VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 → Haltech Elite 2500 HT-151300 (auto)
VW Corrado VR6 12v (AAA) Motronic M2.9 OBD1 — Haltech — Elite 2500
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-11
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 | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 50 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-23 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | ELITE2500-A-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | ELITE2500-B-11 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-A-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-A-10 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-A-55 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-A-56 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | OEM-A-7 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | ELITE2500-A-10 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | ELITE2500-A-11 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-A-16 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-A-33 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-A-67 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | SP-0V-1 | ELITE2500-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | ELITE2500-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | ELITE2500-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-A-41 | ELITE2500-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-A-68 | ELITE2500-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | ELITE2500-B-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-A-44 | ELITE2500-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | ELITE2500-B-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-A-34 | ELITE2500-B-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-A-8 | ELITE2500-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-A-60 | ELITE2500-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-A-52 | ELITE2500-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-A-24 | ELITE2500-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-A-3 | ELITE2500-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-A-26 | ELITE2500-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-A-4 | ELITE2500-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-A-25 | ELITE2500-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-A-2 | ELITE2500-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-A-38 | ELITE2500-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-A-17 | ELITE2500-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-A-40 | ELITE2500-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-A-14 | ELITE2500-B-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-A-49 | ELITE2500-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-A-6 | ELITE2500-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-A-9 | ELITE2500-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-A-27 | ELITE2500-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-A-31 | ELITE2500-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-A-5 | ELITE2500-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-A-53 | ELITE2500-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-A-22 | ELITE2500-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-A-51 | ELITE2500-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-A-20 | ELITE2500-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-A-15 | ELITE2500-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-A-36 | ELITE2500-B-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-A-65 | ELITE2500-B-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-A-37 | ELITE2500-B-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-A-39 | ELITE2500-B-10 | 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 | ELITE2500-A-10 | ELITE2500-A-26 | open (OL) | power ground must not touch +12 V supply | |
| 2 | ELITE2500-A-10 | ELITE2500-A-9 | open (OL) | power ground must not touch 5 V sensor reference | |
| 3 | ELITE2500-A-26 | ELITE2500-A-9 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 4 | ELITE2500-B-14 | ELITE2500-A-26 | open (OL) | sensor ground must not touch +12 V supply | |
| 5 | ELITE2500-B-14 | ELITE2500-A-9 | open (OL) | sensor 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
ELITE2500-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | DPO 2 | — | W39 | — | 0.5 | OEM-A-27 | — | — | — |
| 10 | Battery ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 11 | Battery ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 12 | +8V DC | — | — | — | — | — | — | — | — |
| 13 | 12V ignition input | — | W32 | — | 0.5 | OEM-A-38 | — | — | — |
| 14 | AVI 10 (TPS) | — | — | — | — | — | — | — | — |
| 15 | AVI 9 (MAP) | — | — | — | — | — | — | — | — |
| 16 | AVI 2 | — | W34 | — | 0.5 | OEM-A-40 | — | — | — |
| 17 | AVI 3 | — | W45 | — | 0.5 | OEM-A-20 | — | — | — |
| 18 | DPO 1 | — | W38 | — | 0.5 | OEM-A-9 | — | — | — |
| 19 | INJ 1 | — | W26 | — | 0.5 | OEM-A-24 | — | — | — |
| 2 | AVI 4 | — | W46 | — | 0.5 | OEM-A-15 | — | — | — |
| 20 | INJ 2 | — | W27 | — | 0.5 | OEM-A-3 | — | — | — |
| 21 | INJ 3 | — | W28 | — | 0.5 | OEM-A-26 | — | — | — |
| 22 | INJ 4 | — | W29 | — | 0.5 | OEM-A-4 | — | — | — |
| 23 | DPO 3 | — | W40 | — | 0.5 | OEM-A-31 | — | — | — |
| 24 | DPO 5 (fuel pump trigger) | — | W37 | — | 0.5 | OEM-A-6 | — | — | — |
| 25 | DPO 6 (ECR OUT) | — | W36 | — | 0.5 | OEM-A-49 | — | — | — |
| 26 | ECU injector power input | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | INJ 5 | — | W30 | — | 0.5 | OEM-A-25 | — | — | — |
| 28 | INJ 6 | — | W31 | — | 0.5 | OEM-A-2 | — | — | — |
| 29 | INJ 7 | — | — | — | — | — | — | — | — |
| 3 | IGN 1 | — | W23 | — | 0.5 | OEM-A-8 | — | — | — |
| 30 | INJ 8 | — | — | — | — | — | — | — | — |
| 31 | Stepper 1 P1 / DPO | — | W42 | — | 0.5 | OEM-A-53 | — | — | — |
| 32 | Stepper 1 P2 / DPO | — | W43 | — | 0.5 | OEM-A-22 | — | — | — |
| 33 | Stepper 1 P3 / DPO | — | W44 | — | 0.5 | OEM-A-51 | — | — | — |
| 34 | Stepper 1 P4 / DPO | — | — | — | — | — | — | — | — |
| 4 | IGN 2 | — | W24 | — | 0.5 | OEM-A-60 | — | — | — |
| 5 | IGN 3 | — | W25 | — | 0.5 | OEM-A-52 | — | — | — |
| 6 | IGN 4 | — | — | — | — | — | — | — | — |
| 7 | IGN 5 | — | — | — | — | — | — | — | — |
| 8 | IGN 6 | — | — | — | — | — | — | — | — |
| 9 | +5V DC | — | W17 | — | 0.5 | OEM-A-41 | — | — | — |
ELITE2500-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Crank (Trigger) (+) | — | W18 | — | 0.5 | OEM-A-68 | — | — | — |
| 10 | SPI 3 | — | W50 | — | 0.5 | OEM-A-39 | — | — | — |
| 11 | +13.8V ECU supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 12 | AVI 6 (O2 Input 1) | — | — | — | — | — | — | — | — |
| 13 | AVI 1 (O2 Input 2) | — | W33 | — | 0.5 | OEM-A-17 | — | — | — |
| 14 | Signal ground | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 15 | Signal ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Signal ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | IGN 7 | — | — | — | — | — | — | — | — |
| 18 | IGN 8 | — | — | — | — | — | — | — | — |
| 19 | DPO 4 | — | W41 | — | 0.5 | OEM-A-5 | — | — | — |
| 2 | Cam (Home) (+) | — | W20 | — | 0.5 | OEM-A-44 | — | — | — |
| 20 | AVI 5 | — | — | — | — | — | — | — | — |
