Open Loop/CEL?

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Nov 13, 2011 | 04:56 PM

s13hero

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From: Las Vegas, NV, USA

Open Loop/CEL?

Does any CEL code always mean the ECU is open loop regardless of the CEL? Specifically I'm asking for my 95 Dx hatch, stock motor and ECU.

Nov 13, 2011 | 05:09 PM

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Re: Open Loop/CEL?

Open loop simply means the ECU ignores inputs from the O2 sensor and instead uses a pre-programmed mode for the fuel trim. Is this what you mean?

Nov 13, 2011 | 05:13 PM

s13hero

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From: Las Vegas, NV, USA

Re: Open Loop/CEL?

Yes, I had read that when there is a CEL present, the ECU is running in open loop mode and I was curious if this was for all CELs, which seems odd to me, or only those from the O2 sensor, etc.

Nov 13, 2011 | 05:16 PM

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Re: Open Loop/CEL?

I would think that some but not all CEL codes cause the ECU to run in open loop or limp mode.

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