Use a multimeter to verify zero resistance between Pin 55 of the ECU and Pin 7 of your OBD2 tool interface.
Using this pinout data requires a careful, methodical approach. Here's a step-by-step guide to help you: bosch me20 pinout verified
If the reading is exactly 5.0V, the ECU internal voltage regulator is functioning. Use a multimeter to verify zero resistance between
She closed the hood and left a tiny tag on the wiring: "ME20 — A1: Batt, A2: GND, B1: IGN, C1/C2: CAN/K." Someone else would decipher the rest, but the car carried on, its story written in circuits and the brief, human care that made it move. She closed the hood and left a tiny
If you'd like to share (e.g., KTAG, KESS, MPPS) or which vehicle this is for, I can help you confirm the exact wiring diagram!
: For those using Drive2 or similar enthusiast guides, "virginizing" the ECU allows it to be programmed to a different vehicle's VIN and immobilizer system as if it were a new unit. Quick Troubleshooting Tips
Disclaimer: Work on vehicle electronics at your own risk. Incorrect wiring can cause permanent damage to the ECU, wiring harness, or sensitive sensors.