| 21 | KNOCK 1 | — | W22 | — | 0.5 | OEM-A-34 | — | — | — |
| 22 | KNOCK 2 | — | — | — | — | — | — | — | — |
| 23 | CAN H | — | — | — | — | — | — | — | — |
| 24 | CAN L | — | — | — | — | — | — | — | — |
| 25 | DBW 1 / DPO | — | — | — | — | — | — | — | — |
| 26 | DBW 2 / DPO | — | — | — | — | — | — | — | — |
| 3 | AVI 7 (Air Temp) | — | W47 | — | 0.5 | OEM-A-36 | — | — | — |
| 4 | AVI 8 (Coolant Temp) | — | W35 | — | 0.5 | OEM-A-14 | — | — | — |
| 5 | Crank (Trigger) (−) | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 6 | Cam (Home) (−) | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 7 | SPI 4 | — | — | — | — | — | — | — | — |
| 8 | SPI 1 | — | W48 | — | 0.5 | OEM-A-65 | — | — | — |
| 9 | SPI 2 | — | W49 | — | 0.5 | OEM-A-37 | — | — | — |
OEM-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Ground (E-1) | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 10 | Ground (OBD1 EGR enable) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Coolant temperature (CLT) | — | W35 | — | 0.5 | ELITE2500-B-4 | — | — | — |
| 15 | EGR temperature sensor | — | W46 | — | 0.5 | ELITE2500-A-2 | — | — | — |
| 16 | MAF ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | MAF signal | — | W33 | — | 0.5 | ELITE2500-B-13 | — | — | — |
| 2 | Injector 6 (cyl 6) | — | W31 | — | 0.5 | ELITE2500-A-28 | — | — | — |
| 20 | O2 sensor 1 (primary) | — | W45 | — | 0.5 | ELITE2500-A-17 | — | — | — |
| 21 | Diagnostic L-line | — | — | — | — | — | — | — | — |
| 22 | Tachometer output | — | W43 | — | 0.5 | ELITE2500-A-32 | — | — | — |
| 23 | ECU main power (from engine-electronics relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 24 | Injector 1 (cyl 1) | — | W26 | — | 0.5 | ELITE2500-A-19 | — | — | — |
| 25 | Injector 5 (cyl 5) | — | W30 | — | 0.5 | ELITE2500-A-27 | — | — | — |
| 26 | Injector 3 (cyl 3) | — | W28 | — | 0.5 | ELITE2500-A-21 | — | — | — |
| 27 | Idle air control valve | — | W39 | — | 0.5 | ELITE2500-A-1 | — | — | — |
| 3 | Injector 2 (cyl 2) | — | W27 | — | 0.5 | ELITE2500-A-20 | — | — | — |
| 31 | EVAP canister purge valve | — | W40 | — | 0.5 | ELITE2500-A-23 | — | — | — |
| 33 | Sensor ground bus | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Knock sensor 1 | — | W22 | — | 0.5 | ELITE2500-B-21 | — | — | — |
| 36 | Intake air temperature (IAT) | — | W47 | — | 0.5 | ELITE2500-B-3 | — | — | — |
| 37 | A/C compressor switch | — | W49 | — | 0.5 | ELITE2500-B-9 | — | — | — |
| 38 | Ignition switch (run/start) | — | W32 | — | 0.5 | ELITE2500-A-13 | — | — | — |
| 39 | A/C switch (cabin) | — | W50 | — | 0.5 | ELITE2500-B-10 | — | — | — |
| 4 | Injector 4 (cyl 4) | — | W29 | — | 0.5 | ELITE2500-A-22 | — | — | — |
| 40 | Throttle position sensor 1 | — | W34 | — | 0.5 | ELITE2500-A-16 | — | — | — |
| 41 | TPS power (+5V) | — | W17 | — | 0.5 | ELITE2500-A-9 | — | — | — |
| 43 | Diagnostic K-line | — | — | — | — | — | — | — | — |
| 44 | Camshaft position sensor (G40) | — | W20 | — | 0.5 | ELITE2500-B-2 | — | — | — |
| 49 | Secondary air injection relay control | — | W36 | — | 0.5 | ELITE2500-A-25 | — | — | — |
| 5 | Check engine light (MIL) | — | W41 | — | 0.5 | ELITE2500-B-19 | — | — | — |
| 51 | MFA fuel-consumption signal | — | W44 | — | 0.5 | ELITE2500-A-33 | — | — | — |
| 52 | Ignition coil 4 (coil pack pin 4) | — | W25 | — | 0.5 | ELITE2500-A-5 | — | — | — |
| 53 | Idle air control valve (2nd) | — | W42 | — | 0.5 | ELITE2500-A-31 | — | — | — |
| 54 | Battery constant (+12V) | — | — | — | — | — | — | — | — |
| 55 | Ground (E-3) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 56 | Ground (E-4) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 59 | Mass airflow sensor (5th terminal) | — | — | — | — | — | — | — | — |
