33a Pinout Top ~upd~ - Simos

| Pin | Function | Signal Type | Notes | |-----|----------|-------------|-------| | 1 | Ignition coil output (cyl 1) | Output | Low side driver | | 2 | Injector output (cyl 1) | Output | Saturation driver | | 3 | Injector output (cyl 2) | Output | | | 4 | Injector output (cyl 3) | Output | | | 5 | Injector output (cyl 4) | Output | | | 6 | Fuel pump relay control | Output | Grounds relay coil | | 7 | Lambda probe heater (front) | Output | Ground side | | 8 | Throttle valve position sensor (TPS) ground | Sensor Ground | | | 9 | TPS signal (wiper) | Input | 0.5-4.5V | | 10 | TPS 5V supply | Output | +5V reference | | 11 | Intake air temp (IAT) signal | Input | | | 12 | Coolant temp (ECT) signal | Input | | | 13 | MAP sensor signal | Input | Manifold absolute pressure | | 14 | MAP sensor 5V supply | Output | | | 15 | MAP sensor ground | Sensor Ground | | | 16 | Ignition coil output (cyl 2) | Output | | | 17 | Ignition coil output (cyl 3) | Output | | | 18 | Ignition coil output (cyl 4) | Output | | | 19 | +12V main relay output | Power | To sensors/actuators | | 20 | +12V permanent (battery) | Power | Direct from battery | | 21 | +12V from main relay | Power | ECU main supply | | 22 | Ground (power) | Ground | High current | | 23 | Ground (power) | Ground | High current | | 24 | Ground (sensor) | Sensor Ground | | | 25 | CAN High (if equipped) | Comm | Drivetrain CAN | | 26 | CAN Low (if equipped) | Comm | | | 27 | Knock sensor 1 signal | Input | | | 28 | Knock sensor 2 signal | Input | | | 29 | Crank position sensor (CKP) signal | Input | 60-2 wheel | | 30 | CKP sensor ground | Shield/Ground | | | 31 | Cam position sensor (CMP) signal | Input | Hall effect | | 32 | CMP sensor supply | Output | +5V or +12V | | 33 | CMP ground | Ground | | | 34 | Lambda probe signal (front) | Input | 0-1V narrowband | | 35 | Lambda probe ground (front) | Ground | | | 36 | Vehicle speed sensor (VSS) | Input | | | 37 | Brake light switch signal | Input | | | 38 | Clutch switch signal | Input | | | 39 | A/C request signal | Input | | | 40 | A/C compressor enable | Output | | | 41 | EPC warning lamp | Output | | | 42 | Check engine lamp (MIL) | Output | | | 43 | Diagnostic K-line (ISO 9141) | Comm | | | 44 | Idle air control (IAC) - close | Output | Stepper motor coil | | 45 | Idle air control (IAC) - open | Output | Stepper motor coil | | 46 | EVAP purge valve control | Output | | | 47 | Secondary air injection (SAI) relay | Output | | | 48 | Oxygen sensor heater (rear) | Output | If present | | 49 | Idle air control (IAC) - coil B | Output | | | 50 | Idle air control (IAC) - coil A | Output | | | 51 | Not used | - | | | 52 | Not used | - | | | 53 | +12V switched (e.g., from alternator) | Input | Load signal | | 54 | Power ground | Ground | | | 55 | Power ground | Ground | | | 56 | Sensor ground | Ground | | | 57 | Ignition switch input (Terminal 15) | Input | +12V when key ON | | 58 | Start signal (Terminal 50) | Input | +12V during cranking | | 59 | Engine speed output (to tachometer) | Output | Low side driver | | 60 | +12V backup (for adaptive memory) | Power | Permanent |

If you are currently troubleshooting a specific vehicle, let me know the (such as AZL, ALZ, or BMD) or the part number stamped on your Simos casing so I can provide the exact numerical pin assignments for your project. Share public link

For more detailed technical specifications and wiring diagrams, you can consult the SIMOS Injection Guide or the SIMOS 3.4 ALZ System Overview for related architecture. Key Components & Functions simos 33a pinout top

For precise custom wiring maps, verify the internal structural variants via community data archives like the Skoda Fabia Simos 3 Pinout Document on Scribd . Bench Connection Step-by-Step Procedure

┌─────────────────────────────┐ │ │ Row A │ 01 02 03 ... ... ... 14 15 │ (Top/Component side) Row B │ 16 17 18 ... ... ... 29 30 │ Row C │ 31 32 33 ... ... ... 44 45 │ Row D │ 46 47 48 ... ... ... 59 60 │ (Bottom/Solder side) │ │ └─────────────────────────────┘ | Pin | Function | Signal Type |

