Grey Connector -> Pin H4 (or the metal casing of the ECU). 3. Communication (CAN Bus)
| Pin No. | Function | Description / Signal | | :--- | :--- | :--- | | | Output Stage Ground | Ground for ignition coils (Critical) | | A02 | Signal Ground | Sensor ground return (MAP, T-MAP, etc.) | | A03 | Battery Voltage (+12V) | Switched power supply (via Main Relay) | | A04 | Ignition Coil 1 | Cylinder 1 trigger signal | | A05 | Ignition Coil 2 | Cylinder 2 trigger signal | | A06 | Ignition Coil 3 | Cylinder 3 trigger signal | | A07 | Ignition Coil 4 | Cylinder 4 trigger signal | | A09 | CAN High | CAN-Bus Communication (High Line) | | A10 | CAN Low | CAN-Bus Communication (Low Line) | | A16 | T-MAP Sensor +5V | 5 Volt supply for Manifold Pressure Sensor | | A17 | T-MAP Signal | Manifold Absolute Pressure Signal | | A20 | Oxygen Sensor Signal | Pre-cat O2 Sensor Signal | | A21 | Oxygen Sensor Ground | Pre-cat O2 Ground | | A27 | Coolant Temp Signal | Engine Coolant Temperature (ECT) Sensor | | A28 | Intake Air Temp Signal | Intake Air Temperature (IAT) Sensor | | A29 | Throttle Position 1 | Potentiometer 1 (Electronic Throttle) | | A30 | Throttle Position 2 | Potentiometer 2 (Electronic Throttle) | | A31 | Throttle Motor + | DC Motor control (positive) | | A32 | Throttle Motor - | DC Motor control (negative) | | A35 | Vehicle Speed | Speed signal from ABS/Transmission | | A39 | K-Line | Diagnostic Line (OBDII Port) | | A42 | Power Steering Pressure | Power steering pressure switch input | | A62 | Accelerator Pedal 1 | Accelerator Pedal Position (APP) Sensor 1 | | A63 | Accelerator Pedal 2 | Accelerator Pedal Position (APP) Sensor 2 | me7.4.5 pinout
The ME7.4.5 uses multiple connectors (often categorized by color or pin count). Key signals on the include: CAN Bus: Pin A3 (CAN High) and Pin A4 (CAN Low). Cooling Fan Control: Pin B1 and Pin C1. Clutch Sensor: Pin D1. Grey Connector -> Pin H4 (or the metal casing of the ECU)
The ME7.4.5 is a "torque-based" ECU, meaning it uses complex calculations between throttle position, airflow (MAF), boost pressure, and ignition timing. If any sensor signal is interrupted or shorted due to incorrect wiring, the ECU will immediately pull timing and limit boost. In short: | Function | Description / Signal | |
Auxiliary Inputs/Outputs
To put the ECU into for reading or writing firmware, specific modifications to the circuit board are often required: