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P1600 causing engine light on warning. Replaced by another ECM same problem. Checked the voltage between ECM Batt pin (2nd pin from right). It is 12.3 volt. No sure what to do next

Vehicle: 2000 toyota, sienna 3.0 ce

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P1600 Open in power back up circuit

If the ECM was replaced and you are still having P1600 the next step is with the EFI.You now need to search for a open from the EFI fuse to ECM.

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