking for the ow vtec ) thanx ...
Pirate General...YARRRR
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From: Kills, United States
Re: what makes obd0... obdo (4dOoR-Ex)
Well you both are right, OBD0 is also known as pre OBD.
It's a form of an OBD, but not quite a true OBD per say... No offence but your book should cover this, as pre 1992 many cars, an in the case of this site Hondas had it.
I'm kind of lost though what exactly are you asking?
It's a form of an OBD, but not quite a true OBD per say... No offence but your book should cover this, as pre 1992 many cars, an in the case of this site Hondas had it.
I'm kind of lost though what exactly are you asking?
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Joined: Aug 2004
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From: Charleston, SC, USA
Re: what makes obd0... obdo (4dOoR-Ex)
they're sort of right. what is generally called "OBD-I" was originally legislated by CARB in 1987 or so for the 1988 model year. it wasn't even called OBD-I until OBD-II was created. based on that logic, all CARB-legal Hondas from 1988 to 1995 are OBD-I. problem is, there's no standard for OBD-I. connectors, capabilities, component locations, etc., all were up to the individual manufacturers.
what this ignores is Honda's change in ecu/diagnostic technologies in 1992. there was a major generational change for Honda, but this had nothing to do with the industrywide OBD "standard." so, for ease of discussion, we call 92-95 Hondas OBD-I (because they came before OBD-II) and 88-91 OBD-0 (because they came before our definition of OBD-I).
in a similar case, some GM cars have what is often referred to as OBD-1.5.
the outside world doesn't see our distinctions - everything before OBD-II is OBD-I.
and this ignores the pre-88 injected cars that had their own OBD capabilities.
what this ignores is Honda's change in ecu/diagnostic technologies in 1992. there was a major generational change for Honda, but this had nothing to do with the industrywide OBD "standard." so, for ease of discussion, we call 92-95 Hondas OBD-I (because they came before OBD-II) and 88-91 OBD-0 (because they came before our definition of OBD-I).
in a similar case, some GM cars have what is often referred to as OBD-1.5.
the outside world doesn't see our distinctions - everything before OBD-II is OBD-I.
and this ignores the pre-88 injected cars that had their own OBD capabilities.
good explanation 
$cat /dev/urandom
Joined: Feb 2005
Posts: 3,152
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From: Thornton, colorado, usa
Re: what makes obd0... obdo (89efDUSTY)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jhota »</TD></TR><TR><TD CLASS="quote">they're sort of right. what is generally called "OBD-I" was originally legislated by CARB in 1987 or so for the 1988 model year. it wasn't even called OBD-I until OBD-II was created. based on that logic, all CARB-legal Hondas from 1988 to 1995 are OBD-I. problem is, there's no standard for OBD-I. connectors, capabilities, component locations, etc., all were up to the individual manufacturers.
what this ignores is Honda's change in ecu/diagnostic technologies in 1992. there was a major generational change for Honda, but this had nothing to do with the industrywide OBD "standard." so, for ease of discussion, we call 92-95 Hondas OBD-I (because they came before OBD-II) and 88-91 OBD-0 (because they came before our definition of OBD-I).
in a similar case, some GM cars have what is often referred to as OBD-1.5.
the outside world doesn't see our distinctions - everything before OBD-II is OBD-I.
and this ignores the pre-88 injected cars that had their own OBD capabilities.
</TD></TR></TABLE>
this is all correct. in addition, some standardizations were made with regard to sensor data output format. obd-0 sensors do not put out the same signal information as obd-1 and 2 sensors which may perform the same task.
The code base on which the diagnostic systems were built also saw generational improvements, with obd-1 have more diagnostic capability than obd-0. obd-1 also introduced the externally accessible diagnostic ports that are so common now.
obd-0 is also known as pre-obd in some circles..
http://pgmfi.org has lots of info on this subject.
what this ignores is Honda's change in ecu/diagnostic technologies in 1992. there was a major generational change for Honda, but this had nothing to do with the industrywide OBD "standard." so, for ease of discussion, we call 92-95 Hondas OBD-I (because they came before OBD-II) and 88-91 OBD-0 (because they came before our definition of OBD-I).
in a similar case, some GM cars have what is often referred to as OBD-1.5.
the outside world doesn't see our distinctions - everything before OBD-II is OBD-I.
and this ignores the pre-88 injected cars that had their own OBD capabilities.
</TD></TR></TABLE>
this is all correct. in addition, some standardizations were made with regard to sensor data output format. obd-0 sensors do not put out the same signal information as obd-1 and 2 sensors which may perform the same task.
The code base on which the diagnostic systems were built also saw generational improvements, with obd-1 have more diagnostic capability than obd-0. obd-1 also introduced the externally accessible diagnostic ports that are so common now.
obd-0 is also known as pre-obd in some circles..
http://pgmfi.org has lots of info on this subject.
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