| 6 | Fuel pump relay control | — | W37 | — | 0.5 | ELITE2500-A-24 | — | — | — |
| 60 | Ignition coil 3 (coil pack pin 3) | — | W24 | — | 0.5 | ELITE2500-A-4 | — | — | — |
| 65 | Vehicle speed sensor (VSS) | — | W48 | — | 0.5 | ELITE2500-B-8 | — | — | — |
| 67 | Crank sensor return (VR-) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 68 | Crank position sensor (G28, VR+) | — | W18 | — | 0.5 | ELITE2500-B-1 | — | — | — |
| 7 | Ground (E-2) | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Ignition coil 2 (coil pack pin 2) | — | W23 | — | 0.5 | ELITE2500-A-3 | — | — | — |
| 9 | Engine electronics relay control | — | W38 | — | 0.5 | ELITE2500-A-18 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W11 | — | 0.5 | OEM-A-16 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-A-33 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-A-67 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | ELITE2500-B-14 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | ELITE2500-B-15 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | ELITE2500-B-16 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | ELITE2500-B-5 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | ELITE2500-B-6 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-A-23 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | ELITE2500-A-26 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | ELITE2500-B-11 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-A-1 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-A-10 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-A-55 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-A-56 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | OEM-A-7 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | ELITE2500-A-10 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | ELITE2500-A-11 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-A-1 | Ground (E-1) | ground | ELITE2500-A-10 + ELITE2500-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-A-10 | Ground (OBD1 EGR enable) | ground | ELITE2500-A-10 + ELITE2500-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-A-14 | Coolant temperature (CLT) | temp_in | ELITE2500-B-4 | AVI 8 (Coolant Temp) | analog_in | single_source | |
| OEM-A-15 | EGR temperature sensor | temp_in | ELITE2500-A-2 | AVI 4 | analog_in | single_source | |
| OEM-A-16 | MAF ground | sensor_ground | ELITE2500-B-14 + ELITE2500-B-15 + ELITE2500-B-16 + ELITE2500-B-5 + ELITE2500-B-6 | Signal ground + Signal ground + Signal ground + Crank (Trigger) (−) + Cam (Home) (−) | sensor_ground + trigger_in | single_source | |
| OEM-A-17 | MAF signal | analog_in | ELITE2500-B-13 | AVI 1 (O2 Input 2) | analog_in | single_source | |
| OEM-A-2 | Injector 6 (cyl 6) | injector_out | ELITE2500-A-28 | INJ 6 | injector_out | single_source | |
| OEM-A-20 | O2 sensor 1 (primary) | lambda_nb_in | ELITE2500-A-17 | AVI 3 | analog_in | single_source | |
| OEM-A-21 | Diagnostic L-line | serial | — | — | — | single_source | |
| OEM-A-22 | Tachometer output | tacho_out | ELITE2500-A-32 | Stepper 1 P2 / DPO | switch_out | single_source | |
| OEM-A-23 | ECU main power (from engine-electronics relay) | power_in | ELITE2500-A-26 + ELITE2500-B-11 | ECU injector power input + +13.8V ECU supply | power_in | single_source | |
| OEM-A-24 | Injector 1 (cyl 1) | injector_out | ELITE2500-A-19 | INJ 1 | injector_out | single_source | |
| OEM-A-25 | Injector 5 (cyl 5) | injector_out | ELITE2500-A-27 | INJ 5 | injector_out | single_source | |
| OEM-A-26 | Injector 3 (cyl 3) | injector_out | ELITE2500-A-21 | INJ 3 | injector_out | single_source | |
