Haltech Nexus R5 pinout
ecurecovery.com/pinouts/haltech/nexus-r5 · Every pin checked against 2 Haltech documents · data checked 2026-11-01
Pinout
Haltech Nexus R5 pinout
Every pin of the 34-pin A and 26-pin B connectors, with the wire colours of Haltech's harness. Tap a pin to see what it does.
Every pin checked against 2 Haltech documentsPick any pin on the drawing or in the table to see its function, its wire colour and the documents it was checked in.
Haltech Nexus R5 connector A pinout (34-pin)
| Pin | Function | Wire |
|---|---|---|
| A1 | Injector 1 | LBlue |
| A2 | Injector 2 | L/BBlue with black stripe |
| A3 | Injector 3 | L/BRBlue with brown stripe |
| A4 | Injector 4 | L/RBlue with red stripe |
| A5 | Injector 5 | L/OBlue with orange stripe |
| A6 | Injector 6 | L/YBlue with yellow stripe |
| A7 | Injector 7 | L/GBlue with green stripe |
| A8 | Injector 8 | L/VBlue with violet stripe |
| A9 | DPO 1 | V/BViolet with black stripe |
| A10 | Battery Ground Output | BBlack |
| A11 | Battery Ground Output | BBlack |
| A12 | DPO 2 | V/BRViolet with brown stripe |
| A13 | Ignition Switch Input | PPink |
| A14 | DPO 3 | V/RViolet with red stripe |
| A15 | DPO 4 | V/OViolet with orange stripe |
| A16 | DPO 5 | V/YViolet with yellow stripe |
| A17 | DPO 6 | V/GViolet with green stripe |
| A18 | DPO 7 | B/YBlack with yellow stripe |
| A19 | HBO 1 | BR/BBrown with black stripe |
| A20 | HBO 2 | BR/RBrown with red stripe |
| A21 | HBO 3 | BR/GBrown with green stripe |
| A22 | HBO 4 | BR/PBrown with pink stripe |
| A23 | CAN 1 H | WWhite |
| A24 | CAN 1 L | LBlue |
| A25 | DPO 8 | VViolet |
| A26 | +12V Low Current Output | R/LRed with blue stripe |
| A27 | Ignition 1 | Y/BYellow with black stripe |
| A28 | Ignition 2 | Y/RYellow with red stripe |
| A29 | Ignition 3 | Y/OYellow with orange stripe |
| A30 | Ignition 4 | Y/GYellow with green stripe |
| A31 | Ignition 5 | Y/BRYellow with brown stripe |
| A32 | Ignition 6 | Y/LYellow with blue stripe |
| A33 | Ignition 7 | Y/VYellow with violet stripe |
| A34 | Ignition 8 | Y/GYYellow with grey stripe |
Haltech Nexus R5 connector B pinout (26-pin)
| Pin | Function | Wire |
|---|---|---|
| B1 | Injector 9 | LLLight blue |
| B2 | Injector 10 | LL/BLight blue with black stripe |
| B3 | Injector 11 | LL/BRLight blue with brown stripe |
| B4 | Injector 12 | LL/RLight blue with red stripe |
| B5 | Injector 13 | LL/OLight blue with orange stripe |
| B6 | Injector 14 | LL/YLight blue with yellow stripe |
| B7 | Injector 15 | LL/GLight blue with green stripe |
| B8 | Injector 16 | LL/VLight blue with violet stripe |
| B9 | SPI 7 | GY/GGrey with green stripe |
| B10 | SPI 8 | GY/VGrey with violet stripe |
| B11 | SPI 9 | GY/LGrey with blue stripe |
| B12 | SPI 10 | GY/WGrey with white stripe |
| B13 | CAN 3 H | WWhite |
| B14 | Injector 17 | LL/GYLight blue with grey stripe |
| B15 | Ignition 9 | LY/BLight yellow with black stripe |
| B16 | Ignition 10 | LY/RLight yellow with red stripe |
| B17 | Ignition 11 | LY/OLight yellow with orange stripe |
| B18 | Ignition 12 | LY/GLight yellow with green stripe |
| B19 | CAN 3 L | LBlue |
| B20 | Injector 18 | LL/LLight blue with blue stripe |
| B21 | Wideband 2 : Heater + | GYGrey |
| B22 | Wideband 2 : Input | YYellow |
| B23 | Wideband 2 : Pump | RRed |
| B24 | Wideband 2 : Nernst | BBlack |
| B25 | Wideband 2 : Heater- | WWhite |
| B26 | Wideband 2 : Cal | GGreen |
Haltech Nexus R5 connector C pinout (34-pin)
