ECU - Electronic Control Unit Connector.
The 1994–1997 Mitsubishi 3000GT VR4 uses a Mitsubishi MPI (Multi-Point Injection) engine control unit to manage the twin-turbocharged 6G72 3.0 litre DOHC V6, which also drives all four wheels via the AWD system. From the 1994 model year the turbocharged ECM uses a four-block connector (terminals 1–26, 31–46, 51–62, 71–92); the terminal numbering below follows that connector as documented in the factory service manual’s ECM terminal-voltage check chart. The Z16A platform is shared with the Dodge Stealth R/T Twin Turbo, which uses identical ECU hardware and connector assignments.
| Pin | Signal | Type |
|---|---|---|
| 1 | Injector 1 | Output |
| 2 | Injector 3 | Output |
| 3 | Injector 5 | Output |
| 4 | Idle air control motor coil A1 | Output |
| 5 | Idle air control motor coil B1 | Output |
| 6 | EGR solenoid | Output |
| 8 | MFI relay control (fuel pump) | Output |
| 9 | Evaporative emission purge solenoid | Output |
| 10 | Ignition power transistor unit A | Output |
| 11 | Ignition power transistor unit C | Output |
| 12 | Power supply | Power |
| 13 | Power ground | Ground |
| 14 | Injector 2 | Output |
| 15 | Injector 4 | Output |
| 16 | Injector 6 | Output |
| 17 | Idle air control motor coil A2 | Output |
| 18 | Idle air control motor coil B2 | Output |
| 19 | Volume air flow sensor reset signal | Output |
| 20 | Radiator fan motor relay (high) | Output |
| 21 | Radiator fan motor relay (low) | Output |
| 22 | Air conditioning relay | Output |
| 23 | Ignition power transistor unit B | Output |
| 25 | Power supply | Power |
| 26 | Power ground | Ground |
| 31 | Fuel pump relay 2 | Output |
| 32 | Turbocharger wastegate solenoid | Output |
| 36 | Check engine / MIL lamp | Output |
| 37 | Power steering pressure switch | Input |
| 38 | MFI relay control (power supply) | Output |
| 44 | Anti-lock braking signal | Input |
| 45 | Air conditioning switch 1 | Input |
| 52 | Ignition timing adjustment terminal | Input |
| 59 | Air conditioning switch 2 | Input |
| 61 | Sensor reference voltage (5 V) | Power |
| 71 | Ignition switch-ST (M/T) | Input |
| 72 | Intake air temperature sensor | Analog |
| 75 | Heated oxygen sensor, front (right bank) | Analog |
| 76 | Heated oxygen sensor, front (left bank) | Analog |
| 80 | Back-up power supply | Power |
| 82 | Ignition switch-IG | Input |
| 83 | Engine coolant (water) temperature sensor | Analog |
| 84 | Throttle position sensor | Analog |
| 85 | Barometric (atmospheric) pressure sensor | Analog |
| 86 | Vehicle speed sensor | Speed |
| 87 | Closed throttle position switch | Input |
| 88 | Camshaft position sensor | Speed |
| 89 | Crankshaft position sensor | Speed |
| 90 | Volume air flow sensor | Analog |
| 91 | Park/Neutral position switch (A/T) | Input |
Notes
The ECU connector is a four-block housing (terminals 1–26, 31–46, 51–62, 71–92); the numbers above are the factory terminal numbers from the ECM terminal-voltage check chart. The two dedicated ECU power grounds are pins 13 and 26.
Terminals that changed for 1996+ (turbo): Engine ignition signal 58 → 51; Electric-load switch 24 → 58; Fuel-pressure solenoid 7 → 40; Turbo meter 41 → 39; Muffler-mode changeover switch 34 → 61; Heated oxygen sensor (rear) 60 → 73 and 79. A/T-only lines: “reduce-torque” request 46 and 43 (→ 60 for 1996+), execution 7.
The VR4 carries extra boost-management and AWD control circuits absent on the SOHC non-turbo (FWD) 3000GT ECU. The Dodge Stealth R/T Twin Turbo is platform-identical to the 3000GT VR4 and shares the same ECU, connector, and pin assignments.
Signals
- Injector 1–6 — sequential fuel injector drive outputs for each cylinder of the 6G72 V6; pins 1–3 and 14–16 carry the six injector signals
- Power Ground — chassis/power ground reference for the ECU; two pins (13 and 26) provide the dedicated ground paths
- Air Intake Temperature Sensor — analogue signal from the intake air temperature sensor; used to correct fuelling for air density
- O2 Sensor #1 (Right Bank) — analogue exhaust oxygen feedback signal from the right-bank front sensor; used for closed-loop fuel trim
- O2 Sensor #2 (Left Bank) — analogue exhaust oxygen feedback signal from the left-bank front sensor; used for closed-loop fuel trim on the second bank
- Engine Coolant Temperature Sensor — analogue signal from the coolant temperature sensor; used for warm-up enrichment and fan control
- Throttle Position Sensor — analogue voltage signal indicating throttle plate angle; used for load calculation and acceleration enrichment
- Atmospheric Pressure Sensor — analogue signal from the barometric pressure sensor; used for altitude-based fuelling correction and boost reference
- Vehicle Speed Sensor — frequency signal proportional to vehicle speed; used for idle control and speed-density calculations
- Volume Air Flow Sensor — analogue signal from the mass/volume airflow meter; primary load signal for the MPI system
References
- Mitsubishi 3000GT Service Manual 1992-1996 — Volume 1 (Engine) — MPI section 13A, “Engine Control Module (ECM) Terminal Voltage Check Chart” (Z9FU0393 connector) and ECM power-ground figure (13A-199).
- Mitsubishi 3000GT Service Manual 1992-1996 — Volume 2 (Electrical)