The following tables contain the pin out references for the 3B and ABY ECUs.
Description
The ECU is the central control unit for the engine and all motronic components. It utilises inputs from sensors to
fully control ignition, fueling, boost pressure and emissions and can make on the fly adjustments as required.
A self diagnosis feature allows faults to be stored in memory. Depending on the nature of the fault, the ECU can reduce
power output or shut the engine down.
| Part Number | Model |
|---|---|
| 895 907 404 BA | 3B |
| 895 907 551 A | ABY (up to chassis 8B-R-015000) |
| 895 907 551 B | ABY (from chassis 8B-S-000001 |
The picture below displays the pins of the ecu from an ABY model. Pin 1 and 55 are arrowed.
The following tables contain the pin out references for the 3B and ABY ECUs.
| Pin # | 3B | ABY |
|---|---|---|
| 1 | Output Stage for Ignition Coil | Output Stage for Ignition Cylinder #1 |
| 2 | Coding Plug | Output Stage for Ignition Cylinder #2 |
| 3 | Fuel Pump Relay | Fuel Pump Relay 0v |
| 4 | Idle Stabiliser Valve | Idle Stabiliser Valve |
| 5 | Carbon canister freq valve | EVAP emissions freq valve |
| 6 | Tachometer signal | A/C compressor |
| 7 | Mass Air Flow signal (PIN 3) | Mass Air Flow signal (PIN 3) |
| 8 | Hall Effect Sensor | Camshaft Position Sensor |
| 9 | n/a | Barometric Pressure Sensor |
| 10 | Gnd (0v) | Gnd (0v) |
| 11 | Knock Sensor (cyl 1-3) | Knock Sensor (cyl 1-3) |
| 12 | Vref (12v) | Vref (12v) |
| 13 | OBD Connector (L line) | OBD Connector (L line) |
| 14 | Gnd (0v) | Gnd (0v) |
| 15 | Fuel Injector #3 | n/a |
| 16 | Fuel injector #2 | Fuel injector #5 |
| 17 | Fuel Injector #1 | Fuel injector #2 |
| 18 | 12v battery feed (via fuse #27) | 12v battery feed (via fuse #27) |
| 19 | Gnd (0v) | Gnd (0v) |
| 20 | n/a | Output Stage for Ignition Cylinder #4 |
| 21 | n/a | Output Stage for Ignition Cylinder #5 |
| 22 | OBD Signal (blink) | OBD Signal (blink) |
| 23 | WGFV | Output Stage for Ignition Cylinder #3 |
| 24 | Gnd (0v) | Gnd (0v) |
| 25 | Mass Air Flow signal (PIN 4) | Mass Air Flow signal (PIN 4) |
| 26 | Mass Air Flow signal (PIN 2) | Mass Air Flow signal (PIN 2) |
| 27 | Switched 12V (ignition on) | Switched 12V (ignition on) |
| 28 | Lambda Sensor | Lambda Sensor |
| 29 | Knock Sensor 2 (cyl 4,5) | Knock Sensor 2 (cyl 4,5) |
| 30 | Gnd (0v) | Gnd (0v) |
| 31 | Boost Pressure signal for Multi function Computer | Fuel Consumption Signal for Multi function Computer |
| 32 | Fuel Consumption Signal for Multi function Computer | Charge Pressure signal for Multi function Computer |
| 33 | n/a | WGFV |
| 34 | Fuel Injector #5 | Fuel Injector #3 |
| 35 | Fuel Injector #4 | Fuel Injector #4 |
| 36 | Multi Function Temp sender (pin 2) | Fuel Injector #1 |
| 37 | 12v Battery feed (via fuse #28) | Switched 12v supply via Fuel pump relay |
| 38 | Coding plug | Coding plug |
| 39 | Coding plug | Coding plug |
| 40 | A/C compressor (ON/OFF) | Tachometer signal |
| 41 | A/C compressor (idle speed) | Air Con status |
| 42 | n/a | n/a |
| 43 | n/a | n/a |
| 44 | Air Intake temp sensor | Air Intake temp sensor |
| 45 | Coolant Temp sensor | Coolant Temp sensor |
| 46 | Altitude Sensor | n/a |
| 47 | Engine Speed Sensor | Crankshaft ref position sensor |
| 48 | Ref for Engine speed / crankshaft position sensors | Ref for crankshaft speed/position sensors |
| 49 | Crankshaft position sensor | Crankshaft speed sensor |
| 50 | n/a | Vehicle Speed Signal |
| 51 | n/a | n/a |
| 52 | Throttle Position Switch (idle) | Throttle Position Switch (idle) |
| 53 | Throttle Valve Position | Throttle Position (angle) |
| 54 | Coding plug | n/a |
| 55 | OBD Signal (K wire) | OBG Signal (K wire) |