Yeah looks great I am checking against my harness.
Some concerns to express
1. the heat around mosfet for 5V, could be a problem
2. if I remember correctly the tach output is 12V, it was not working with 5V (memories from 5 years ago)
3. from https://raw.githubusercontent.com/wiki/rusefi/rusefi_documentation/Hardware/pnp_microRusEfi_nb2/hw72nb.pdf
3.1 D21 and D23 should be on pin 37,38
3.2 12_IGN_KEY on 4S - I have to check the hardware, as on my scheme 4S is not connected, same for 3H
2. if I remember correctly the tach output is 12V, it was not working with 5V (memories from 5 years ago)
3.2 12_IGN_KEY on 4S - I have to check the hardware, as on my scheme 4S is not connected, same for 3H
microRusEfi jumper needs to be set to +12v high-side, I believe we feed +12v signal into both tach and alternator
On this board both OEM pressure sensor and external MAP are possible (we made some mistakes on 0.2).
external MAP 5v: pin 4K added into OEM harness, MRE72_0.2 has it
external MAP signal: pin 4U added into OEM harness, MRE72_0.2 has it
external MAP GND: pin 3Z added into OEM harness, MRE_02 work-around: black wire: GND to 3Z
external AFR signal: pin 3L added into OEM harness, MRE_02 work-around: blue wire: top 3L to bottom 2O
MRE_02 work-around - 4H removed
Attachments
NB2_0_2_internal_map.jpg (4.6 MiB) Viewed 15822 times
// by the way NB2 MAF internal diameter is about 2.5 inches / 63mm
// 1K pull-down to read current from this MAF
engineConfiguration->mafAdcChannel = EFI_ADC_6; // PA6 W46 <> W46
1k pull-down is added to the MAF signal pin
At some point @mck1117 was planning to look into OEM ECU schematics but I am not sure what was the outcome.
At some point @mck1117 was planning to look into OEM ECU schematics but I am not sure what was the outcome.
I traced out the OEM ECU, and didn't come up with anything interesting. They just had a 1k pulldown to ground, RC low pass filter, clamp diodes, then a buffer. Exactly the same circuit that we run on all of our ECUs.