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Re: P2127 code on 2007 Saturn Ion 2.2
Posted to Technical Discussion Forum on 8/24/2020 1 Reply

Hi Tony. Yes, the 5 V Ref circuits are identified 5V 1 and 5V 2 on the schematics.

Just like fused lighting circuits, there are rules to follow regarding control circuitry, where a failure in one circuit cannot affect another critical system.

Here's a glim... Login to read more.

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