Basic elements of a microprocessor control system (Mercedes-Benz S-Class W220)

1 - Right camshaft adjustment solenoid; 2 - Air mixing system pump (AIR); 3 - Mass Air Flow (MAF) Temperature Sensor; 4 - Electronic accelerator/tempostat/idle speed control (EA/CC/ISC); 5 - Intake air temperature sensor (IAT); 6 - Crankshaft Position Sensor (CKP); 7 - Coolant Temperature Sensor (ECT); 8 - Hall effect camshaft sensor; 9 - Left camshaft adjustment solenoid; 10 - Air mixing system pump (AIR) switching valve

1 - Ignition coil #4; 2 - Ignition coil #3; 3 - Ignition coil #2; 4 - Ignition coil #1; 5 - Fuel injectors; 6 - Oil level switch; 7 - Knock sensor 1 (right side of the engine); 8 - Knock sensor 2 (left side of the engine); 9 - Ignition coil #8; 10 - Ignition coil #7; 11 - Ignition coil #6; 12 - Ignition coil #5

1 - Basic module; 2 - Engine control unit ME-SFI; 3 - Control unit box; 4 - Fuel pump relay module; 5 - Air Mixing System (AIR) Relay Module

1A - Left upper flow heated lambda probe (1); 2A - Supply voltage (circuit 87), protected by a fuse; 3A - Grounding; 4A —; 5A - Right upper flow heated lambda probe (1); 6A - Engine cooling/climate control fan control; 7A - Grounding; 8A - Grounding; 1B - Right downstream heated lambda probe (2) (only USA); 2B - Left downstream heated lambda probe (2) (only USA); 3B - Diagnostic connector DLC; 4V - Supply voltage (circuit 30); 1C÷20C —; 21C - Evaporative Evaporative Canister Purge Valve; 22C - Pedal position sensor (+ nominal value potentiometer 1); 23C - Pedal position sensor (- potentiometer nominal value 1); 24C - Pedal Position Sensor (potentiometer nominal value 1 cleaner); 25C - Pedal position sensor (potentiometer nominal value 2 cleaner); 26C - Pedal position sensor (- potentiometer nominal value 2); 27C - Pedal position sensor (+ nominal value potentiometer 2); 28C - AIR system air pump relay module (only USA); 29C - Fuel pump relay module (K27); 30C —; 31C - Grounding of the right upper-flow lambda probe 1; 32C - Right upper flow lambda probe signal 1; 33C - Left upper flow lambda probe signal 1; 34C - Grounding of the left upper-flow lambda probe 1; 35C÷37C —; 38C - Diagnostic connector (engine speed signal); 39C - Diagnostic connector (ME-SFI DTC); 40C - Signal (circuit 50); 1D - Fuel pump relay module (K27); 2D - Carbon adsorber shut-off valve (only USA); 3D - Starter Relay; 4D - Grounding the Fuel Tank Pressure Sensor (only USA); 5D - Fuel tank pressure sensor signal (only USA); 6D - Supply 5V voltage for fuel tank pressure sensor (only USA); 7D - Grounding of the right downstream lambda probe (only USA); 8D - Right downstream lambda probe signal (only USA); 9D - Left downstream lambda probe signal (only USA); 10D - Grounding of the left downstream lambda probe (only USA); 11D - CAN data bus "H"; 12D - CAN data bus "L"; 13D - Variable Speed Control (only without DAS 3); 14D÷15D —; 16D - Collision signal; 17D÷18D —; 19D - Determining the positions of the P/N AT; 20D - Tempostat switch (acceleration/installation) (only without DAS 3); 21D - Tempostat switch (engine braking/installation) (only without DAS 3); 22D - Tempostat switch (return) (only without DAS 3); 23D - Tempostat switch (control contact) (only without DAS 3); 24D - Cruise control switch (off) (only without DAS 3); 1E - Injector cylinder #6; 2E - Injector cylinder #3; 3E - Injector cylinder #7; 4E - Injector cylinder #8; 5E - EGR switch valve; 6E÷9E —; 10E - AIR system air pump switch valve (only USA); 11E —; 12E - Intake manifold resonant valve-switch; 13E - Cylinder 4 Injector; 14E - Cylinder 2 Injector; 15E - Voltage 5V, oil level/temperature/quality sensor; 16E - Grounding of oil level/temperature/quality sensor; 17E - Oil level/temperature/quality sensor signal; 18E÷20E —; 21E - Oil pressure switch signal; 22E - Pressure sensor voltage 5V (only USA); 23E - Pressure sensor signal (only USA); 24E - Pressure sensor grounding (only USA); 25E - Cylinder 1 Injector; 26E - Cylinder 5 Injector; 27E - AIR pump relay in the relay module (only USA); 28E - Coolant Temperature Sensor (ECT) Ground; 29E - Coolant Temperature Sensor (ECT) Signal; 30E —; 31E - Electronic accelerator pedal/cruise control/idle speed stabilization system actuator (EA/CC/ISC) (current value potentiometer 1 wiper); 32E - Electronic gas pedal/cruise control/idle speed stabilization system actuator EA/CC/ISC (actual value potentiometer ground); 33E - Current value potentiometer supply voltage; 34E - Electronic gas pedal/cruise control/idle speed stabilization system actuator EA/CC/ISC (actual value potentiometer 2 ground); 35E÷36E —; 37E - CKP Sensor Grounding; 38E - CKP sensor signal; 39E - Camshaft Hall Effect Sensor Grounding; 40E - Camshaft Hall Effect Sensor Signal; 41E - Knock sensor 1 ground (KS1) (on the right side of the engine); 42E - Knock sensor 1 signal (KS1) (on the right side of the engine); 43E - Grounding of knock sensor 2 (KS2) (on the right side of the engine); 44E - Knock sensor 2 signal (KS2) (on the right side of the engine); 45E - Intake Air Temperature (IAT) Sensor (integrated into film air mass sensor [MAF]); 46E - Supply voltage 5V film sensor MAF; 47E - 5V signal from film MAF sensor; 48E - 5V Film MAF Sensor Ground; 1F - Electronic acceleration/cruise control/idle speed stabilization system actuator (EA/CC/ISC) (-); 2F - Actuator of EA/CC/ISC systems (+); 3F —; 4F - Ignition coil 3rd cylinder T1/3 b; 5F - Ignition coil 3rd cylinder T1/3 a; 6F - Ignition coil 4th cylinder T1/4 a; 7F - Ignition coil 4th cylinder T1/4 b; 8F - Grounding; 9F - Ignition coil 8th cylinder T1/8 b; 10F - Ignition coil of the 8th cylinder T1/8 a; 11F - Ignition coil 7th cylinder T1/7 b; 12F - Ignition coil 7th cylinder T1/7 a; 13F - Ignition coil 5th cylinder T1/5 a; 14F - Ignition coil 5th cylinder T1/5 b; 15F - Grounding; 16F - Ignition coil 6th cylinder T1/6 b; 17F - Ignition coil 6th cylinder T1/6 a; 18F - Ignition coil 2nd cylinder T1/2 b; 19F - Ignition coil 2nd cylinder T1/2 a; 20F - Ignition coil 1st cylinder T1/1 a; 21F - Ignition coil 1st cylinder T1/1 b

Location of the main electrical components in the car