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Old 12-16-2007, 08:37 PM   #1
Scooby Specialist
Member#: 34832
Join Date: Apr 2003
Chapter/Region: Tri-State
Location: was once a nut like me.
1989 M3

Default ecu Explorer reading 1v lower than rest of the car.. what gives?

ok I'm trying to trouble shoot an ongoing issue with my swap.

Here's whats happening:

battery reads 12v at terminals.
ECU reads 12v at various back pinned plugs.
OBD2 connector reads 12v at pin 1
When reading voltage through ecu explorer the voltage is 1v less than the ecu/battery is reading.
when trying to write a map to the ecu it fails because the voltage is below 12v.

what the hay is going on here? how does the obd2 readout in ecu explorer/ecuedit read 1v less than everything else?

how does the software/ecu obtain voltage? it doesnt seem to be off pin 1 on the obd2, so it must be coming in digitally from the ecu.. how does the ecu figure this value?

thank you for any help, I'm absolutely pulling my hair out.
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