Keep getting a check engine light with the code P1600. The code indicates that the ECM detected an unexpected voltage in the battery backup circuit (keeping-alive memory). I replaced the ECM and I am still getting the same code after clearing it. I have been trying to figure this out for a couple weeks. Also replaced EFI fuse and OBD fuses for troubleshooting. Any help is greatly appreciated!
1998 corolla ECM issue
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