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Copy file name to clipboardExpand all lines: boards/Dropbear.md
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title: Dropbear
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description:
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published: true
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date: 2024-12-02T03:12:25.231Z
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date: 2024-12-07T22:21:30.211Z
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tags:
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editor: markdown
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dateCreated: 2020-12-24T00:42:27.964Z
@@ -42,7 +42,7 @@ The Dropbear ECU uses 2x 24 pin Delphi Sicma connectors. The connectors are keye
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| A2 | Input | 15A | Power Ground | Connect to battery negative. |
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| A3 | Output | 80mA | Sensor reference | Used for sensors requiring a 5v reference (Eg TPS). **Do not use for powering offboard systems.**|
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| A4 | N/A | N/A | Not used. ||
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| A5 | Input | N/A | Spare Digital In 2| 12v or Ground switching digital input. Can be used for VSS, Idle Up etc. This is also the default input for a secondary Cam input if using dual VVT. MCU pin #22 in TunerStudio |
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| A5 | Input | N/A | Spare Digital In 2| 12v or Ground switching digital input. Can be used for VSS, Idle Up etc. This is also the default input for a secondary Cam input if using dual VVT. <br/> **Dropbear V1:** Pin 22 in TunerStudio <br/> **Dropbear V2:** Pin 34 in TunerStudio |
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| A6 | Both | N/A | CAN L | CAN L connection |
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| A7 | Both | N/A | CAN H | CAN H connection |
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| A8 | Input | 15A | Power Ground | Connect to battery negative. |
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| B3 | Input | N/A | Crank Negative |**Only used with a VR sensor.** Connect to negative side of VR crank sensor. See [Crank/Cam Inputs](#crankcam-inputs) section |
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| B4 | Input | N/A | Cam Primary | Cam sensor (CMP) primary input. Can be 12v, Ground switching or the positive wire of a VR sensor. See [Crank/Cam Inputs](#crankcam-inputs) section |
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| B5 | Input | N/A | Cam Negative |**Only used with a VR sensor.** Connect to negative side of VR cam sensor. See [Crank/Cam Inputs](#crankcam-inputs) section |
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| B6 | Input | N/A | Spare Digital 1| 12v or Ground switching digital input. Can be used for VSS, Idle Up etc. MCU pin #23 in TunerStudio |
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| B6 | Input | N/A | Spare Digital 1| 12v or Ground switching digital input. Can be used for VSS, Idle Up etc. <br/> **Dropbear V1:** Pin 23 in TunerStudio <br/> **Dropbear V2:** Pin 35 in TunerStudio |
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| B7 | Input | N/A | Clutch input. | Ground switching digital input that goes to ground when clutch is engaged. Do not feed 12v on this input |
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| B8 | Input | N/A | Flex sensor | Signal wire from GM/Continental Flex sensor. |
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| C1 | Output | N/A | Analog ground | Ground reference for use by sensors such as TPS, IAT, CLT. **Do not use for powering offboard controllers**|
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| C1 | Output | 2A | Boost | Ground switching output for use with boost control solenoid |
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| C2 | Output | 2A | Fan. | Ground switching output for triggering a fan relay. **Do not drive fan directly from this pin, use only with relay**|
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| C3 | Output | 2A | Spare 2/Stepper-B2 | Can be used either as ground switching output for general purpose use or 12v output if using a stepper idle control (Requires stepper driver to be fitted, see [Stepper Driver](#stepper-driver)). Tuner Studio pin #26|
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| C4 | Output | 2A | Idle/Stepper-B1 | Can be used either as ground switching idle output (For use with PWM valves) or 12v output if using a stepper idle control (Requires stepper driver to be fitted, see [Stepper Driver](#stepper-driver)). Tuner Studio pin #27|
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| C5 | Output | 2A | VVT/Stepper-A1. | Can be used either as ground switching VVT output or 12v output if using a stepper idle control (Requires stepper driver to be fitted, see [Stepper Driver](#stepper-driver))Tuner Studio pin #28|
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| C6 | Output | 2A | Spare 1/Idle 2/Stepper-A2 | Can be used either as ground switching output for general purpose use or 12v output if using a stepper idle control (Requires stepper driver to be fitted, see [Stepper Driver](#stepper-driver)). This is the default pin for Idle 2 when using a 3 wire PWM valve. Tuner Studio pin #29|
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| C4 | Output | 2A | Idle/Stepper-B1 | Can be used either as ground switching idle output (For use with PWM valves) or 12v output if using a stepper idle control (Requires stepper driver to be fitted, see [Stepper Driver](#stepper-driver)). <br/>Tuner Studio pin #27|
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| C5 | Output | 2A | VVT/Stepper-A1. | Can be used either as ground switching VVT output or 12v output if using a stepper idle control (Requires stepper driver to be fitted, see [Stepper Driver](#stepper-driver)). <br/>Tuner Studio pin #28|
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| C6 | Output | 2A | Spare 1/Idle 2/Stepper-A2 | Can be used either as ground switching output for general purpose use or 12v output if using a stepper idle control (Requires stepper driver to be fitted, see [Stepper Driver](#stepper-driver)). This is the default pin for Idle 2 when using a 3 wire PWM valve. <br/>Tuner Studio pin #29|
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| C7 | Output | 1.5A | Fuel Pump | Ground switching output for triggering fuel pump relay. **Do not drive pump directly from this pin, use only with relay**|
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| C8 | Input | 15A | Power Ground | Connect to battery negative. |
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