VW Golf/Jetta Mk2 1.8 8v Digifant II → MaxxECU MaxxECU STREET REV9+ (auto)
VW Golf/Jetta Mk2 1.8 8v Digifant II — MaxxECU — MaxxECU STREET
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-12
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
| Status | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 1: read the Findings page before cutting any wire |
| Size of the job | 24 wires · 6 connectors · 0 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-A-14 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | MAXXECUSTREE-C1-M4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-A-13 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-19 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-GND-1 | MAXXECUSTREE-C1-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-5 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-6 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-0V-1 | MAXXECUSTREE-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | MAXXECUSTREE-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-17 | MAXXECUSTREE-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-18 | MAXXECUSTREE-C1-H4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-25 | MAXXECUSTREE-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-12 | MAXXECUSTREE-C1-K1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-A-7 | SP-SHD-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-SHD-1 | MAXXECUSTREE-C1-E3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-A-3 | MAXXECUSTREE-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-21 | MAXXECUSTREE-C1-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-10 | MAXXECUSTREE-C1-F1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-A-22 | MAXXECUSTREE-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-23 | MAXXECUSTREE-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-2 | MAXXECUSTREE-C1-J4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-9 | MAXXECUSTREE-C1-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-1 | MAXXECUSTREE-C1-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-11 | MAXXECUSTREE-C1-K4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
Bench test (before first power-up)
Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).
| # | Probe A | Probe B | Expect | Why | Reading |
|---|---|---|---|---|---|
| 1 | MAXXECUSTREE-C1-G1 | MAXXECUSTREE-C1-H1 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 2 | MAXXECUSTREE-C1-M4 | MAXXECUSTREE-C1-H1 | open (OL) | +12 V supply must not touch sensor ground | |
| 3 | MAXXECUSTREE-C1-L4 | MAXXECUSTREE-C1-G1 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | MAXXECUSTREE-C1-L4 | MAXXECUSTREE-C1-M4 | open (OL) | power ground must not touch +12 V supply | |
| 5 | MAXXECUSTREE-C1-M4 | MAXXECUSTREE-C1-G1 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MAXXECUSTREE-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A2 | IGN 1 | — | W12 | — | 0.5 | OEM-A-25 | — | — | — |
| A3 | IGN 2 | — | — | — | — | — | — | — | — |
| A4 | GPO 8/TACHO | — | — | — | — | — | — | — | — |
| B2 | IGN 3 | — | — | — | — | — | — | — | — |
| B3 | IGN 4 | — | — | — | — | — | — | — | — |
| B4 | GPO 1 | — | W16 | — | 0.5 | OEM-A-3 | — | — | — |
| C2 | IGN 5 | — | — | — | — | — | — | — | — |
| C3 | IGN 6 | — | — | — | — | — | — | — | — |
| C4 | GPO 2 | — | W19 | — | 0.5 | OEM-A-22 | — | — | — |
| D1 | WBO2 Heater- | — | — | — | — | — | — | — | — |
| D4 | GPO 3 | — | W20 | — | 0.5 | OEM-A-23 | — | — | — |
