For Bench or OBD communication (using tools like MPPS or PCMtuner), the standard wiring for a Simos 3.3A unit typically includes: : Connects to the main battery supply pins.
For bench connections, the Simos 3.3A generally requires connections to power, ground, and a communication line (K-Line). Note that pin numbers may vary slightly by specific engine code (e.g., AEH or AKL), but standard bench-reading pins typically include: Pin 3 +12V Switched (Ignition): Pin 1 Ground (GND): Pin 2 K-Line (Communication): Pin 43 simos 33a pinout top
The is a foundational engine management system used extensively across the Volkswagen Audi Group (VAG) vehicle lineup. Found commonly in 1.6L 8V MPI engines (such as the AVU and BFQ engine codes) in vehicles like the Volkswagen Jetta, Audi A3, Skoda Octavia, and Seat Leon , mastering its wiring diagram is crucial for bench flashing, diagnostics, and chip tuning. For Bench or OBD communication (using tools like
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If you are diagnosing a "no-start" or "limp mode" condition, check these signals at the ECU plug. Crankshaft Position Sensor (RPM Signal) Pin 60: Camshaft Position Sensor (Hall Signal) Pin 40: Coolant Temperature Sensor (ECT) Pin 33: Intake Air Temperature (IAT) Pin 54: Knock Sensor Signal Pin 12: Throttle Position Sensor (Track 1) Pin 22: Throttle Position Sensor (Track 2) Actuator and Output Pins
This comprehensive technical guide details the critical power, ground, and communication points of the Simos 3.3/33A controller. Core Hardware Architecture Simos 33A controller Go to product viewer dialog for this item.
| Pin | Typical Wire Color | Function | Notes / Conditions | |-----|--------------------|-----------------------------------------------|----------------------------------------------| | 1 | Red/Yellow | Permanent battery voltage (ECU main power) | 30a, fused | | 2 | Brown | ECU ground (main chassis ground) | GND, connects to engine block / chassis | | 3 | Black/Yellow | Ignition switched power (15) | Provides +12V when key is in ON/START | | 4 | - | Not connected | | | 5 | - | Not connected | | | 6 | Grey/Red | Throttle position sensor (TPS) – signal | Linear 0-5V output | | 7 | Brown/Green | Intake air temperature (IAT) – sensor ground | Shared sensor ground | | 8 | Yellow/Black | Engine speed sensor (RPM) – signal positive | Variable reluctance sensor | | 9 | Yellow/Blue | Engine speed sensor – signal negative | | | 10 | Blue/Black | Knock sensor – signal | Shielded wire | | 11 | Green | Injector cylinder 3 – control (ground switch) | Low-side output | | 12 | Grey/White | Injector cylinder 1 – control | | | 13 | Green/Yellow | Fuel pump relay control | Activates relay (ground trigger) | | 14 | Green/White | EGR valve (if equipped) – control | PWM output | | 15 | Black/Green | Secondary air injection relay (if equipped) | Ground trigger | | 16 | White/Green | Ignition coil – cylinder 1 & 4 control | Waste-spark ignition (paired) | | 17 | White/Black | Ignition coil – cylinder 2 & 3 control | Waste-spark ignition (paired) | | 18 | Brown/Yellow | Lambda (O2) sensor – heater ground | Shared sensor return | | 19 | White/Yellow | Lambda (O2) sensor – signal (bank 1) | 0-1V narrowband | | 20 | Blue/White | Coolant temperature sensor – signal | NTC sensor, voltage divider | | 21 | - | Not used | | | 22 | Brown/Red | Engine speed sensor – shield / ground | | | 23 | Blue/Grey | Injector cylinder 4 – control | | | 24 | Brown/Black | Injector cylinder 2 – control | | | 25 | Black/Grey | Idle air control (IAC / idle stepper) – coil A| Bipolar stepper motor | | 26 | Brown/White | IAC – coil B | | | 27 | Black/Blue | IAC – coil C | | | 28 | Brown/Red | IAC – coil D | | | 29 | White/Grey | MAP sensor – signal (if speed-density system) | 0-5V output | | 30 | Brown/Blue | MAP sensor – ground | | | 31 | Yellow/Grey | Oxygen sensor heater – control (ground side) | PWM driven | | 32 | Blue/Yellow | Camshaft position sensor (if equipped) – signal| Used for sequential injection (late SIMOS 33A)|