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VW Golf/Jetta Mk2 1.8 8v Digifant II → ECUMASTER EMU Black (auto)

VW Golf/Jetta Mk2 1.8 8v Digifant II — ECUMASTER — EMU Black
⚠ 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.

Statusdraft · not yet verified: nobody has reported building and running this harness
Open errors1: read the Findings page before cutting any wire
Size of the job28 wires · 6 connectors · 0 part lines
ToolsCrimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink
Order of work1. 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.

WireFromToGaugeColourCutLabelCrimp ACrimp BPin APin BContinuity
W1OEM-A-14SP-14V-10.85☐☐☐☐☐☐☐
W2SP-14V-1EMUBLACK-Black-130.85☐☐☐☐☐☐☐
W3OEM-A-13SP-GND-10.85☐☐☐☐☐☐☐
W4OEM-A-19SP-GND-10.85☐☐☐☐☐☐☐
W5SP-GND-1EMUBLACK-Black-270.85☐☐☐☐☐☐☐
W6SP-GND-1EMUBLACK-Black-280.85☐☐☐☐☐☐☐
W7SP-GND-1EMUBLACK-Grey-170.85☐☐☐☐☐☐☐
W8SP-GND-1EMUBLACK-Grey-240.85☐☐☐☐☐☐☐
W9OEM-A-5SP-0V-10.5☐☐☐☐☐☐☐
W10OEM-A-6SP-0V-10.5☐☐☐☐☐☐☐
W11SP-0V-1EMUBLACK-Black-290.5☐☐☐☐☐☐☐
W12SP-0V-1EMUBLACK-Black-380.5☐☐☐☐☐☐☐
W13SP-0V-1EMUBLACK-Black-390.5☐☐☐☐☐☐☐
W14OEM-A-17EMUBLACK-Black-260.5☐☐☐☐☐☐☐
W15OEM-A-18EMUBLACK-Black-210.5☐☐☐☐☐☐☐
W16OEM-A-4EMUBLACK-Black-30.5☐☐☐☐☐☐☐
W17OEM-A-25EMUBLACK-Grey-80.5☐☐☐☐☐☐☐
W18OEM-A-12EMUBLACK-Grey-70.5☐☐☐☐☐☐☐
W19OEM-A-3EMUBLACK-Grey-210.5☐☐☐☐☐☐☐
W20OEM-A-21EMUBLACK-Black-310.5☐☐☐☐☐☐☐
W21OEM-A-10EMUBLACK-Black-50.5☐☐☐☐☐☐☐
W22OEM-A-22EMUBLACK-Grey-130.5☐☐☐☐☐☐☐
W23OEM-A-23EMUBLACK-Grey-50.5☐☐☐☐☐☐☐
W24OEM-A-2EMUBLACK-Black-40.5☐☐☐☐☐☐☐
W25OEM-A-9EMUBLACK-Black-320.5☐☐☐☐☐☐☐
W26OEM-A-1EMUBLACK-Black-100.5☐☐☐☐☐☐☐
W27OEM-A-11EMUBLACK-Black-230.5☐☐☐☐☐☐☐
W28OEM-A-16EMUBLACK-Black-360.5☐☐☐☐☐☐☐

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 AProbe BExpectWhyReading
1EMUBLACK-Black-13EMUBLACK-Black-29open (OL)+12 V supply must not touch sensor ground
2EMUBLACK-Black-26EMUBLACK-Black-29open (OL)5 V sensor reference must not touch sensor ground
3EMUBLACK-Black-13EMUBLACK-Black-26open (OL)+12 V supply must not touch 5 V sensor reference
4EMUBLACK-Black-27EMUBLACK-Black-13open (OL)power ground must not touch +12 V supply
5EMUBLACK-Black-27EMUBLACK-Black-26open (OL)power ground must not touch 5 V sensor reference

If any reading doesn't match, stop and get help before powering up.

Revisions

RevLabelByDate
No revisions yet.

