# Connector Pinout
insert connector image/pins here
Rear side of PCB
# Pin Descriptions
Each pin has a *Type ID*, which can be used to look up in the following tables what the pin is for, and what functions it can perform.
| Pin Number | Name | Type ID | Default function |
| ----------:|:-------- | ------- |:---------------------------------------------- |
| 1 | **12V** | 12V | 12V supply |
| 2 | **GND** | pgnd | Power GND |
| 3 | **Lowside 2** | ls | Idle solenoid |
| 4 | **ETB+** | etb | ETB+ |
| 5 | **12V** | 12V | 12V supply |
| 6 | **GND** | pgnd | Power GND |
| 7 | **Lowside 1** | ls | VVT |
| 8 | **ETB-** | etb | ETB- |
| 9 | **Ignition 1** | ign | Ignition 1 |
| 10 | **Ignition 2** | ign | Ignition 2 |
| 11 | **Ignition 3** | ign | Ignition 3 |
| 12 | **Ignition 4** | ign | Ignition 4 |
| 13 | **GP out 6** | gp1 | Alternator |
| 14 | **GP out 5** | gp1 | |
| 15 | **USB D-** | usb | USB |
| 16 | **USB D+** | usb | USB |
| 17 | **GND** | sgnd | Signal GND |
| 18 | **AN Temp 1** | at | CLT sensor |
| 19 | **AN Volt 4** | av | |
| 20 | **AN Volt 5** | av | |
| 21 | **GND** | sgnd | Signal GND |
| 22 | **AN Temp 4** | at | |
| 23 | **AN Temp 2** | at | IAT sensor |
| 24 | **AN Temp 3** | at | |
| 25 | **Cam (hall)** | hall | |
| 26 | **AN Volt 2** | av | TPS sensor |
| 27 | **AN Volt 1** | av | MAP sensor |
| 28 | **AN Volt 10** | av | |
| 29 | **Main relay** | mr | Main relay |
| 30 | **AN Volt 7** | av | |
| 31 | **AN Volt 3** | av | |
| 32 | **AN Volt 6** | av | External wideband O2 sensor |
| 33 | **GP out 3** | gp2 | |
| 34 | **GP out 2** | gp2 | Fan relay |
| 35 | **GP out 1** | gp2 | Fuel pump relay |
| 36 | **AN Volt 8** | av | |
| 37 | **Injector 1** | inj | Injector 1 |
| 38 | **Injector 2** | inj | Injector 2 |
| 39 | **5V Sensor 2** | 5v | MAP sensor supply |
| 40 | **AN Volt 9** | av | |
| 41 | **Injector 3** | inj | Injector 3 |
| 42 | **Injector 4** | inj | Injector 4 |
| 43 | **GP out 4** | gp2 | |
| 44 | **5V Sensor 1** | 5v | TPS sensor supply |
| 45 | **VR+/Hall** | vr/hall | Crank VR+/hall |
| 46 | **VR-** | vr | Crank VR- (do not connect if hall) |
| 47 | **CAN low** | can | CAN bus |
| 48 | **CAN high** | can | CAN bus |
# Pin Types
These tables provide technical information about the different types of pin found on microrusEfi.
## Power
| ID | Type | Notes & Limits |
|----|-------------| ---- |
| 12V | Power supply | 9-22V operating, 5A fuse recommended |
| pgnd | Power ground | Solidly ground directly to chassis or engine block. |
| sgnd | Signal ground | Sensor ground. ***Do not ground to engine!***
| 5v | 5V sensor supply | 5V supply for external sensors. 200mA maximum per pin.
## Input
| ID | Type | Notes & Limits | Possible functions |
|------|---------------------| ------------------------------------------------------------------------------------ | --- |
| at | Analog temperature | Analog temperature (thermistor) input. 2.7k/TBD pullup resistor to 5v | Thermistor temperature sensor, fuel level sender (variable resistor type) |
| av | Analog voltage | Analog voltage input. 500k pull down to GND | Analog voltage sensor (MAP, TPS, acc pedal, oil pressure, etc)
| vr | Variable reluctor | VR crank input | VR sensors including crank, cam, vehicle speed
| hall | Hall cam/crank | TBD pull up to 5v hall sensor for cam/crank | Hall sensors including crank, cam, vehicle speed
## Output
| ID | Type | Notes & Limits | Possible functions |
|----|-------------| ---- | --- |
| inj | Injector output | Low side, 2.2A maximum
**Only saturated (high impedance) injectors are supported.** | Injector, general purpose low side |
| ign | Ignition output | 5V push-pull, 250mA maximum | Ignition coil, general purpose 5V push-pull
| ls | High power low side | General purpose low side output, 4.5A maximum | General purpose low side, injector
| gp1 | General purpose push-pull | General purpose push-pull output, 5V/12V (internally selectable) 250mA maximum | General purpose 5V/12V push-pull, ignition coil
| gp2 | General purpose push-pull | General purpose push-pull output, 12V 500mA maximum | General purpose 12V push-pull
| mr | Main relay | Dedicated main relay output. Low side turned on with power, 800mA maximum. | Main relay
| etb | Electronic throttle | Dedicated electronic throttle outputs. Connect a brushed motor
throttle body directly to these two pins.
## Communication
| ID | Type | Notes & Limits |
|----|-------------| ---- |
| usb | USB | USB tuning interface
| can | CAN bus | CAN communication
USB cable green wire: USB D+ DATA+
USB cable white wire: USB D- DATA-
USB cable black wire: ground
USB cable red wire: +5v (optional)
## Hall type Crank sensor
R9=DNP
R15=DNP
R17=2.7K pull-up to 5v
R12=10K
R13=0R
