The value of a verified pinout manifests in three specific scenarios:
The ME20 relies on precise voltage signals to calculate fuel trims.
This layout corresponds to the most commonly encountered ME20 wiring harness with two connectors (A and B). Treat as verified reference but always confirm with meter. Pins shown as numbered per connector shell when viewed from the mating side (wires side), unless otherwise noted. bosch me20 pinout verified
Connector A (often primary; 40-pin typical)
Connector B (secondary; 40-pin typical)
(If your ME20 has different connector sizes/numbering, map pins by function using continuity to known harness points.)
If you want, I can:
| Pin | Function | Verified Status | |------|-------------------------------|------------------| | A1 | Main relay control (output) | ✅ Verified | | A2 | Battery voltage (permanent) | ✅ Verified | | A3 | Ignition switch input | ✅ Verified | | A4 | Sensor ground (ECU reference) | ✅ Verified | | A5 | Engine ground (power stage) | ✅ Verified | | A18 | Crankshaft position sensor (+) | ✅ Verified | | A19 | Crankshaft position sensor (-) | ✅ Verified | | A32 | Camshaft position sensor signal | ✅ Verified | | A33 | Throttle position sensor (wiper) | ✅ Verified | | A40 | Knock sensor 1 | ✅ Verified | | A41 | Knock sensor 2 | ✅ Verified | | A54 | CAN High (diagnostics/immobilizer) | ✅ Verified | | A55 | CAN Low | ✅ Verified |
When verifying pinouts for swapping ECUs: The value of a verified pinout manifests in