Schematic

EMUBLACK-BlackEMUBLACK-GreyOEM-ASP-0VSP-14VSP-GND

Connectors

EMUBLACK-Black

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Ignition coil #5————————
10Switch #1 In—W26—0.5OEM-A-1———
11RS232 TXD————————
12CAN H————————
13Battery +12V—W2—0.85SP-14V-1———
14Ignition coil #4————————
15EGT in #2————————
16Knock Sensor in #2————————
17Analog In #3————————
18TPS In————————
19WBO Ip————————
2EGT in #1————————
20VSS In————————
21Camsync In #1—W15—0.5OEM-A-18———
22WBO Rcal————————
23Switch #2 In—W27—0.5OEM-A-11———
24RS232 RXD————————
25CAN L————————
26+5V supply—W14—0.5OEM-A-17———
27Power Ground—W5—0.85SP-GND-1———
28Ecu Ground—W6—0.85SP-GND-1———
29Sensor Ground—W11—0.5SP-0V-1———
3Knock Sensor in #1—W16—0.5OEM-A-4———
30Analog In #4————————
31Analog In #1—W20—0.5OEM-A-21———
32IAT In—W25—0.5OEM-A-9———
33WBO VGND————————
34+5V supply————————
35Analog In #5————————
36Switch #3 In—W28—0.5OEM-A-16———
37Analog In #6————————
38Sensor Ground—W12—0.5SP-0V-1———
39Sensor Ground—W13—0.5SP-0V-1———
4Analog In #2—W24—0.5OEM-A-2———
5CLT In—W21—0.5OEM-A-10———
6WBO Vs————————
7Camsync In #2————————
8Primary trigger————————
9Flex Fuel In————————

EMUBLACK-Grey

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Ignition coil #6————————
10H-Bridge #1 Winding B————————
11H-Bridge #2 Winding B————————
12AUX 5————————
13AUX 2 / Injector #8—W22—0.5OEM-A-22———
14Injector #5————————
15Injector #2————————
16Ignition coil #2————————
17Power Ground—W7—0.85SP-GND-1———
18Ignition +12V————————
19WBO Heater————————
2H-Bridge #1 Winding A————————
20AUX 4 / Tacho————————
21AUX 1 / Injector #7—W19—0.5OEM-A-3———
22Injector #6————————
23Injector #3————————
24Power Ground—W8—0.85SP-GND-1———
3H-Bridge #2 Winding A————————
4AUX 6————————
5AUX 3—W23—0.5OEM-A-23———
6Injector #4————————
7Injector #1—W18—0.5OEM-A-12———
8Ignition coil #1—W17—0.5OEM-A-25———
9Ignition coil #3————————

OEM-A

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1Starter signal (term 50)—W26—0.5EMUBLACK-Black-10———
10Coolant temperature sensor—W21—0.5EMUBLACK-Black-5———
11Idle/WOT throttle switch—W27—0.5EMUBLACK-Black-23———
12Injector driver (batch, all 4)—W18—0.5EMUBLACK-Grey-7———
13Ground—W3—0.85SP-GND-1———
14ECU power (control-unit relay)—W1—0.85SP-14V-1———
16A/C compressor signal—W28—0.5EMUBLACK-Black-36———
17AFM potentiometer supply—W14—0.5EMUBLACK-Black-26———
18Hall sender signal (engine speed)—W15—0.5EMUBLACK-Black-21———
19Ground—W4—0.85SP-GND-1———
2Oxygen (lambda) sensor signal—W24—0.5EMUBLACK-Black-4———
21AFM signal—W20—0.5EMUBLACK-Black-31———
22Idle stabilizer valve coil 1—W22—0.5EMUBLACK-Grey-13———
23Idle stabilizer valve coil 2—W23—0.5EMUBLACK-Grey-5———
25Ignition timing signal to TCI—W17—0.5EMUBLACK-Grey-8———
3Fuel pump relay control—W19—0.5EMUBLACK-Grey-21———
4Knock sensor signal—W16—0.5EMUBLACK-Black-3———
5Knock sensor return—W9—0.5SP-0V-1———
6Sensor ground (CTS/Hall/AFM/throttle)—W10—0.5SP-0V-1———
7Knock sensor shield————————
8Hall sender supply (distributor)————————
9Intake air temperature sensor—W25—0.5EMUBLACK-Black-32———