1 — GND (chassis ground) — ECU ground 2 — CAN High (CAN H) — Powertrain CAN bus high 3 — CAN Low (CAN L) — Powertrain CAN bus low 4 — Battery + (B+) — Permanent battery supply (fused) 5 — Ignition 15 (IGN) — Switched ignition supply 6 — 5V reference — Sensor supply reference 7 — MAP / Boost sensor input — Manifold absolute pressure 8 — IAT / Air temp sensor input — Intake air temperature 9 — CLT / Coolant temp sensor input — Engine coolant temperature 10 — Crankshaft position (CKP) — Primary crank sensor input 11 — Camshaft position (CMP) — Cam sensor input 12 — Knock sensor 1 — Knock input (engine bank-dependent) 13 — Knock sensor 2 — Secondary knock input (if fitted) 14 — Fuel injector 1 driver — Low-side injector driver (cylinder 1) 15 — Fuel injector 2 driver — Low-side injector driver (cylinder 2) 16 — Fuel injector 3 driver — Low-side injector driver (cylinder 3) 17 — Fuel injector 4 driver — Low-side injector driver (cylinder 4) 18 — Fuel pump control (FP relay driver) — Fuel pump relay control (switched output) 19 — Ignition coil driver 1 — Coil driver (or coil pack control) 20 — Ignition coil driver 2 — Coil driver 21 — Ignition coil driver 3 — Coil driver 22 — Ignition coil driver 4 — Coil driver 23 — TPS / Throttle position sensor — Throttle potentiometer input 24 — EGR valve control / N75 — EGR or turbo bypass control (model dependent) 25 — Idle control valve (IAC) — Idle air control / stepper or PWM 26 — Lambda sensor (oxygen) heater control — O2 sensor heater output 27 — Lambda sensor signal (upstream) — O2 sensor voltage input (bank 1) 28 — Secondary lambda / downstream signal — (if fitted) 29 — CAN GND / Chassis reference for CAN — optional/variant 30 — Vehicle speed / VSS — Speedometer/ABS speed signal input 31 — Brake switch input — Brake pedal / cruise inhibit 32 — Clutch switch input — Clutch pedal / cruise inhibit 33 — Neutral / Park switch — Gear selection input (if applicable) 34 — A/C request input — Air conditioning compressor request 35 — Fan control output 1 — Radiator fan relay control 36 — Fan control output 2 — Radiator fan stage 2 37 — Evaporative purge valve control — EVAP canister purge 38 — Ambient air temp input — Ambient temp sensor (if used) 39 — Accelerator pedal position sensor 1 — APS sensor 1 40 — Accelerator pedal position sensor 2 — APS sensor 2 (redundant) 41 — Start inhibit / starter motor input — Cranking detection input 42 — Immobilizer / PATS input — Immobilizer transponder data line 43 — Serial data / K-line (diagnostic) — Older K-line diagnostic port 44 — LIN bus / secondary serial — Variant-dependent 45 — CAN 2 High / FlexRay (variant) — Secondary bus high (if present) 46 — CAN 2 Low / FlexRay (variant) — Secondary bus low (if present) 47 — Alternator sense / L-terminal — Charge warning / alternator field sense 48 — Fuel rail pressure sensor — Fuel pressure sensor input (if fitted) 49 — Turbocharger control (VNT / boost) — Boost control solenoid driver 50 — Secondary injector drivers / spare outputs — Variant-dependent 51 — Knock ground / sensor ground — Dedicated sensor ground 52 — Switched supply for sensors (IGN2) — Secondary switched supply 53 — Ground (battery negative) — Main ground return 54 — Reserved / manufacturer test pin — DO NOT CONNECT 55 — Reserved / manufacturer test pin — DO NOT CONNECT

To connect a universal flashing tool to the Simos 33A top pins on your workbench, follow these baseline steps: 14 15 │ (Top/Component side) Row B │ 16 17 18

The pinout for the Siemens Simos 3.3a ECU , commonly found in VAG (Volkswagen, Audi, Seat, Skoda) vehicles with 1.6L engines (like the AVU or BFQ codes), is essential for bench reading, pincode retrieval, and IMMO-OFF procedures. Core Bench Pinout (Power & Communication) For standard "on-the-bench" operations using tools like OBDSTAR DC706 , the primary connections are made to the 81-pin main connector Pin Number(s) Description +12V (Permanent) Main power supply +12V (Ignition) Switched power Ground (GND) Main chassis ground Diagnostic communication line Component-Specific Pinout Data