VW Golf/Jetta Mk2 1.8 8v Digifant II → AMP EFI MS3Pro Mini (auto)
VW Golf/Jetta Mk2 1.8 8v Digifant II — AMP EFI — MS3Pro Mini
⚠ 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 | 23 wires · 5 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 | MS3PROMINI-A-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-A-13 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-19 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | SP-GND-1 | MS3PROMINI-A-22 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-5 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-6 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-A-17 | MS3PROMINI-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-18 | MS3PROMINI-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-25 | MS3PROMINI-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-12 | MS3PROMINI-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-A-3 | MS3PROMINI-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-A-21 | MS3PROMINI-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-A-10 | MS3PROMINI-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-22 | MS3PROMINI-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-23 | MS3PROMINI-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-A-2 | MS3PROMINI-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-9 | MS3PROMINI-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-A-1 | MS3PROMINI-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-11 | MS3PROMINI-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-16 | MS3PROMINI-A-35 | 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 | MS3PROMINI-A-1 | MS3PROMINI-A-21 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | MS3PROMINI-A-2 | MS3PROMINI-A-21 | open (OL) | 5 V sensor reference must not touch sensor ground | |
| 3 | MS3PROMINI-A-1 | MS3PROMINI-A-2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | MS3PROMINI-A-22 | MS3PROMINI-A-1 | open (OL) | power ground must not touch +12 V supply | |
| 5 | MS3PROMINI-A-22 | MS3PROMINI-A-2 | open (OL) | power ground 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
MS3PROMINI-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 12V+ switched power in | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 10 | Injector out F | — | W13 | — | 0.5 | OEM-A-12 | — | — | — |
| 11 | Injector out G | — | W18 | — | 0.5 | OEM-A-23 | — | — | — |
| 12 | Injector out H | — | — | — | — | — | — | — | — |
| 13 | Analog in 1 | — | W15 | — | 0.5 | OEM-A-21 | — | — | — |
| 14 | Analog in 2 | — | W19 | — | 0.5 | OEM-A-2 | — | — | — |
| 15 | Analog in 3 | — | — | — | — | — | — | — | — |
| 16 | Analog in 4 | — | — | — | — | — | — | — | — |
| 17 | Spark out A | — | W12 | — | 0.5 | OEM-A-25 | — | — | — |
| 18 | Spark out B | — | — | — | — | — | — | — | — |
| 19 | Spark out C | — | — | — | — | — | — | — | — |
| 2 | +5V VREF out | — | W10 | — | 0.5 | OEM-A-17 | — | — | — |
| 20 | Spark out D | — | — | — | — | — | — | — | — |
| 21 | Sensor ground | — | W9 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Power ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 23 | Power ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 24 | CAN Low | — | — | — | — | — | — | — | — |
| 25 | CAN High | — | — | — | — | — | — | — | — |
| 26 | CLT in | — | W16 | — | 0.5 | OEM-A-10 | — | — | — |
| 27 | IAT in | — | W20 | — | 0.5 | OEM-A-9 | — | — | — |
| 28 | TPS in | — | — | — | — | — | — | — | — |
| 29 | Digital switched in 1 / Flex fuel | — | W21 | — | 0.5 | OEM-A-1 | — | — | — |
| 3 | PWM out 1 / Idle | — | W17 | — | 0.5 | OEM-A-22 | — | — | — |
| 30 | CKP+ | — | — | — | — | — | — | — | — |
| 31 | CKP- | — | — | — | — | — | — | — | — |
| 32 | CMP+ | — | W11 | — | 0.5 | OEM-A-18 | — | — | — |
| 33 | CMP- | — | — | — | — | — | — | — | — |
| 34 | Digital frequency in 1 (Hall) | — | W22 | — | 0.5 | OEM-A-11 | — | — | — |