SP-0V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W9—0.5OEM-A-5———
1——W10—0.5OEM-A-6———
1——W11—0.5EMUBLACK-Black-29———
1——W12—0.5EMUBLACK-Black-38———
1——W13—0.5EMUBLACK-Black-39———

SP-14V

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W1—0.85OEM-A-14———
1——W2—0.85EMUBLACK-Black-13———

SP-GND

CavityFunctionSignalWireColourGauge (mm²)DestinationTerminalSealPlug
1——W3—0.85OEM-A-13———
1——W4—0.85OEM-A-19———
1——W5—0.85EMUBLACK-Black-27———
1——W6—0.85EMUBLACK-Black-28———
1——W7—0.85EMUBLACK-Grey-17———
1——W8—0.85EMUBLACK-Grey-24———

Pin map

OEM pointOEM functionOEM familyTarget pointTarget functionTarget familyWire colourEvidence
OEM-A-1Starter signal (term 50)digital_inEMUBLACK-Black-10Switch #1 Indigital_incorroborated
OEM-A-10Coolant temperature sensortemp_inEMUBLACK-Black-5CLT Intemp_incorroborated
OEM-A-11Idle/WOT throttle switchdigital_inEMUBLACK-Black-23Switch #2 Indigital_incorroborated
OEM-A-12Injector driver (batch, all 4)injector_outEMUBLACK-Grey-7Injector #1injector_outcorroborated
OEM-A-13GroundgroundEMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24Power Ground + Ecu Ground + Power Ground + Power Groundgroundcorroborated
OEM-A-14ECU power (control-unit relay)power_inEMUBLACK-Black-13Battery +12Vpower_incorroborated
OEM-A-16A/C compressor signaldigital_inEMUBLACK-Black-36Switch #3 Indigital_incorroborated
OEM-A-17AFM potentiometer supplyvrefEMUBLACK-Black-26+5V supplyvrefcorroborated
OEM-A-18Hall sender signal (engine speed)trigger_inEMUBLACK-Black-21Camsync In #1trigger_incorroborated
OEM-A-19GroundgroundEMUBLACK-Black-27 + EMUBLACK-Black-28 + EMUBLACK-Grey-17 + EMUBLACK-Grey-24Power Ground + Ecu Ground + Power Ground + Power Groundgroundcorroborated
OEM-A-2Oxygen (lambda) sensor signallambda_nb_inEMUBLACK-Black-4Analog In #2analog_incorroborated
OEM-A-21AFM signalanalog_inEMUBLACK-Black-31Analog In #1analog_incorroborated
OEM-A-22Idle stabilizer valve coil 1low_side_outEMUBLACK-Grey-13AUX 2 / Injector #8low_side_outcorroborated
OEM-A-23Idle stabilizer valve coil 2low_side_outEMUBLACK-Grey-5AUX 3low_side_outcorroborated
OEM-A-25Ignition timing signal to TCIignition_outEMUBLACK-Grey-8Ignition coil #1ignition_outcorroborated
OEM-A-3Fuel pump relay controllow_side_outEMUBLACK-Grey-21AUX 1 / Injector #7low_side_outcorroborated
OEM-A-4Knock sensor signalknock_inEMUBLACK-Black-3Knock Sensor in #1knock_incorroborated
OEM-A-5Knock sensor returnsensor_groundEMUBLACK-Black-29 + EMUBLACK-Black-38 + EMUBLACK-Black-39Sensor Ground + Sensor Ground + Sensor Groundsensor_groundcorroborated
OEM-A-6Sensor ground (CTS/Hall/AFM/throttle)sensor_groundEMUBLACK-Black-29 + EMUBLACK-Black-38 + EMUBLACK-Black-39Sensor Ground + Sensor Ground + Sensor Groundsensor_groundcorroborated
OEM-A-7Knock sensor shieldshield———corroborated
OEM-A-8Hall sender supply (distributor)power_in———corroborated
OEM-A-9Intake air temperature sensortemp_inEMUBLACK-Black-32IAT Intemp_incorroborated

