While some Simos versions support OBD reading, users often report that Simos 3.3 may not work via OBD for full read/write operations, necessitating a full system pinout on the bench.
Siemens Simos 3.3A is an engine management system frequently found in early 2000s Volkswagen Group vehicles, most notably powering the reliable 1.6L 102HP engine (engine code AVU/BFQ) in models like the simos 33a pinout top
| Pin | Signal Name | Function | Typical Color (OEM) | |------|----------------|------------------------------------|------------------------| | | BATT+ | Main battery voltage (30) | Red / Red-Blue | | A2 | BATT+ | Main battery voltage (30) | Red / Red-Blue | | A3 | BATT+ | Main battery voltage (30) | Red | | A4 | GND | Power ground | Brown / Black | | A5 | GND | Power ground | Brown | | A6 | GND | Power ground | Brown | | A7 | 15_IGN | Ignition switched power (15) | Green-Black | | A8 | 87_WU | Relay output (main relay) | Red-Yellow | | B1 | INJ_1 | Injector cylinder 1 | Yellow | | B2 | INJ_2 | Injector cylinder 2 | White | | B3 | INJ_3 | Injector cylinder 3 | Blue | | B4 | INJ_4 | Injector cylinder 4 (if 4-cyl) | Violet | | B5 | IG_A | Ignition coil A (cyl 1 & 4) | Green | | B6 | IG_B | Ignition coil B (cyl 2 & 3) | Green-Yellow | | C1 | O2_11 | Lambda sensor 1, bank 1 (pre-cat) | Black / Gray | | C2 | O2_12 | Lambda heater ground | White / Brown | | C3 | O2_21 | Lambda sensor 2, bank 1 (post-cat) | Gray | | C4 | TPS_5V | Throttle position sensor 5V ref | Orange | | C5 | TPS1_SIG | TPS signal (main) | Orange-Black | | C6 | TPS2_SIG | TPS signal (redundant) | Orange-Red | | D1 | CAN_H | CAN bus (high) | Orange / Yellow | | D2 | CAN_L | CAN bus (low) | Orange / Brown | | D3 | K_LINE | K-line diagnostic (ISO 9141) | Purple | | D4 | CKP_SIG | Crankshaft position sensor signal | Shielded pair (Blue/White) | | D5 | CMP_SIG | Camshaft position sensor signal | Shielded pair (Green/White) | | D6 | ECT_SIG | Engine coolant temperature sensor signal | Brown-Red | While some Simos versions support OBD reading, users