Understanding OBD1 and OBD2 in Honda Vehicles
OBD1 and OBD2 refer to the different onboard diagnostics systems used in Honda vehicles. Here’s a breakdown of the key differences and characteristics of OBD1 and OBD2:
OBD1:
– OBD1 was introduced in the early 1990s and was used in Honda vehicles made up to 1996 to control emissions and other functions.
– It is less restricted by emissions and involves fewer O2 sensors compared to OBD2.
– OBD1 uses one O2 sensor and is generally considered simpler and easier to use than OBD2.
– It is known for being super reliable, and if something goes wrong, it’s easy to check codes.
– OBD1 ECUs use internal program memory by default, but space for external ROMs can be enabled by adding several components along with a ROM chip.
OBD2:
– OBD2 was introduced in the mid-1990s and is used in 1996 and newer Honda vehicles.
– It has more sensors and monitors than OBD1, providing more detailed information about the vehicle’s performance.
– OBD2 uses two O2 sensors and is known for its good tuning options, although most people use a jumper harness to use OBD1 ECUs, often reprogrammed into their OBD2a or OBD2b cars.
– OBD2 ECUs are based on the 665XX series MCUs and are extremely integrated.
Identifying OBD1 and OBD2 in Honda Vehicles
To determine whether a Honda vehicle is OBD1 or OBD2, one can look at the ECU plugs. If the plugs are gray colored and have only two rows left to right of pins, it’s OBD1. Additionally, the number of O2 sensors used can also help identify whether the vehicle is OBD1 or OBD2, with OBD1 using one O2 sensor and OBD2 using two.
Converting Between OBD1 and OBD2
It’s possible to convert between OBD1 and OBD2 in Honda vehicles. For example, it’s popular to convert an OBD2 ECU to OBD1, and it’s often done to gain more power due to less restriction on emissions. Additionally, it’s mentioned that any Honda engine OBD0, OBD1, or OBD2 can be converted to each other by exchanging distributor, fuel injectors, and alternators with the correct ones.
In summary, OBD1 and OBD2 are different onboard diagnostics systems used in Honda vehicles, with OBD1 being less restricted by emissions and simpler to use, while OBD2 provides more detailed information about the vehicle’s performance.
If you have a specific Honda vehicle and need assistance in determining its OBD system or making conversions, feel free to provide more details, and I’d be happy to assist further!
Contents
What Hondas have OBD1?
Technical Information OBDI Vehicle Reference
| Model | Year | Suitable OBD1 ECUs |
|---|---|---|
| Civic DX | 92-95 | P72,P28,P30,P61,P08J,P30J,P72J |
| Civic Si/EX/ | 92-95 | P72,P28,P30,P61,P08J,P30J,P72J |
| Civic HX | 96-99 | P74,P75,P06,PR4,P72,P28,P30,P61,P08J,P30J,P72J |
| Civic Si | 99-00 | P72,P28,P30,P61,P08J,P30J,P72J |
How do I know if my car is OBD1 or OBD2?
You can also determine what type of OBD your car is by looking at the interface system. The OBD1 interfaces are different and completely different. The standard OBD2 interface is a 16-pin connector. OBD2 interfaces are the same, so if the interface has 16-pin connector, so your car is OBD2.
Is my Honda OBD1 or obd2?
one good way is to know the year of the car. 92-95 is obd1 and 96 and up is obd2. another way is to pull your cup holder and there should be a service port there. if so, then you have an obd2 car but if not then its obd1 (courtesy of slipknot95758 ).
Is my Honda OBD1 or OBD2?
one good way is to know the year of the car. 92-95 is obd1 and 96 and up is obd2. another way is to pull your cup holder and there should be a service port there. if so, then you have an obd2 car but if not then its obd1 (courtesy of slipknot95758 ).
What vehicles have OBD1?
OBD1 was used in vehicles up to as late as 2006 and anything newer will be OBD2. Some vehicles manufactured earlier than 2006 are still OBD2 For example: You own a 2003 Toyota Corolla, this is OBD1.
How do I know if my Honda ECU is OBD1 or OBD2?
just look at the plugs. OBD1 has 3 plugs continuous and OBD2A has 3 plugs with a space between 1 of them. look for the code 37820-p72-A00 or A01…. A02 also?
What year did OBD1 stop?
If a car was made after 1996, it most likely has an OBD-II port so an OBD-I scanner won’t work with it. Another change between OBD-I and OBD-II is in the trouble codes. OBD-II systems access diagnostic trouble codes for Powertrain (Engine and transmission) and Emission Control Systems.
What year cars have OBD1?
On-Board Diagnostics – First Generation (OBD1)
With the exception of some 1994 and 1995 vehicles, most vehicles from 1982 to 1995 are equipped with some type of first-generation On-Board Diagnostics.
What year did OBD1 start?
1988
1988 — Standardization of on-board diagnostics came in the late 1980s after the 1988 SAE recommendation that called for a standard connector and set of diagnostics. 1991 — The state of California required all vehicles to have some form of basic on-board diagnostics. This is referred to as OBD I.
What year did Honda go to OBD2?
All 1996 and newer model year gasoline and alternate fuel passenger cars and trucks are required to have OBD II systems. All 1997 and newer model year diesel fueled passenger cars and trucks are also required to meet the OBD II requirements.