| OEM-A-27 | Idle air control valve | low_side_out | ELITE2500-A-1 | DPO 2 | low_side_out | single_source | |
| OEM-A-3 | Injector 2 (cyl 2) | injector_out | ELITE2500-A-20 | INJ 2 | injector_out | single_source | |
| OEM-A-31 | EVAP canister purge valve | low_side_out | ELITE2500-A-23 | DPO 3 | low_side_out | single_source | |
| OEM-A-33 | Sensor ground bus | sensor_ground | ELITE2500-B-14 + ELITE2500-B-15 + ELITE2500-B-16 + ELITE2500-B-5 + ELITE2500-B-6 | Signal ground + Signal ground + Signal ground + Crank (Trigger) (−) + Cam (Home) (−) | sensor_ground + trigger_in | single_source | |
| OEM-A-34 | Knock sensor 1 | knock_in | ELITE2500-B-21 | KNOCK 1 | knock_in | single_source | |
| OEM-A-36 | Intake air temperature (IAT) | temp_in | ELITE2500-B-3 | AVI 7 (Air Temp) | analog_in | single_source | |
| OEM-A-37 | A/C compressor switch | digital_in | ELITE2500-B-9 | SPI 2 | digital_in | single_source | |
| OEM-A-38 | Ignition switch (run/start) | digital_in | ELITE2500-A-13 | 12V ignition input | digital_in | single_source | |
| OEM-A-39 | A/C switch (cabin) | digital_in | ELITE2500-B-10 | SPI 3 | digital_in | single_source | |
| OEM-A-4 | Injector 4 (cyl 4) | injector_out | ELITE2500-A-22 | INJ 4 | injector_out | single_source | |
| OEM-A-40 | Throttle position sensor 1 | analog_in | ELITE2500-A-16 | AVI 2 | analog_in | single_source | |
| OEM-A-41 | TPS power (+5V) | vref | ELITE2500-A-9 | +5V DC | vref | single_source | |
| OEM-A-43 | Diagnostic K-line | serial | — | — | — | single_source | |
| OEM-A-44 | Camshaft position sensor (G40) | trigger_in | ELITE2500-B-2 | Cam (Home) (+) | trigger_in | single_source | |
| OEM-A-49 | Secondary air injection relay control | low_side_out | ELITE2500-A-25 | DPO 6 (ECR OUT) | low_side_out | single_source | |
| OEM-A-5 | Check engine light (MIL) | low_side_out | ELITE2500-B-19 | DPO 4 | low_side_out | single_source | |
| OEM-A-51 | MFA fuel-consumption signal | tacho_out | ELITE2500-A-33 | Stepper 1 P3 / DPO | switch_out | single_source | |
| OEM-A-52 | Ignition coil 4 (coil pack pin 4) | ignition_out | ELITE2500-A-5 | IGN 3 | ignition_out | single_source | |
| OEM-A-53 | Idle air control valve (2nd) | low_side_out | ELITE2500-A-31 | Stepper 1 P1 / DPO | switch_out | single_source | |
| OEM-A-54 | Battery constant (+12V) | power_in | — | — | — | single_source | |
| OEM-A-55 | Ground (E-3) | ground | ELITE2500-A-10 + ELITE2500-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-A-56 | Ground (E-4) | ground | ELITE2500-A-10 + ELITE2500-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-A-59 | Mass airflow sensor (5th terminal) | sensor_out | — | — | — | single_source | |
| OEM-A-6 | Fuel pump relay control | low_side_out | ELITE2500-A-24 | DPO 5 (fuel pump trigger) | low_side_out | single_source | |
| OEM-A-60 | Ignition coil 3 (coil pack pin 3) | ignition_out | ELITE2500-A-4 | IGN 2 | ignition_out | single_source | |
| OEM-A-65 | Vehicle speed sensor (VSS) | digital_in | ELITE2500-B-8 | SPI 1 | digital_in | single_source | |
| OEM-A-67 | Crank sensor return (VR-) | sensor_ground | ELITE2500-B-14 + ELITE2500-B-15 + ELITE2500-B-16 + ELITE2500-B-5 + ELITE2500-B-6 | Signal ground + Signal ground + Signal ground + Crank (Trigger) (−) + Cam (Home) (−) | sensor_ground + trigger_in | single_source | |
| OEM-A-68 | Crank position sensor (G28, VR+) | trigger_in | ELITE2500-B-1 | Crank (Trigger) (+) | trigger_in | single_source | |
| OEM-A-7 | Ground (E-2) | ground | ELITE2500-A-10 + ELITE2500-A-11 | Battery ground + Battery ground | ground | single_source | |