Cut list

WireFromToGauge (mm²)ColourLengthSignalIdent
W1OEM-A-14SP-14V-10.85no routeECU power (control-unit relay)—
W2SP-14V-1EMUBLACK-Black-130.85no routeBattery +12V—
W3OEM-A-13SP-GND-10.85no routeGround—
W4OEM-A-19SP-GND-10.85no routeGround—
W5SP-GND-1EMUBLACK-Black-270.85no routePower Ground—
W6SP-GND-1EMUBLACK-Black-280.85no routeEcu Ground—
W7SP-GND-1EMUBLACK-Grey-170.85no routePower Ground—
W8SP-GND-1EMUBLACK-Grey-240.85no routePower Ground—
W9OEM-A-5SP-0V-10.5no routeKnock sensor return—
W10OEM-A-6SP-0V-10.5no routeSensor ground (CTS/Hall/AFM/throttle)—
W11SP-0V-1EMUBLACK-Black-290.5no routeSensor Ground—
W12SP-0V-1EMUBLACK-Black-380.5no routeSensor Ground—
W13SP-0V-1EMUBLACK-Black-390.5no routeSensor Ground—
W14OEM-A-17EMUBLACK-Black-260.5no routeAFM potentiometer supply—
W15OEM-A-18EMUBLACK-Black-210.5no routeHall sender signal (engine speed)—
W16OEM-A-4EMUBLACK-Black-30.5no routeKnock sensor signal—
W17OEM-A-25EMUBLACK-Grey-80.5no routeIgnition timing signal to TCI—
W18OEM-A-12EMUBLACK-Grey-70.5no routeInjector driver (batch, all 4)—
W19OEM-A-3EMUBLACK-Grey-210.5no routeFuel pump relay control—
W20OEM-A-21EMUBLACK-Black-310.5no routeAFM signal—
W21OEM-A-10EMUBLACK-Black-50.5no routeCoolant temperature sensor—
W22OEM-A-22EMUBLACK-Grey-130.5no routeIdle stabilizer valve coil 1—
W23OEM-A-23EMUBLACK-Grey-50.5no routeIdle stabilizer valve coil 2—
W24OEM-A-2EMUBLACK-Black-40.5no routeOxygen (lambda) sensor signal—
W25OEM-A-9EMUBLACK-Black-320.5no routeIntake air temperature sensor—
W26OEM-A-1EMUBLACK-Black-100.5no routeStarter signal (term 50)—
W27OEM-A-11EMUBLACK-Black-230.5no routeIdle/WOT throttle switch—
W28OEM-A-16EMUBLACK-Black-360.5no routeA/C compressor signal—

Bill of materials

CategoryPart numberManufacturerDescriptionQtyUnit

ECU setup sheet

RoleEngine refEngine signalSensorECU pointECU functionECU classSetup flag
No configured channels.

Findings

Open (2)

SeverityCodeSubjectMessage
errorREQUIRED_UNMAPPEDOEM-A-8Required OEM function "Hall sender supply (distributor)" (power_in) is not connected to the new ECU.
infoUNMAPPEDOEM1 optional OEM pins are not mapped: OEM-A-7 Knock sensor shield

Accepted (0)

CodeSubjectReasonBy

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 7: Knock sensor shield: no shield pin on ECUMASTER EMU Black - EMUBLACK-Grey 18: Ignition +12V: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source

Sources

ReliabilityKindTitleURLArchiveCapturedSHA-256
4vendor_docECUMASTER EMU Black — pinout (Black 39-pin / Grey 24-pin)https://www.ecumaster.com/wp/wp-content/uploads/2020/05/EMU_Black_pinout.pdfarchive2026-10-05096b2b4df1bd
2community_copya2resource: Digifant II engine controller pinout (VW Golf/Jetta Mk2 1.8 8v)http://www.a2resource.com/electrical/management/digifant2.html———
2community_copydrive2.ru: VW Golf Mk2 PF Digifant II ECU pinouthttps://www.drive2.ru/l/9886121———