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Old 11-18-2020, 04:59 AM
Bmwe5320023.0 Bmwe5320023.0 is offline
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After much pain I think I figured it out, at least for sensor 1 bank 1.

Pin 3 of the O2 connector goes to pin 20 of the DME (20 M M_LSV1 Signal ground Oxygen sensor 1 (in front of catalytic converter))
20 Ground O2 Sensor Pre-Cat Bank 1
Black wire (so looks like this wire is simply ground and is not critical, since the O2 sensor is already grounded by being screwed into the cat.

Pin 4 of O2 connector goes to pin 14 of DME E A_LSV1 Sensor signal Oxygen sensor 1 (in front of catalytic converter)
14 Input [0-5V] Signal O2 Sensor Pre-Cat Bank 1
This wire is yellow. Looks like this is where DME is receiving the signal from O2 sensor, which will produce volts depending on temperature. The only think not clear to me is I thought O2 sensor provides between 0 and 1 volts, so why does this day 0-5V?

Pin 2 of O2 connector goes to pin 1 on the DME
1 M T_LHV1 Oxygen sensor heating ground
1 Output [PWM] O2 Sensor Heater Pre-Cat Bank 1
Brown wire
Something to do with pulse width modulation. I think it does something to the voltage.

Last is pin 1 on O2 connector and it goes to pin 8 of the DME fusebox, which is Voltage supply for engine electrical system, fuse 4, 30 amp
Red and white wire
So I figure this is the voltage from O2 sensor to DME, passing through that fusebox?

I guess I can start by checking fuse 4 and then checking resistance between DME connector pins 1, 14, 20 and O2 connector.

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