| OEM-A-8 | Ignition coil 2 (coil pack pin 2) | ignition_out | ELITE2500-A-3 | IGN 1 | ignition_out | single_source | |
| OEM-A-9 | Engine electronics relay control | low_side_out | ELITE2500-A-18 | DPO 1 | low_side_out | single_source |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-A-23 | SP-14V-1 | 0.85 | no route | ECU main power (from engine-electronics relay) | — | |
| W2 | SP-14V-1 | ELITE2500-A-26 | 0.85 | no route | ECU injector power input | — | |
| W3 | SP-14V-1 | ELITE2500-B-11 | 0.85 | no route | +13.8V ECU supply | — | |
| W4 | OEM-A-1 | SP-GND-1 | 0.85 | no route | Ground (E-1) | — | |
| W5 | OEM-A-10 | SP-GND-1 | 0.85 | no route | Ground (OBD1 EGR enable) | — | |
| W6 | OEM-A-55 | SP-GND-1 | 0.85 | no route | Ground (E-3) | — | |
| W7 | OEM-A-56 | SP-GND-1 | 0.85 | no route | Ground (E-4) | — | |
| W8 | OEM-A-7 | SP-GND-1 | 0.85 | no route | Ground (E-2) | — | |
| W9 | SP-GND-1 | ELITE2500-A-10 | 0.85 | no route | Battery ground | — | |
| W10 | SP-GND-1 | ELITE2500-A-11 | 0.85 | no route | Battery ground | — | |
| W11 | OEM-A-16 | SP-0V-1 | 0.5 | no route | MAF ground | — | |
| W12 | OEM-A-33 | SP-0V-1 | 0.5 | no route | Sensor ground bus | — | |
| W13 | OEM-A-67 | SP-0V-1 | 0.5 | no route | Crank sensor return (VR-) | — | |
| W14 | SP-0V-1 | ELITE2500-B-14 | 0.5 | no route | Signal ground | — | |
| W15 | SP-0V-1 | ELITE2500-B-15 | 0.5 | no route | Signal ground | — | |
| W16 | SP-0V-1 | ELITE2500-B-16 | 0.5 | no route | Signal ground | — | |
| W17 | OEM-A-41 | ELITE2500-A-9 | 0.5 | no route | TPS power (+5V) | — | |
| W18 | OEM-A-68 | ELITE2500-B-1 | 0.5 | no route | Crank position sensor (G28, VR+) | — | |
| W19 | SP-0V-1 | ELITE2500-B-5 | 0.5 | no route | Crank (Trigger) (−) | — | |
| W20 | OEM-A-44 | ELITE2500-B-2 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W21 | SP-0V-1 | ELITE2500-B-6 | 0.5 | no route | Cam (Home) (−) | — | |
| W22 | OEM-A-34 | ELITE2500-B-21 | 0.5 | no route | Knock sensor 1 | — | |
| W23 | OEM-A-8 | ELITE2500-A-3 | 0.5 | no route | Ignition coil 2 (coil pack pin 2) | — | |
| W24 | OEM-A-60 | ELITE2500-A-4 | 0.5 | no route | Ignition coil 3 (coil pack pin 3) | — | |
| W25 | OEM-A-52 | ELITE2500-A-5 | 0.5 | no route | Ignition coil 4 (coil pack pin 4) | — | |
| W26 | OEM-A-24 | ELITE2500-A-19 | 0.5 | no route | Injector 1 (cyl 1) | — | |
| W27 | OEM-A-3 | ELITE2500-A-20 | 0.5 | no route | Injector 2 (cyl 2) | — | |
| W28 | OEM-A-26 | ELITE2500-A-21 | 0.5 | no route | Injector 3 (cyl 3) | — | |
| W29 | OEM-A-4 | ELITE2500-A-22 | 0.5 | no route | Injector 4 (cyl 4) | — | |
| W30 | OEM-A-25 | ELITE2500-A-27 | 0.5 | no route | Injector 5 (cyl 5) | — | |
| W31 | OEM-A-2 | ELITE2500-A-28 | 0.5 | no route | Injector 6 (cyl 6) | — | |
| W32 | OEM-A-38 | ELITE2500-A-13 | 0.5 | no route | Ignition switch (run/start) | — | |
| W33 | OEM-A-17 | ELITE2500-B-13 | 0.5 | no route | MAF signal | — | |
| W34 | OEM-A-40 | ELITE2500-A-16 | 0.5 | no route | Throttle position sensor 1 | — | |
| W35 | OEM-A-14 | ELITE2500-B-4 | 0.5 | no route | Coolant temperature (CLT) | — | |
| W36 | OEM-A-49 | ELITE2500-A-25 | 0.5 | no route | Secondary air injection relay control | — | |
| W37 | OEM-A-6 | ELITE2500-A-24 | 0.5 | no route | Fuel pump relay control | — | |
| W38 | OEM-A-9 | ELITE2500-A-18 | 0.5 | no route | Engine electronics relay control | — | |
| W39 | OEM-A-27 | ELITE2500-A-1 | 0.5 | no route | Idle air control valve | — | |
| W40 | OEM-A-31 | ELITE2500-A-23 | 0.5 | no route | EVAP canister purge valve | — | |
| W41 | OEM-A-5 | ELITE2500-B-19 | 0.5 | no route | Check engine light (MIL) | — | |
| W42 | OEM-A-53 | ELITE2500-A-31 | 0.5 | no route | Idle air control valve (2nd) | — | |
| W43 | OEM-A-22 | ELITE2500-A-32 | 0.5 | no route | Tachometer output | — | |
| W44 | OEM-A-51 | ELITE2500-A-33 | 0.5 | no route | MFA fuel-consumption signal | — | |
| W45 | OEM-A-20 | ELITE2500-A-17 | 0.5 | no route | O2 sensor 1 (primary) | — | |
| W46 | OEM-A-15 | ELITE2500-A-2 | 0.5 | no route | EGR temperature sensor | — | |
| W47 | OEM-A-36 | ELITE2500-B-3 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W48 | OEM-A-65 | ELITE2500-B-8 | 0.5 | no route | Vehicle speed sensor (VSS) | — | |
| W49 | OEM-A-37 | ELITE2500-B-9 | 0.5 | no route | A/C compressor switch | — | |
| W50 | OEM-A-39 | ELITE2500-B-10 | 0.5 | no route | A/C switch (cabin) | — |
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 (8)
| Severity | Code | Subject | Message |
|---|---|---|---|
| info | NET_FAMILY | ELITE2500-B-15 ↔ ELITE2500-B-6 | ELITE2500-B-15 "Signal ground" [sensor_ground] is wired to ELITE2500-B-6 "Cam (Home) (−)" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-A-14 ↔ ELITE2500-B-4 | OEM-A-14 "Coolant temperature (CLT)" [temp_in] is wired to ELITE2500-B-4 "AVI 8 (Coolant Temp)" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-15 ↔ ELITE2500-A-2 | OEM-A-15 "EGR temperature sensor" [temp_in] is wired to ELITE2500-A-2 "AVI 4" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-22 ↔ ELITE2500-A-32 | OEM-A-22 "Tachometer output" [tacho_out] is wired to ELITE2500-A-32 "Stepper 1 P2 / DPO" [switch_out]. Frequency output on a general output: set it up as a tacho/frequency output with the right pull-up. |
| info | NET_FAMILY | OEM-A-36 ↔ ELITE2500-B-3 | OEM-A-36 "Intake air temperature (IAT)" [temp_in] is wired to ELITE2500-B-3 "AVI 7 (Air Temp)" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one. |
| info | NET_FAMILY | OEM-A-51 ↔ ELITE2500-A-33 | OEM-A-51 "MFA fuel-consumption signal" [tacho_out] is wired to ELITE2500-A-33 "Stepper 1 P3 / DPO" [switch_out]. Frequency output on a general output: set it up as a tacho/frequency output with the right pull-up. |
| info | NET_FAMILY | OEM-A-53 ↔ ELITE2500-A-31 | OEM-A-53 "Idle air control valve (2nd)" [low_side_out] is wired to ELITE2500-A-31 "Stepper 1 P1 / DPO" [switch_out]. Configure this output as low side. |
| info | UNMAPPED | OEM | 3 optional OEM pins are not mapped: OEM-A-21 Diagnostic L-line; OEM-A-43 Diagnostic K-line; OEM-A-59 Mass airflow sensor (5th terminal) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-A-54 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-A 54: Battery constant (+12V): Haltech Elite 2500 has no battery-constant input; not needed - OEM-A 21: Diagnostic L-line: no free k_line on Haltech Elite 2500 - OEM-A 43: Diagnostic K-line: no free k_line on Haltech Elite 2500 - OEM-A 59: Mass airflow sensor (5th terminal): no rule for class sensor_signal; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Haltech Elite 2500 (HT-151300) spec sheet | https://joeblospeedshop.com/wp-content/uploads/2023/11/HT-151300_SPEC-SHEET-2500-ELITE.pdf | archive | 2026-10-05 | c97da78cb851 |
| 4 | vendor_doc | Haltech Elite 2500 — 26-pin connector pinout | https://support.haltech.com/portal/en/kb/articles/main-connector-26-pin-elite2500 | archive | 2026-10-05 | ea6fd4d27ac7 |
| 4 | vendor_doc | Haltech Elite 2500 — 34-pin main connector pinout | https://support.haltech.com/portal/en/kb/articles/main-connector-34-pin-elite2500 | archive | 2026-10-05 | 4e633dff8340 |
| 2 | community_copy | a2resource: VR6/ABA Motronic M2.9 (OBD1) engine control unit pinout | http://www.a2resource.com/electrical/management/motronicvr6aba.html | — | — | — |