As some here know ( as they were involved), the AEM 30-0334 OBDII enabled wideband was, originally, a project, developed here, on this forum. Basically, it was a partial re-programming of the AEM 30-0300 wideband?s CAN interface to conform to the OBDII standard communications. This allowed the modified 30-0300?s and, later, the proper 30-0334s, to interface, directly, with the HPTuners MPVI/MPVI2 scanners, via the OBDII pass-thru cable. And there was much rejoicing.
But, there was one small(ish) issue. As the 30-0300 was, originally, designed to use its CAN interface for the AEMNet protocol, it did not include the hardware required to interface with vehicles that did not have CAN based ECUs. i.e. most vehicles, prior to 2007.
This left tuners of 1996-2007 OBDII vehicles, which used the J1850 ( VPW and PWM ) interfaces, to fend for themselves, in getting wideband data into the scanners. Either using the Pro version, with the ProLink CAN (which is ideal ), serial data, or, the old AC/EGR analog wiring tricks, each of which have their own issues; and, make dual-channel widebands very difficult to log.
So, having done most of the technical legwork, I am testing the waters here to see how many people would actually be interested in a 30-0334-like solution for the pre-CAN vehicles; specifically, earlier GM, Ford, and Chrysler products that use the J1850 variants, on the OBDII bus.
This would be an extra piece of hardware (as the 30-0300 does not have a J1850 interface) that would take the place of the pass-thru connector cable, used by the 30-0334. It would look like this ( as I already have the housings ) but, with terminals to connect the CAN wires from the wideband(s).
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It would have the screw-terminals on one side, for the 30-0300 or 30-0310 CANH and CANL wires; and, would allow multiple widebands to be attached and logged, together. I will, probably add a cold-start safety function, as an option, to prevent thermal shock to the sensor?s ceramic elements. i.e. it would not start heating up the sensors until after the engine is stated.
That, pretty much, covers it; a J1850-enabled OBDII adapter for the AEM 30-0300 and 30-0310 widebands.
Looking at the current chip market, it looks like the pricing would be in the $70 to $80 range, depending on the demand volume. But, you do save the cost difference between the 30-0334 and the 30-0300/0310.
So, sharks? how many are up for a direct OBDII cable wideband adapter for the pre-CAN vehicles ( 1996-2007 ) ? This would, obviously, take a bit to get debugged and into production.
'cause I can never "just leave well enough alone."
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. That is pre- MPVI. So, I assume that it should work with the original MPVI ( Which I also have, for testing ). In theory, the device has no idea what interface is connected to it. I just acts like a J1850 node.
Also, the OBD2 DLC connector can provider a maximum of 4A, which just covers the heat-up cycle of one wideband. Two, would, probably, blow the 5A fuse, pretty quickly.
) or, anything else that does not use the AEMNet CAN protocol. 
Originally Posted by dr.mike