| Pin | Function | Wire |
|---|---|---|
| C1 | Trigger + | YYellow |
| C2 | Trigger - | GGreen |
| C3 | Home + | YYellow |
| C4 | Home - | GGreen |
| C5 | SPI 1 | GY/BRGrey with brown stripe |
| C6 | SPI 2 | GY/RGrey with red stripe |
| C7 | SPI 3 | GY/OGrey with orange stripe |
| C8 | SPI 4 | GY/YGrey with yellow stripe |
| C9 | 8V sensor power | O/WOrange with white stripe |
| C10 | AVI 1 | WWhite |
| C11 | AVI 2 | W/YWhite with yellow stripe |
| C12 | AVI 3 | W/GYWhite with grey stripe |
| C13 | AVI 4 | W/VWhite with violet stripe |
| C14 | AVI 5 | W/GWhite with green stripe |
| C15 | AVI 6 | W/OWhite with orange stripe |
| C16 | AVI 7 | W/BWhite with black stripe |
| C17 | AVI 8 | W/BRWhite with brown stripe |
| C18 | AVI 9 | W/RWhite with red stripe |
| C19 | SPI 5 | GY/PGrey with pink stripe |
| C20 | SPI 6 | GY/LGGrey with light green stripe |
| C21 | CAN 2 H | WWhite |
| C22 | CAN 2 L | LBlue |
| C23 | Knock 1 | WWhite |
| C24 | Knock 2 | WWhite |
| C25 | 5V sensor power A | OOrange |
| C26 | Signal ground A | B/WBlack with white stripe |
| C27 | AVI 10 | LGLight green |
| C28 | AVI 11 | LG/BLight green with black stripe |
| C29 | Wideband 1 : Heater + | GYGrey |
| C30 | Wideband 1 : Input | YYellow |
| C31 | Wideband 1 : Pump | RRed |
| C32 | Wideband 1 : Nernst | BBlack |
| C33 | Wideband 1 : Heater - | WWhite |
| C34 | Wideband 1 : Cal | GGreen |
Haltech Nexus R5 connector D pinout (26-pin)
| Pin | Function | Wire |
|---|---|---|
| D1 | 8A HCO 1 | P/RPink with red stripe |
| D2 | 8A HCO 2 | P/BRPink with brown stripe |
| D3 | 8A HCO 3 | P/BPink with black stripe |
| D4 | 8A HCO 4 | P/OPink with orange stripe |
| D5 | 8A HCO 5 | P/YPink with yellow stripe |
| D6 | 8A HCO 6 | P/GPink with green stripe |
| D7 | 8A HCO 7 | P/VPink with violet stripe |
| D8 | 8A HCO 8 | P/LPink with blue stripe |
| D9 | Signal ground B | B/GYBlack with grey stripe |
| D10 | AVI 12 | LG/BRLight green with brown stripe |
| D11 | AVI 13 | LG/RLight green with red stripe |
| D12 | AVI 14 | LG/OLight green with orange stripe |
| D13 | 8A HCO 9 | P/GYPink with grey stripe |
| D14 | 8A HCO 10 | P/WPink with white stripe |
| D15 | 5V sensor power B | O/ROrange with red stripe |
| D16 | AVI 15 | LG/YLight green with yellow stripe |
| D17 | AVI 16 | LG/GLight green with green stripe |
| D18 | AVI 17 | LG/VLight green with violet stripe |
| D19 | 8A HCO 11 | P/LGPink with light green stripe |
| D20 | 8A HCO 12 | P/LLPink with light blue stripe |
| D21 | AVI 18 | G/BGreen with black stripe |
| D22 | AVI 19 | G/BRGreen with brown stripe |
| D23 | AVI 20 | G/RGreen with red stripe |
| D24 | AVI 21 | G/OGreen with orange stripe |
| D25 | AVI 22 | G/YGreen with yellow stripe |
| D26 | AVI 23 | G/VGreen with violet stripe |
Haltech Nexus R5 connector E pinout (4-pin)
| Pin | Function | Wire |
|---|---|---|
| E1 | 25A HCO 1 | R/LRed with blue stripe |
| E2 | 25A HCO 2 | R/YRed with yellow stripe |
| E3 | 25A HCO 3 | R/ORed with orange stripe |
| E4 | 25A HCO 4 | R/GRed with green stripe |
Haltech Nexus R5 pins at a glance
- Which pins are CAN on the Haltech Nexus R5?
- CAN 1 H: pin A23 (White, W). CAN 1 L: pin A24 (Blue, L). CAN 3 H: pin B13 (White, W). CAN 3 L: pin B19 (Blue, L). CAN 2 H: pin C21 (White, W). CAN 2 L: pin C22 (Blue, L).
- Which pins are the crank and cam inputs on the Haltech Nexus R5?
- Trigger +: pin C1 (Yellow, Y). Trigger -: pin C2 (Green, G). Home +: pin C3 (Yellow, Y). Home -: pin C4 (Green, G).
