Thread: P0340 code
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Old 11-17-2017, 01:10 AM   #8
fetchitfido
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Join Date: May 2006
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2001 SC2
Default Re: P0340 code

It's a FSM document, it assumes the user has a Tech II so I assume it's one of the tests you can run using said Tech II. Knock-offs/alternatives may do the same test just under a different name. What ever tool you have, to properly do the diagnostics it needs to be able to read "CMP Resync Counter" and monitor which cylinder is misfiring.

U1301 indicates a voltage issue with the data link between the PCM, BCM and ABS control module. Nothing directly to do with a misfire (but it hints at an issue with those modules, one of which could cause misfires if it's bad).

P0340 indicates a voltage issue with the ICM to the PCM (yes, it's more complicated than that but basically thats what it is)

P0300 indicates something other than a voltage issue, petty much anything from a vacuum leak to water in the fuel.

1st 3 attached pages are P0300, the rest are U1301.
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