| 35 | Digital frequency in 2 (Hall) | — | W23 | — | 0.5 | OEM-A-16 | — | — | — |
| 4 | Fuel pump out | — | W14 | — | 0.5 | OEM-A-3 | — | — | — |
| 5 | Injector out A | — | — | — | — | — | — | — | — |
| 6 | Injector out B | — | — | — | — | — | — | — | — |
| 7 | Injector out C | — | — | — | — | — | — | — | — |
| 8 | Injector out D | — | — | — | — | — | — | — | — |
| 9 | Injector out E | — | — | — | — | — | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Starter signal (term 50) | — | W21 | — | 0.5 | MS3PROMINI-A-29 | — | — | — |
| 10 | Coolant temperature sensor | — | W16 | — | 0.5 | MS3PROMINI-A-26 | — | — | — |
| 11 | Idle/WOT throttle switch | — | W22 | — | 0.5 | MS3PROMINI-A-34 | — | — | — |
| 12 | Injector driver (batch, all 4) | — | W13 | — | 0.5 | MS3PROMINI-A-10 | — | — | — |
| 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 | — | W23 | — | 0.5 | MS3PROMINI-A-35 | — | — | — |
| 17 | AFM potentiometer supply | — | W10 | — | 0.5 | MS3PROMINI-A-2 | — | — | — |
| 18 | Hall sender signal (engine speed) | — | W11 | — | 0.5 | MS3PROMINI-A-32 | — | — | — |
| 19 | Ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 2 | Oxygen (lambda) sensor signal | — | W19 | — | 0.5 | MS3PROMINI-A-14 | — | — | — |
| 21 | AFM signal | — | W15 | — | 0.5 | MS3PROMINI-A-13 | — | — | — |
| 22 | Idle stabilizer valve coil 1 | — | W17 | — | 0.5 | MS3PROMINI-A-3 | — | — | — |
| 23 | Idle stabilizer valve coil 2 | — | W18 | — | 0.5 | MS3PROMINI-A-11 | — | — | — |
| 25 | Ignition timing signal to TCI | — | W12 | — | 0.5 | MS3PROMINI-A-17 | — | — | — |
| 3 | Fuel pump relay control | — | W14 | — | 0.5 | MS3PROMINI-A-4 | — | — | — |
| 4 | Knock sensor signal | — | — | — | — | — | — | — | — |
| 5 | Knock sensor return | — | W7 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Sensor ground (CTS/Hall/AFM/throttle) | — | W8 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | Knock sensor shield | — | — | — | — | — | — | — | — |
| 8 | Hall sender supply (distributor) | — | — | — | — | — | — | — | — |
| 9 | Intake air temperature sensor | — | W20 | — | 0.5 | MS3PROMINI-A-27 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W7 | — | 0.5 | OEM-A-5 | — | — | — |
| 1 | — | — | W8 | — | 0.5 | OEM-A-6 | — | — | — |
| 1 | — | — | W9 | — | 0.5 | MS3PROMINI-A-21 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-14 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | MS3PROMINI-A-1 | — | — | — |
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 | MS3PROMINI-A-22 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | MS3PROMINI-A-23 | — | — | — |
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 | MS3PROMINI-A-29 | Digital switched in 1 / Flex fuel | digital_in | corroborated | |
| OEM-A-10 | Coolant temperature sensor | temp_in | MS3PROMINI-A-26 | CLT in | temp_in | corroborated | |
| OEM-A-11 | Idle/WOT throttle switch | digital_in | MS3PROMINI-A-34 | Digital frequency in 1 (Hall) | digital_in | corroborated | |
| OEM-A-12 | Injector driver (batch, all 4) | injector_out | MS3PROMINI-A-10 | Injector out F | injector_out | corroborated | |
| OEM-A-13 | Ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | corroborated | |
| OEM-A-14 | ECU power (control-unit relay) | power_in | MS3PROMINI-A-1 | 12V+ switched power in | power_in | corroborated | |
| OEM-A-16 | A/C compressor signal | digital_in | MS3PROMINI-A-35 | Digital frequency in 2 (Hall) | digital_in | corroborated | |
| OEM-A-17 | AFM potentiometer supply | vref | MS3PROMINI-A-2 | +5V VREF out | vref | corroborated | |
| OEM-A-18 | Hall sender signal (engine speed) | trigger_in | MS3PROMINI-A-32 | CMP+ | trigger_in | corroborated | |
| OEM-A-19 | Ground | ground | MS3PROMINI-A-22 + MS3PROMINI-A-23 | Power ground + Power ground | ground | corroborated | |
