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Old 01-29-2008, 10:45 AM   #1
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Default OBD I or II?

My suburban has the OBD I connector, but the pins are not the same as the OBD I in my 89 bonnie. Do I have the combo OBD II system with the OBD I connector? If so, can I convert the connector to OBD II?
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Old 01-29-2008, 11:38 AM   #2
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You have the hybrid OBD 1.5. No OBD1 or OBD 2 reader can scan it either.

Not too sure on the Suburbans, but at least on our cars, converting is a pain in the arse. (I'm doing it now, and even then it might not be successful).
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Old 01-29-2008, 11:47 AM   #3
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I don't believe Matt'* 'burb is OBD1.5. The hybrid PCM didn't hit all GM vehicles. Matt, last time I checked, my CP9110'* will read up through the 95 GM trucks.
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Old 01-29-2008, 12:22 PM   #4
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Pulled this from Wiki. Doesn't mention the trucks, but the second paragraph goes along the lines of his first post:

Quote:
OBD 1.5
See also List of ODB-II Vehicles.
"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 (Chevrolet Beretta / Chevrolet Corsica) in 94-95, Y-body (Chevrolet Corvette) in 94-95, on the F-body (Chevrolet Camaro and Pontiac Firebird) in 95 and on the J-Body (Chevrolet Cavalier and Pontiac 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
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Old 01-29-2008, 04:38 PM   #5
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well, if you don't mind Bill, I'll bring it down in Feb and we can scan it.
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Old 01-29-2008, 07:37 PM   #6
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The 1995 ALDL system does not have the Diagnostic pin... Instead the Scantool will communicate through the data line

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Old 07-29-2011, 04:08 PM   #7
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94' bonnie se 3.8L..has 16 pin connector w/a obd1 database
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