This page list the outputs that can be used for GenBoard/Manual/DigitalOut configuration and testing.
Injector drivers are primarily used for driving injectors, but any (otherwise) free channel can be configured for any output. The same goes for all the drivers, including ignition and idle solenoid outputs.
Requirements to enter testing mode:
There are two routes to test the outputs of the Vems manually:
- Easiest: Use one of the output test modes available in either Injector/Ignition Outputs Visual or Assign output channels in VemsTune
- Expert: Use a terminal program of your choosing, we recommend "Bray Terminal", after connecting to the system at 19200 baud, 8N1 issue "Man" or TF exit command "$7E$B1$7F$34$7E" (or if uncertain, one after the other) until the system replies with "Hello" to enter manual testing mode. After this issue the "mdh" of your choosing.
For inductive loads; the topmost must be used when available
it must be verified that the chosen driver handles flyback.
- Injector drivers are normally populated with 30V flyback, or active flyback ( see WebShop or GenBoard/Manual/DDFlyback )
- IGBTs (usually used for ignition) have internal clamping that provide an appr. 400V flyback voltage
- stepper channels also have flyback
- P259 have low current capability (recommended for tachout, check engine light, shiftlight, warning light, interfacing logic level signals, logic level relays, max 250mA)
- prefer injector (FET) or ignition driver (IGBT) for any inductive load or relay (including fuel pump relay, except if driven from logiclevel)
- use a series diode when driving a load from p259 which is always powered, even when ECU EC36/25 or the EC36/23 flyback is not (eg main relay comes to mind)
- internal appr. 50V flyback traditionally
- low voltage (SMB diode) flyback since 2015 (v3.8 and v3.8b). This provides added current protection, but a diode might be necessary if the driven load is powered (eg. main relay) even when EC36/23 (injector +supply) is not (to prevent unintentional turnon, or "prelling", see MembersPage/PoweredBMW/MainRelayConnection)
No flyback on
- WBO2 heater1 and 2
- SPECFET 5 and 6 (DRIVE_A and DRIVE_B)
Note: the IDL output is only ment to be used with the ON/OFF type solenoids, driving the relay (max 250mA) that drives the valve. If you want to drive a PWM controlled idle valve directly it's best to use one of the free INJ outputs they can handle much more current (max 10A)
| Family | Number | mdh ON/OFF | same in decimal | Pin | Name | Max Load | Comments |
| SPECFET | 1 | 91/11 | 17 | EC18 pin 18 | Heater 1 | 7 A | Misc driver |
| SPECFET | 2 | A1/21 | 33 | EC18 pin 17 | Heater 2 | 7 A | Misc driver |
| SPECFET | 5 | D1/51 | 81 | EC18 pin 12 | Extra Output 5(Drive A) | 7 A | Misc driver |
| SPECFET | 6 | E1/61 | 97 | EC18 pin 6 | Extra Output 6(Drive B) | 7 A | Misc driver |
| I259 | 0 | 82/02 | 2 | EC36 pin 35 | Drive 00 | 7 A | Ignition Driver |
| I259 | 1 | 92/12 | 18 | EC36 pin 33 | Drive 01 | 7 A | Ignition Driver |
| I259 | 2 | A2/22 | 34 | EC36 pin 34 | Drive 02 | 7 A | Ignition Driver |
| I259 | 3 | B2/32 | 50 | EC36 pin 36 | Drive 03 | 7 A | Ignition Driver |
| I259 | 4 | C2/42 | 66 | EC36 pin 11 | Drive 04 | 7 A | Ignition Driver |
| I259 | 5 | D2/52 | 82 | EC36 pin 12 | Drive 05 | 7 A | Ignition Driver |
| I259 | 6 | E2/62 | 98 | EC36 pin 24 | Drive 06 | 7 A | Ignition Driver |
| I259 | 7 | F2/72 | 114 | EC36 pin 10 | Drive 07 | 7 A | Ignition Driver |
| S259 | 0 | 86/06 | 6 | N/A | lcd_rs | N/A | Used internally |
| S259 | 1 | 96/16 | 22 | (Onboard) | S259 Out1(Extra output 5) | logic | Has to be soldered |
| S259 | 2 | A6/26 | 38 | (Onboard) | S259 Out2(Extra output 6) | logic | Check board layout |
| S259 | 3 | B6/36 | 54 | EC18 pin 4 | Step A | 0.6A | Can be used for stepper |
| S259 | 4 | C6/46 | 70 | EC18 pin 10 | Step B | 0.6A | Or as separate drivers with |
| S259 | 5 | D6/56 | 86 | EC18 pin 5 | Step C | 0.6A | stepper chip populated |
| S259 | 6 | E6/66 | 102 | EC18 pin 11 | Step D | 0.6A | otherwise, internal logic level |
| S259 | 7 | F6/76 | 118 | N/A | EN_ab | N/A | used internally |
| P259 | 0 | 87/07 | 7 | EC36 pin 4 | Drive 08 | 250mA | Free. Often tach-out |
| P259 | 1 | 97/17 | 23 | EC36 pin 16 | Drive 09 | 250mA | Free for any usage |
| P259 | 2 | A7/27 | 39 | (Onboard) | CL LED | 250mA | Onboard LED1 or bridgeoutput PFET |
| P259 | 3 | B7/37 | 55 | (Onboard) | MISC LED | 250mA | Onboard LED2 or bridgeoutput PFET |
| P259 | 4 | C7/47 | 71 | EC36 pin 3 | IDL | 250mA | Idle solenoid relay |
| P259 | 5 | D7/57 | 87 | EC36 pin 15 | FP | 250mA | Fuel pump relay |
| P259 | 6 | E7/67 | 103 | EC36 pin 31 | Drive 10 | 250mA | Free for any usage |
| P259 | 7 | F7/77 | 119 | EC36 pin 30 | Drive 11 | 250mA | Free for any usage |
Notes:
- P259/4-5-6-7 (bold) can be "Hi-side PFETs"=4 if ordered with that option, and "ETC bridgeoutput interface"=0
- when using mdh.. command for testing (take care what is connected, eg. a coil will fry) add hexa 80 to turn the signal on: eg. mdhf2 turns I259/7 (that is the gate-signal for the IGBT that drives Drive07) on, while mdh72 turns it off.
