Constant +12V direct from the battery. Keeps ECU memory alive. Terminal 15 Switched +12V from the ignition switch. Wakes up the ECU. Kl. 31 Terminal 31 Main Chassis Ground. Kl. 87 Terminal 87 Power output from the Main ECU Relay back into the ECU. CAN-H / CAN-L Controller Area Network High and Low communication wires for vehicle networking. K-Line (ISO 9141) Diagnostic Line Serial communication line for older diagnostic scanners. 5V OUT Sensor Reference Regulated 5V output sent to power engine sensors. KNK1 / KNK2 Knock Sensor Shielded input lines monitoring engine detonation. 5. Applications: Why Do You Need a Pinout Datasheet? Bench Flashing and ECU Cloning
A typical datasheet is organized to provide a map between the ECU's physical pins and the vehicle's wiring harness: uml.edu.ni ECU Identification : Includes the model number (typically starting with for Bosch units) and the hardware/software version. Connector Layout Bosch Ecu Pinout Datasheet
: Each pin is assigned a sequential number (e.g., 1 to 94) to prevent incorrect wiring. Terminal Designations : Standardized automotive labels such as: : Permanent battery positive (+12V). : Ignition-switched positive. : Ground (GND). CAN High/Low : Digital communication lines. : Diagnostic communication line. Common Bosch ECU Pinout Examples Engine Control Unit | Repair & Preexchange Offers Constant +12V direct from the battery
| ECU Pin | Signal Name | Type | Target Component | Wire Color (Factory) | |---------|-------------|------|------------------|----------------------| | T121/12 | CKP Sensor + | Analog input | G28 Crank sensor | Black/Blue | | T121/13 | CKP Sensor - | Analog return | G28 Crank sensor | Black/Grey | | T94/3 | Fuel Pump Relay | Low-side driver | J17 Relay coil | Green/Yellow | | T60/1 | Permanent +12V | Power | Battery | Red | | T60/2 | Switched +12V (Terminal 15) | Power | Ignition switch | Black/Red | | T60/4 | Main Ground | Ground | Chassis | Brown | Wakes up the ECU