| PIN | OEM Function |
| Connector 1 | |
| 1A | 12V constant from room fuse |
| 1B | 12V switched from main relay |
| 1C | – |
| 1D | Data-link connector |
| 1E | – |
| 1F | Brake switch (12V switched) |
| 1G | Power steering pressure switch |
| 1H | Constant 12V injector fuse |
| 1I | A/C fan relay |
| 1J | – |
| 1K | Trans system (auto only) |
| 1L | Data-link connector |
| 1M | – |
| 1N | Trans system (auto only) |
| 1O | Alternator field terminal |
| 1P | A/C switch (ground input) |
| 1Q | Alternator warning lamp |
| 1R | Thermo fan relay |
| 1S | A/C compressor relay |
| 1T | Alternator feedback |
| 1U | Lambda sensor heater ground |
| 1V | Clutch/Neutral switch (ground input) |
| Connector 2 | |
| 2A | – |
| 2B | Inlet air temperature sensor |
| 2C | Lambda sensor signal |
| 2D | Vehicle speed signal |
| 2E | Engine coolant temperature sensor signal |
| 2F | Knock sensor input |
| 2G | – |
| 2H | Camshaft position sensor signal |
| 2I | 5V sensor supply |
| 2J | Crankshaft sensor signal |
| 2K | Tachometer output signal to instrument cluster |
| 2L | MAF sensor signal |
| 2M | EGR valve |
| 2N | EGR valve |
| 2O | EGR valve |
| 2P | EGR valve |
| Connector 3 | |
| 3A | Power ground |
| 3B | Power ground |
| 3C | Sensor ground |
| 3D | – |
| 3E | Throttle position sensor signal |
| 3F | Sensor ground |
| 3G | Ignition coil A (Cyl 1 & 4) |
| 3H | Ignition coil B (Cyl 2 & 3) |
| 3I | – |
| 3J | – |
| 3K | – |
| 3L | Purge solenoid |
| 3M | Idle control valve |
| 3N | – |
| 3O | Idle control valve 12V supply |
| 3P | Fuel pump relay |
| 3Q | VICS solenoid |
| 3R | – |
| 3S | EGR boost sensor signal |
| 3T | EGR boost solenoid |
| 3U | – |
| 3V | – |
| 3W | Injector A (cylinder 1) |
| 3X | Injector D (cylinder 2) |
| 3Y | Injector B (cylinder 3) |
| 3Z | Injector C (cylinder 4) |
Note: Pin-out should be checked against your vehicle to confirm accuracy.
Bartune Engineering 