Simos 33a Pinout Top New! Direct
: Typically identified by a small dot or a molded "1" near one of the corners of the connector housing. Reading Sequence
CAN bus communication occasionally requires a 120-ohm resistor bridged between CAN-H and CAN-L if your tuning tool doesn't feature a built-in terminator.
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For repair or pinout tracing, group logically:
Tools such as the OBDSTAR DC706 or PCMtuner can read and write both the Flash and EEPROM data in bench mode to clone the ECU or bypass immobilizers. User Experience and Tips simos 33a pinout top
When using any pinout found online, be aware of the following:
For "bench" mode (connecting directly to the ECU pins without the car), you typically need to establish power, ground, and communication. According to standard technical guides for tools like MPPS V18 and PCMtuner , the pin assignments are: Pins 1 , 3 , and 62 GND (Ground): Pin 2 K-Line (Communication): Pin 43
| 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 |
Look for the official VAG (Volkswagen Audi Group) wiring diagrams for the specific vehicle model. For the Audi A3 1.6, a page like "SIMOS Control Module -J361" might provide the official pin arrangement, though it is often behind a paywall. : Typically identified by a small dot or
| ECU | Connector Type | Top Row | Ignition Driver | Common In | |------|----------------|---------|----------------|------------| | Simos 32A | 121-pin | 3 rows | External | Fiat Grande Punto 1.2 | | | 154-pin | 4 rows | External IGBT | Fiat 500, Alfa Mito 1.4 | | Simos 34A | 180-pin | 4 rows (wider) | Integrated | Suzuki Swift 1.6 |
It typically contains a 29F400BB Flash chip and a 93C76 EEPROM .
On most SIMOS 33A ECUs:
Highly documented in tuning communities like ECU Connections , making it easy to troubleshoot or modify. For repair or pinout tracing, group logically: Tools
Many technicians seek this pinout specifically to perform an IMMO off, which is a common fix for older VW vehicles with failing immobilizer systems.
The differs from its siblings:
For certain operations like reading the 29F400 Flash or the 93C76/93C86 EEPROM, you may need to open the ECU. Tools like the DC706 ECU Tool provide specific wiring diagrams for direct board connection to bypass the immobilizer or clone data.
The SIMOS 33A is a 64-pin ECU. It uses (often labeled A, B, and C). However, the common terminology for identifying "top" refers to the main engine harness connector (usually Connector A or T80) or the physical top row of the 64-pin arrangement.