| E1 | CAN H | — | — | — | — | — | — | — | — |
| E2 | CAN L | — | — | — | — | — | — | — | — |
| E3 | GND Shield | — | W15 | — | 0.5 | SP-SHD-1 | — | — | — |
| F1 | CLT | — | W18 | — | 0.5 | OEM-A-10 | — | — | — |
| F2 | IAT | — | W22 | — | 0.5 | OEM-A-9 | — | — | — |
| F3 | WBO2 VREF | — | — | — | — | — | — | — | — |
| F4 | WBO2 VS | — | — | — | — | — | — | — | — |
| G1 | +5V sensor supply | — | W10 | — | 0.5 | OEM-A-17 | — | — | — |
| G2 | TPS/AIN | — | — | — | — | — | — | — | — |
| G3 | WBO2 IP | — | — | — | — | — | — | — | — |
| G4 | WBO2 RCAL | — | — | — | — | — | — | — | — |
| H1 | Sensor GND | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| H2 | Trigger GND | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| H3 | TRIGGER | — | — | — | — | — | — | — | — |
| H4 | HOME | — | W11 | — | 0.5 | OEM-A-18 | — | — | — |
| J1 | AIN 1 (temperature) | — | — | — | — | — | — | — | — |
| J2 | AIN 2 (Temperature) | — | — | — | — | — | — | — | — |
| J3 | AIN 3 (0-5V) | — | W17 | — | 0.5 | OEM-A-21 | — | — | — |
| J4 | AIN 4 (0-5V) | — | W21 | — | 0.5 | OEM-A-2 | — | — | — |
| K1 | INJ 1 | — | W13 | — | 0.5 | OEM-A-12 | — | — | — |
| K2 | INJ 2 | — | — | — | — | — | — | — | — |
| K3 | DIN 1 | — | W23 | — | 0.5 | OEM-A-1 | — | — | — |
| K4 | DIN 2 | — | W24 | — | 0.5 | OEM-A-11 | — | — | — |
| L3 | INJ 6 | — | — | — | — | — | — | — | — |
| L4 | Engine GND | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| M1 | INJ 3 | — | — | — | — | — | — | — | — |
| M2 | INJ 4 | — | — | — | — | — | — | — | — |
| M3 | INJ 5 | — | — | — | — | — | — | — | — |
| M4 | +12V ECU power supply | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Starter signal (term 50) | — | W23 | — | 0.5 | MAXXECUSTREE-C1-K3 | — | — | — |
| 10 | Coolant temperature sensor | — | W18 | — | 0.5 | MAXXECUSTREE-C1-F1 | — | — | — |
| 11 | Idle/WOT throttle switch | — | W24 | — | 0.5 | MAXXECUSTREE-C1-K4 | — | — | — |
| 12 | Injector driver (batch, all 4) | — | W13 | — | 0.5 | MAXXECUSTREE-C1-K1 | — | — | — |
| 13 | Ground | — | W3 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | ECU power (control-unit relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 16 | A/C compressor signal | — | — | — | — | — | — | — | — |
| 17 | AFM potentiometer supply | — | W10 | — | 0.5 | MAXXECUSTREE-C1-G1 | — | — | — |
| 18 | Hall sender signal (engine speed) | — | W11 | — | 0.5 | MAXXECUSTREE-C1-H4 | — | — | — |
| 19 | Ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Oxygen (lambda) sensor signal | — | W21 | — | 0.5 | MAXXECUSTREE-C1-J4 | — | — | — |
| 21 | AFM signal | — | W17 | — | 0.5 | MAXXECUSTREE-C1-J3 | — | — | — |
| 22 | Idle stabilizer valve coil 1 | — | W19 | — | 0.5 | MAXXECUSTREE-C1-C4 | — | — | — |
| 23 | Idle stabilizer valve coil 2 | — | W20 | — | 0.5 | MAXXECUSTREE-C1-D4 | — | — | — |
| 25 | Ignition timing signal to TCI | — | W12 | — | 0.5 | MAXXECUSTREE-C1-A2 | — | — | — |
| 3 | Fuel pump relay control | — | W16 | — | 0.5 | MAXXECUSTREE-C1-B4 | — | — | — |
| 4 | Knock sensor signal | — | — | — | — | — | — | — | — |
| 5 | Knock sensor return | — | W6 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sensor ground (CTS/Hall/AFM/throttle) | — | W7 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Knock sensor shield | — | W14 | — | 0.5 | SP-SHD-1 | — | — | — |
| 8 | Hall sender supply (distributor) | — | — | — | — | — | — | — | — |
| 9 | Intake air temperature sensor | — | W22 | — | 0.5 | MAXXECUSTREE-C1-F2 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W6 | — | 0.5 | OEM-A-5 | — | — | — |
| 1 | — | — | W7 | — | 0.5 | OEM-A-6 | — | — | — |
| 1 | — | — | W8 | — | 0.5 | MAXXECUSTREE-C1-H1 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | MAXXECUSTREE-C1-H2 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-14 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MAXXECUSTREE-C1-M4 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W3 | — | 0.85 | OEM-A-13 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | OEM-A-19 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | MAXXECUSTREE-C1-L4 | — | — | — |
SP-SHD
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W14 | — | 0.5 | OEM-A-7 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | MAXXECUSTREE-C1-E3 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Starter signal (term 50) | digital_in | MAXXECUSTREE-C1-K3 | DIN 1 | digital_in | corroborated | |
| OEM-A-10 | Coolant temperature sensor | temp_in | MAXXECUSTREE-C1-F1 | CLT | temp_in | corroborated | |
| OEM-A-11 | Idle/WOT throttle switch | digital_in | MAXXECUSTREE-C1-K4 | DIN 2 | digital_in | corroborated | |
| OEM-A-12 | Injector driver (batch, all 4) | injector_out | MAXXECUSTREE-C1-K1 | INJ 1 | injector_out | corroborated | |
| OEM-A-13 | Ground | ground | MAXXECUSTREE-C1-L4 | Engine GND | ground | corroborated | |
| OEM-A-14 | ECU power (control-unit relay) | power_in | MAXXECUSTREE-C1-M4 | +12V ECU power supply | power_in | corroborated | |
| OEM-A-16 | A/C compressor signal | digital_in | — | — | — | corroborated | |
| OEM-A-17 | AFM potentiometer supply | vref | MAXXECUSTREE-C1-G1 | +5V sensor supply | vref | corroborated | |
| OEM-A-18 | Hall sender signal (engine speed) | trigger_in | MAXXECUSTREE-C1-H4 | HOME | trigger_in | corroborated | |
| OEM-A-19 | Ground | ground | MAXXECUSTREE-C1-L4 | Engine GND | ground | corroborated | |
| OEM-A-2 | Oxygen (lambda) sensor signal | lambda_nb_in | MAXXECUSTREE-C1-J4 | AIN 4 (0-5V) | analog_in | corroborated | |
| OEM-A-21 | AFM signal | analog_in | MAXXECUSTREE-C1-J3 | AIN 3 (0-5V) | analog_in | corroborated | |
| OEM-A-22 | Idle stabilizer valve coil 1 | low_side_out | MAXXECUSTREE-C1-C4 | GPO 2 | low_side_out | corroborated | |
| OEM-A-23 | Idle stabilizer valve coil 2 | low_side_out | MAXXECUSTREE-C1-D4 | GPO 3 | low_side_out | corroborated | |
| OEM-A-25 | Ignition timing signal to TCI | ignition_out | MAXXECUSTREE-C1-A2 | IGN 1 | ignition_out | corroborated | |
| OEM-A-3 | Fuel pump relay control | low_side_out | MAXXECUSTREE-C1-B4 | GPO 1 | low_side_out | corroborated | |
| OEM-A-4 | Knock sensor signal | knock_in | — | — | — | corroborated | |
| OEM-A-5 | Knock sensor return | sensor_ground | MAXXECUSTREE-C1-H1 + MAXXECUSTREE-C1-H2 | Sensor GND + Trigger GND | sensor_ground | corroborated | |
| OEM-A-6 | Sensor ground (CTS/Hall/AFM/throttle) | sensor_ground | MAXXECUSTREE-C1-H1 + MAXXECUSTREE-C1-H2 | Sensor GND + Trigger GND | sensor_ground | corroborated | |
| OEM-A-7 | Knock sensor shield | shield | MAXXECUSTREE-C1-E3 | GND Shield | shield | corroborated | |
| OEM-A-8 | Hall sender supply (distributor) | power_in | — | — | — | corroborated | |
| OEM-A-9 | Intake air temperature sensor | temp_in | MAXXECUSTREE-C1-F2 | IAT | temp_in | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-14 | SP-14V-1 | 0.85 | no route | ECU power (control-unit relay) | — | |
| W2 | SP-14V-1 | MAXXECUSTREE-C1-M4 | 0.85 | no route | +12V ECU power supply | — | |
