OBD 1.5 questions - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-17-2009, 09:03 PM   #1
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Question OBD 1.5 questions

whats makes it different from OBD 1? also, are there any tuning options available for a 95 ssei running OBD 1.5?
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Old 01-17-2009, 09:06 PM   #2
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go here and read up on it:
TripAtlas.com - About On-Board_Diagnostics

also google for gmtuners or sinister performance for all your tuning needs

wow I just sounded like a commercial..lol
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Old 01-18-2009, 12:16 AM   #3
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Old 01-18-2009, 12:17 AM   #4
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Old 01-18-2009, 12:18 AM   #5
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your covered...have fun

Quote:
1992-95 3800 Series 1 Supercharged (cars)
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Old 01-18-2009, 12:20 AM   #6
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Quote:
Originally Posted by theedgeofsanity View Post
whats makes it different from OBD 1?
here ya go:
Quote:
OBD-I


The regulatory intent of OBD-I was to encourage auto manufacturers to design reliable emission control systems that remain effective for the vehicle'* "useful life". The hope was that by forcing annual emissions testing for 'California', and denying registration to vehicles that did not pass, drivers would tend to purchase vehicles that would more reliably pass the test. Along these lines, OBD-I was largely unsuccessful—the means of reporting emissions-specific diagnostic information was not standardized. Technical difficulties with obtaining standardized and reliable emissions information from all vehicles led to an inability to effectively implement the annual testing program.
OBD 1.5


"OBD 1.5" is a slang term referring to a partial implementation of OBD-II which GM used on some vehicles in 1994 and 1995 (GM did not use the term OBD 1.5 in the documentation for these vehicles - they simply have an OBD and an OBD-II section in the service manual.) This hybrid system was present on the H-body cars in 94-95, L-body (Beretta/Corsica) in 94-95, Y-body (Corvette) in 94-95, on the F-body (Camaro and Firebird) in 95 and on the J-Body (Cavalier and Sunfire) and N-Body (Buick Skylark, Oldsmobile Achieva, Pontiac Grand Am) in 95.
Depending on the year and the vehicle, a car with the OBD 1.5 system may have either the older OBD-I connector, or the newer OBD-II connector, but they are electrically identical to each other. For example, the 94-95 Corvettes have one post-cat oxygen sensor (although they have two catalytic converters), and have a subset of the OBD-II codes implemented. For a 1994 Corvette the implemented OBD-II codes are P0116-P0118, P0131-P0135, P0151-P0155, P0158, P0160-P0161, P0171-P0175, P0420, P1114-P1115, P1133, P1153 and P1158.[1]
The pinout for the ALDL connection on these cars is as follows:

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16
For ALDL connections, pin 9 is the data stream, pins 4 and 5 are ground and pin 16 is battery voltage.
Additional vehicle-specific diagnostic and control circuits are available on this connector. For instance, on the Corvette there are interfaces for the Class 2 serial data stream from the PCM, the CCM diagnostic terminal, the radio data stream, the airbag system, the selective ride control system, the low tire pressure warning system and the passive keyless entry system.[1]
An OBD1.5 has also been used on Mitsubishi cars of '95 '97 vintage.
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