If your OBD-II scanner says "No communication" but the ECU has power (pin 80), check the CAN bus. Resistance between pin 15 (CAN Low) and pin 16 (CAN High) should be approximately (due to two 120-ohm terminating resistors in the cluster and ABS module). Open circuit (>100 ohms) means a broken wire.
Bosch ME7.1.1 engine control unit (ECU), commonly used in VAG (Volkswagen, Audi, Bentley) vehicles, uses the following standard pin assignments for bench connections and basic communication: NAT Corporation Main Terminal Connections Power (+12V): (Terminal 15 - Ignition) (Terminal 30 - Permanent Battery) (Secondary +12V for specific VAG versions) Ground (GND): (Terminal 31) (Terminal 31) NAT Corporation Communication Lines NAT Corporation Bench/Programming Signals For tools using universal connectors (like those from Scribd's ECU Guides
Looking at the harness plug (not the ECU), with the locking lever at the top: bosch me711 pinout
Note: Pins not listed are either NC, reserved for automatic transmission (TCU communication), or unused in manual transmission vehicles.
Note: While Bosch maintained a highly standardized power and communication pinout for the ME7.1.1 generation, always verify your specific vehicle wiring diagram before applying power. Bosch ME7.1.1 Bench Flashing Pinout If your OBD-II scanner says "No communication" but
Beyond basic power, these pins control major engine components and receive data from sensors.
When looking at the (female connector) with the locking lever on top: Bosch ME7
| Feature | ME7.1 (rare) | ME7.1.1 (common) | |-------------------------|-------------------|----------------------| | Injector pins | 85-88 only | 82-85 | | Extra 5V sensor supply | No | Yes (pin 60) | | Secondary O2 sensor | Not pinned | Pin 100 | | Electronic throttle | Sometimes cable | Always drive-by-wire |
Connect a wire to your main workbench Ground (GND), adding a 1k-Ohm resistor inline to protect the chip from overcurrent. The Boot Sequence: Leave the ECU completely powered down.