| W3 | OEM-A-13 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W4 | OEM-A-19 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W5 | SP-GND-1 | MAXXECUSTREE-C1-L4 | 0.85 | no route | Engine GND | — | |
| W6 | OEM-A-5 | SP-0V-1 | 0.5 | no route | Knock sensor return | — | |
| W7 | OEM-A-6 | SP-0V-1 | 0.5 | no route | Sensor ground (CTS/Hall/AFM/throttle) | — | |
| W8 | SP-0V-1 | MAXXECUSTREE-C1-H1 | 0.5 | no route | Sensor GND | — | |
| W9 | SP-0V-1 | MAXXECUSTREE-C1-H2 | 0.5 | no route | Trigger GND | — | |
| W10 | OEM-A-17 | MAXXECUSTREE-C1-G1 | 0.5 | no route | AFM potentiometer supply | — | |
| W11 | OEM-A-18 | MAXXECUSTREE-C1-H4 | 0.5 | no route | Hall sender signal (engine speed) | — | |
| W12 | OEM-A-25 | MAXXECUSTREE-C1-A2 | 0.5 | no route | Ignition timing signal to TCI | — | |
| W13 | OEM-A-12 | MAXXECUSTREE-C1-K1 | 0.5 | no route | Injector driver (batch, all 4) | — | |
| W14 | OEM-A-7 | SP-SHD-1 | 0.5 | no route | Knock sensor shield | — | |
| W15 | SP-SHD-1 | MAXXECUSTREE-C1-E3 | 0.5 | no route | GND Shield | — | |
| W16 | OEM-A-3 | MAXXECUSTREE-C1-B4 | 0.5 | no route | Fuel pump relay control | — | |
| W17 | OEM-A-21 | MAXXECUSTREE-C1-J3 | 0.5 | no route | AFM signal | — | |
| W18 | OEM-A-10 | MAXXECUSTREE-C1-F1 | 0.5 | no route | Coolant temperature sensor | — | |
| W19 | OEM-A-22 | MAXXECUSTREE-C1-C4 | 0.5 | no route | Idle stabilizer valve coil 1 | — | |
| W20 | OEM-A-23 | MAXXECUSTREE-C1-D4 | 0.5 | no route | Idle stabilizer valve coil 2 | — | |
| W21 | OEM-A-2 | MAXXECUSTREE-C1-J4 | 0.5 | no route | Oxygen (lambda) sensor signal | — | |
| W22 | OEM-A-9 | MAXXECUSTREE-C1-F2 | 0.5 | no route | Intake air temperature sensor | — | |
| W23 | OEM-A-1 | MAXXECUSTREE-C1-K3 | 0.5 | no route | Starter signal (term 50) | — | |
| W24 | OEM-A-11 | MAXXECUSTREE-C1-K4 | 0.5 | no route | Idle/WOT throttle switch | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (3)
| Severity | Code | Subject | Message |
|---|---|---|---|
| error | REQUIRED_UNMAPPED | OEM-A-8 | Required OEM function "Hall sender supply (distributor)" (power_in) is not connected to the new ECU. |
| warn | LOAD_UNKNOWN | MAXXECUSTREE-C1-B4 | MAXXECUSTREE-C1-B4 "GPO 1" drives OEM-A-3 Fuel pump relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| info | UNMAPPED | OEM | 2 optional OEM pins are not mapped: OEM-A-16 A/C compressor signal; OEM-A-4 Knock sensor signal |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Fit check: unconfirmed. Confirm these before building: - Trigger pattern for VW Digifant not found in the ECU's docs (No OEM-named Digifant pattern; distributor via generic "Distributor" mode only.) - No knock input; the stock knock sensor would be unused Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-A 8: Hall sender supply (distributor): no rule for class sensor_supply_in; wire by hand Not wired: - OEM-A 4: Knock sensor signal: no free knock input on MaxxECU MaxxECU STREET - OEM-A 16: A/C compressor signal: no free switch_in/frequency_in/analog_0_5 on MaxxECU MaxxECU STREET
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | MaxxECU GEN1 pinout (MINI / STREET / SPORT / V1 / RACE / PRO) | http://www.maxxecu.com/webhelp/wirings-maxxecu_pinout.html | archive | 2026-10-05 | 2e37b6814690 |
| 2 | community_copy | a2resource: Digifant II engine controller pinout (VW Golf/Jetta Mk2 1.8 8v) | http://www.a2resource.com/electrical/management/digifant2.html | — | — | — |
| 2 | community_copy | drive2.ru: VW Golf Mk2 PF Digifant II ECU pinout | https://www.drive2.ru/l/9886121 | — | — | — |