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Diagnostics Scanner

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14 Aug 2019 23:15 #32826 by randy61
Diagnostics Scanner was created by randy61
What type of scanner is there that does NOT have to be connected to the OBD port connector in order to read sensors, fuel trims and injectors?

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14 Aug 2019 23:16 #32827 by randy61
Replied by randy61 on topic Diagnostics Scanner

randy61 wrote: What type of scanner is there that does NOT have to be connected to the OBD port connector in order to read sensors, fuel trims and injectors?

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15 Aug 2019 06:22 #32832 by Noah
Replied by Noah on topic Diagnostics Scanner
A scanner, by definition must be plugged into an OBD port.
OBD standing for on board diagnostics.
after 1996, US vehicles adhere to OBD2 protocol and have a standardized OBD port.
Older vehicles have non standardized ports for factory level scan tools.

So every scanner needs to be plugged into an OBD port, even if it is not the standard plug that we recognize today.

Many scan tools have adapters to connect to pre OBD2 vehicles (snap on , launch, Bosch), but I have very seldom had the need to use them and any time I have, the data and codes available were severely lacking in providing diagnostic direction.

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15 Aug 2019 07:09 #32833 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Diagnostics Scanner
Pre OBD2 it was OBD1 and by legal requirement all that was stored was a few very general fault codes that were manuafacturer specific, there was no requirement for live data from sensors

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15 Aug 2019 15:53 #32843 by randy61
Replied by randy61 on topic Diagnostics Scanner
I have a 1990 jeep Cherokee which it is pre obd. No codes or any data storage. So basically I would have to rely on a DMM... correct?

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15 Aug 2019 16:04 #32844 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Diagnostics Scanner

" Welcome to the 21st"


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16 Aug 2019 13:31 - 16 Aug 2019 13:35 #32860 by randy61
Replied by randy61 on topic Diagnostics Scanner
The 90 Cherokee computer does not store or throw codes. It is not OBD1 or 2.
There are no flash codes either. That only worked with newer Cherokee's after 91.
That is a big misconception going around on the internet that flash codes can be had by turning key on and off for 87-90 Cherokee's.
Last edit: 16 Aug 2019 13:35 by randy61.

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