- Which pins are the injector outputs on the Haltech Nexus R5?
- Injector 1: pin A1 (Blue, L). Injector 2: pin A2 (Blue with black stripe, L/B). Injector 3: pin A3 (Blue with brown stripe, L/BR). Injector 4: pin A4 (Blue with red stripe, L/R). Injector 5: pin A5 (Blue with orange stripe, L/O). Injector 6: pin A6 (Blue with yellow stripe, L/Y). Injector 7: pin A7 (Blue with green stripe, L/G). Injector 8: pin A8 (Blue with violet stripe, L/V). Injector 9: pin B1 (Light blue, LL). Injector 10: pin B2 (Light blue with black stripe, LL/B). Injector 11: pin B3 (Light blue with brown stripe, LL/BR). Injector 12: pin B4 (Light blue with red stripe, LL/R). Injector 13: pin B5 (Light blue with orange stripe, LL/O). Injector 14: pin B6 (Light blue with yellow stripe, LL/Y). Injector 15: pin B7 (Light blue with green stripe, LL/G). Injector 16: pin B8 (Light blue with violet stripe, LL/V). Injector 17: pin B14 (Light blue with grey stripe, LL/GY). Injector 18: pin B20 (Light blue with blue stripe, LL/L).
- Which pins are the ignition outputs on the Haltech Nexus R5?
- Ignition 1: pin A27 (Yellow with black stripe, Y/B). Ignition 2: pin A28 (Yellow with red stripe, Y/R). Ignition 3: pin A29 (Yellow with orange stripe, Y/O). Ignition 4: pin A30 (Yellow with green stripe, Y/G). Ignition 5: pin A31 (Yellow with brown stripe, Y/BR). Ignition 6: pin A32 (Yellow with blue stripe, Y/L). Ignition 7: pin A33 (Yellow with violet stripe, Y/V). Ignition 8: pin A34 (Yellow with grey stripe, Y/GY). Ignition 9: pin B15 (Light yellow with black stripe, LY/B). Ignition 10: pin B16 (Light yellow with red stripe, LY/R). Ignition 11: pin B17 (Light yellow with orange stripe, LY/O). Ignition 12: pin B18 (Light yellow with green stripe, LY/G).
- Which pins are ground on the Haltech Nexus R5?
- Battery Ground Output: pins A10, A11 (Black, B). Signal ground A: pin C26 (Black with white stripe, B/W). Signal ground B: pin D9 (Black with grey stripe, B/GY).
- Which pins power the Haltech Nexus R5?
- Ignition Switch Input: pin A13 (Pink, P).
- Which pins are the sensor supplies on the Haltech Nexus R5?
- 8V sensor power: pin C9 (Orange with white stripe, O/W). 5V sensor power A: pin C25 (Orange, O). 5V sensor power B: pin D15 (Orange with red stripe, O/R).
- Which pins are the wideband sensor connections on the Haltech Nexus R5?
- Wideband 2 : Heater +: pin B21 (Grey, GY). Wideband 2 : Input: pin B22 (Yellow, Y). Wideband 2 : Pump: pin B23 (Red, R). Wideband 2 : Nernst: pin B24 (Black, B). Wideband 2 : Heater-: pin B25 (White, W). Wideband 2 : Cal: pin B26 (Green, G). Wideband 1 : Heater +: pin C29 (Grey, GY). Wideband 1 : Input: pin C30 (Yellow, Y). Wideband 1 : Pump: pin C31 (Red, R). Wideband 1 : Nernst: pin C32 (Black, B). Wideband 1 : Heater -: pin C33 (White, W). Wideband 1 : Cal: pin C34 (Green, G).
Haltech Nexus R5 pinout sheet
A printable sheet with the connector drawings and every pin, made from the checked data on this page.
Where this comes from
Only Haltech's own documents. Pin names and notes are written exactly as Haltech writes them.
Haltech harness quick start guide
Haltech wiring diagram
Haltech wire colour codes
- B = Black
- BR = Brown
- G = Green
- GY = Grey
- L = Blue
- O = Orange
- P = Pink
- R = Red
- V = Violet
- Y = Yellow
- W = White
- LL = Light blue
- LG = Light green
- LY = Light yellow
Two letters: the first is the wire colour, the second is the stripe.
How we checked it
- We start from Haltech's pinout table for this ECU.
- We read every pin again from a second Haltech document, the wiring diagram or the quick start guide. A script compares the two, pin by pin.
- A pin is only shown when its function and its wire colour match in both. Where a diagram has no text to read, we read the pins off the drawing itself.
- The notes are Haltech's own words from its pinout table.
ECU Recovery is not affiliated with Haltech. Haltech and Elite are trademarks of Haltech. If your harness came with its own diagram, check your wiring against it.
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