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2-3-1 and 2-2-1 200

posted by  Grey245 on  Sat Feb 27 07:10 CST 2021
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The -949 ECU in my B200F/M47 245 (entry level engine in some markets) is throwing a CEL combined with a 2-3-1 and 2-2-1 error codes.
A reset by interrupting the power supply momentarily erased these codes for quite a while before they came back.

I also have a -561 lying around and I swapped it in. After a while a 2-3-1 was stored, however without a CEL nor a 2-2-1. It does light the CEL every time the ignition is turned on so at least bulb and ECU-output for that light are OK.

The 2-2-1 seems to point to lean running. However, I am not experiencing any of the expected symptoms, like starting problems and the spark plugs have a nice colour (they're nearing the 12,000 mi change interval).

A couple of quiestions: why the difference between the -561 and -949 ECUs?
Might this be related to the high idle problem I am having?
If so, how does a lean mixture lead to a higher than normal idle?






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