- when adding hexa 80 in configuration, the signal will be inverted.
- The decimal value is only used in Megatune
Summary for mdh.. testing
Above you've seen examples for ("." = hexadecimal character from 0..f)
- mdh.1 extraFETs (usually not used, since those EC18 pins are used for analog or trigger inputs by default )
- mdh.2 ign outputs
- mdh.6 stepper outputs
- mdh.7 p259 outputs
- mdhff (channel disable => no output is actuated)
but the most interesting and flexible
- mdh.0 h[0] table => inj outputs
Mapping guideline - how to map outputs to functions
- injectors => injector outputs
- ignition => ignition outputs (logiclevel for active coils; IGBT based power outputs for passive coils)
- bipolar stepper (if used) => stepper outputs
- other outputs => after assigning the above use the remaining outputs. take care about current rating and flyback protection (eg. WBO2 second channel FET and DPAK "extraFET"-s have no flyback installed by default!)
- Use the higher current stuff first for more safety
- except for (low current like) LEDs (like shiftlight), where p259 outputs are the best
- don't forget flyback and GND and GND5 connections
Several injector outputs can be switched simultaneously - mdh.0
This is a very nice and often useful feature.
There is no direct connection between an mdh.0 command (replace '.' with 0..9,a..f) and injector FET. Only the h[0] table-line makes the connection. This very important. Don't fool yourself by forgetting this.
Let's assume (just for the example) that tables.txt has:\nÿ1ÿ
It is very important to note the difference compared to other outputs.
While configuring ...channel=47 means the P259 output 4 (labelled idle solenoid relay, EC36 pin 3) is used (which is direct mapping), configuring 70 will not necessarily mean INJ H (because of the indirect "lookup").
- ..._channel=70
- ..._channel=f0 (same channels used as for =70, but inverted output)
- mdh70 (HW testing: turn off )
- mdhf0 (HW testing: turn on )
- mdh10 and mdh90 will turn nothing OFF/ON because 00 at index 1 (remember it is 0 based?) means nothing is selected.
- mdh00 and mdh80 will turn OFF/ON injector channels behind mask A2, that is 80 + 20 + 02, that is INJ H and INJ F and INJ B
- mdh50 and mdhd0 turns OFF/ON all injector channels, since mask FF means 80 + 40 + 20 + 10 + 08 + 04 + 02 + 01 that includes all injector channels.
| Family | Number | h[0] mask | Pin | Name | Max Load | Comments |
| INJFET | 0 | 01/1 | EC36 pin 7 | Inj A | 10 A | Injector driver |
| INJFET | 1 | 02/2 | EC36 pin 19 | Inj B | 10 A | Injector driver |
| INJFET | 2 | 04/4 | EC36 pin 8 | Inj C | 10 A | Injector driver |
| INJFET | 3 | 08/8 | EC36 pin 20 | Inj D | 10 A | Injector driver |
| INJFET | 4 | 10/16 | EC36 pin 9 | Inj E | 10 A | Injector driver |
| INJFET | 5 | 20/32 | EC36 pin 18 | Inj F | 10 A | Injector driver |
| INJFET | 6 | 40/64 | EC36 pin 6 | Inj G | 10 A | Injector driver |
| INJFET | 7 | 80/128 | EC36 pin 17 | Inj H | 10 A | Injector driver |
h[0] mask is written in hex / decimal, as megatune wants the injector output table in decimal values.
In general it doesn't make sense to control the same injector channel from several h[0] elements (countrary to the above made-up example). Also, it doesn't make sense to assign the same output for different config..._channel. The result will be undefined (and hard to track down). Assign config..._channel=FF for unused functions, that means "disable".
See also