2021-01-04 17:12:24 -08:00
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Happy Xmas
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2021-02-15 19:06:51 -08:00
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2021-03-22 20:17:41 -07:00
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[hellen72-c-schematic.pdf](Hardware/Hellen/hellen72-c-schematic.pdf)
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2021-03-23 18:51:31 -07:00
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https://rusefi.com/docs/ibom/hellen72-c-ibom.html
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2021-02-15 17:55:17 -08:00
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2021-02-16 19:02:28 -08:00
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[Nightly firmware bundle](https://rusefi.com/build_server/rusefi_bundle_hellen72.zip)
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2021-01-08 12:27:18 -08:00
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2021-03-23 18:51:31 -07:00
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[hellen72b-schematic.pdf](Hardware/Hellen/hellen72b-schematic.pdf)
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2021-01-28 16:43:58 -08:00
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2021-02-17 18:35:34 -08:00
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[Pinout](https://rusefi.com/docs/pinouts/hellen/helen72/)
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2021-01-04 17:12:24 -08:00
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2021-02-17 18:35:34 -08:00
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[Mazda Miata 2003](Mazda-Miata-2003)
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2021-01-28 17:07:11 -08:00
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2021-02-15 19:06:51 -08:00
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# Jumpers
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in order to run a Miata NB text vehicle:
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External MAP vs more ignition channels:
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a) if you are going to use an external MAP, then remove "R5 (IGN5)", "R7 (IGN6)" and "R11 (IGN8)"
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b) or if you NOT using an external MAP, then remove "R6 (GND)" and "R8 (+5V)"
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Warning! The board can be damaged if you skip this step!
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External WBO vs more ignition channels:
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if you want to use an external WBO (AFR) sensor, then remove "R1 (IGN7)"
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Miata vehicle type:
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a) if you have a Miata 2002 (where we measure the battery voltage from 4T=alternator), then remove "R9 (2003)"
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b) or if you have a Miata 2003 (where we measure the battery voltage from 4S=ign.switch), then remove "R10 (2002)"
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2021-04-03 18:45:42 -07:00
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### OEM harness add-ons
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The OEM ECU connector uses AMP Multilock .040 and .070 pins.
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| Board | stm32 pin | |
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|-----|---|---|
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| 4U | MAP| Manifold absolute pressure analog signal from [external sensor](GM-map-sensor) |
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| 4K | +5v | +5v feed for MAP sensor |
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| 3Z | GND | Sensor & USB ground |
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