| OEM-A-2 | Oxygen (lambda) sensor signal | lambda_nb_in | MS3PROMINI-A-14 | Analog in 2 | analog_in | corroborated | |
| OEM-A-21 | AFM signal | analog_in | MS3PROMINI-A-13 | Analog in 1 | analog_in | corroborated | |
| OEM-A-22 | Idle stabilizer valve coil 1 | low_side_out | MS3PROMINI-A-3 | PWM out 1 / Idle | low_side_out | corroborated | |
| OEM-A-23 | Idle stabilizer valve coil 2 | low_side_out | MS3PROMINI-A-11 | Injector out G | injector_out | corroborated | |
| OEM-A-25 | Ignition timing signal to TCI | ignition_out | MS3PROMINI-A-17 | Spark out A | ignition_out | corroborated | |
| OEM-A-3 | Fuel pump relay control | low_side_out | MS3PROMINI-A-4 | Fuel pump out | low_side_out | corroborated | |
| OEM-A-4 | Knock sensor signal | knock_in | — | — | — | corroborated | |
| OEM-A-5 | Knock sensor return | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | corroborated | |
| OEM-A-6 | Sensor ground (CTS/Hall/AFM/throttle) | sensor_ground | MS3PROMINI-A-21 | Sensor ground | sensor_ground | corroborated | |
| OEM-A-7 | Knock sensor shield | shield | — | — | — | corroborated | |
| OEM-A-8 | Hall sender supply (distributor) | power_in | — | — | — | corroborated | |
| OEM-A-9 | Intake air temperature sensor | temp_in | MS3PROMINI-A-27 | IAT in | 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 | MS3PROMINI-A-1 | 0.85 | no route | 12V+ switched power in | — | |
| 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 | MS3PROMINI-A-22 | 0.85 | no route | Power ground | — | |
| W6 | SP-GND-1 | MS3PROMINI-A-23 | 0.85 | no route | Power ground | — | |
| W7 | OEM-A-5 | SP-0V-1 | 0.5 | no route | Knock sensor return | — | |
| W8 | OEM-A-6 | SP-0V-1 | 0.5 | no route | Sensor ground (CTS/Hall/AFM/throttle) | — | |
| W9 | SP-0V-1 | MS3PROMINI-A-21 | 0.5 | no route | Sensor ground | — | |
| W10 | OEM-A-17 | MS3PROMINI-A-2 | 0.5 | no route | AFM potentiometer supply | — | |
| W11 | OEM-A-18 | MS3PROMINI-A-32 | 0.5 | no route | Hall sender signal (engine speed) | — | |
| W12 | OEM-A-25 | MS3PROMINI-A-17 | 0.5 | no route | Ignition timing signal to TCI | — | |
| W13 | OEM-A-12 | MS3PROMINI-A-10 | 0.5 | no route | Injector driver (batch, all 4) | — | |
| W14 | OEM-A-3 | MS3PROMINI-A-4 | 0.5 | no route | Fuel pump relay control | — | |
| W15 | OEM-A-21 | MS3PROMINI-A-13 | 0.5 | no route | AFM signal | — | |
| W16 | OEM-A-10 | MS3PROMINI-A-26 | 0.5 | no route | Coolant temperature sensor | — | |
| W17 | OEM-A-22 | MS3PROMINI-A-3 | 0.5 | no route | Idle stabilizer valve coil 1 | — | |
| W18 | OEM-A-23 | MS3PROMINI-A-11 | 0.5 | no route | Idle stabilizer valve coil 2 | — | |
| W19 | OEM-A-2 | MS3PROMINI-A-14 | 0.5 | no route | Oxygen (lambda) sensor signal | — | |
| W20 | OEM-A-9 | MS3PROMINI-A-27 | 0.5 | no route | Intake air temperature sensor | — | |
| W21 | OEM-A-1 | MS3PROMINI-A-29 | 0.5 | no route | Starter signal (term 50) | — | |
| W22 | OEM-A-11 | MS3PROMINI-A-34 | 0.5 | no route | Idle/WOT throttle switch | — | |
| W23 | OEM-A-16 | MS3PROMINI-A-35 | 0.5 | no route | A/C compressor signal | — |
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. |
| info | NET_FAMILY | OEM-A-23 ↔ MS3PROMINI-A-11 | OEM-A-23 "Idle stabilizer valve coil 2" [low_side_out] is wired to MS3PROMINI-A-11 "Injector out G" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 2 optional OEM pins are not mapped: OEM-A-4 Knock sensor signal; OEM-A-7 Knock sensor shield |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
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 AMP EFI MS3Pro Mini - OEM-A 7: Knock sensor shield: no shield pin on AMP EFI MS3Pro Mini
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AMP EFI: MS3Pro Mini manual (fw 1.6.1) pinout & output ratings | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_Mini.pdf?v=1760643335 | archive | 2026-10-05 | bed7d8ae8408 |
| 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 | — | — | — |