Input signals: Notes
Sensors and functions which are different to previous types are marked in bold text .
| Number | Component | Signal type/explanation |
|---|---|---|
| 3/1 | Ignition switch + 50 supply | Gives information to engine control module (ECM) that engine start is underway. |
| 3/4 | Cruise control lever | Gives information about selected speed to engine control module (ECM) via the electronic throttle module (ETM) to control the throttle. The cruise control software in integrated into the engine control module (ECM). |
| 3/9 | Stop (brake) lamp switch | Informs engine control module (ECM) and electronic throttle module that the car is braking. The signal is a safety feature in addition to the brake pedal sensor.The signal is a safety feature in addition to the brake pedal sensor. The engine control module (ECM) carries out a range test between the signals from both sources. |
| 4/30 4/6 |
ECC MCC |
Provides information if the air conditioning (A/C) is switched on or not. The engine control module (ECM) controls connection/disconnection of the compressor dependent on load, engine speed (RPM), engine coolant temperature etc. |
| 7/6 | Oil pressure switch | Provides information about engine oil pressure. The information is sent on to the Can and Driver information Module which lights the warning lamp. |
| 7/8 | air conditioning (A/C) pressure sensor (linear) | Provides information using a linear signal about any pressure changes on the high-pressure side of the air conditioning (A/C) system Depending on the pressure the engine control module (ECM) can activate the engine cooling fan (FC) at high/low speed and shut off the air conditioning (A/C) compressor. |
| 7/15 | Front heated oxygen sensor (HO2S) (linear signal) | New signal characteristics. Provides information about the oxygen level in the exhaust gases upstream of the catalytic converter. |
| 7/16 | Engine coolant temperature sensor | Provides information about engine coolant temperature (ECT).Located in the thermostat housing on the front edge of the engine. |
| 7/17 | Mass air flow (MAF) sensor(heated wire principle) | Provides information about intake air volume usually under normal conditions. Mass air flow (MAF) has slightly slower cover time at Lambda = 1, therefore complemented by manifold absolute pressure (MAP) (7/81). The heated wire temperature is 200°C (392°F) over intake air temperature. Burning off is not required because of glass encapsulation. |
| 7/21 | Camshaft position (CMP) sensor | New signal characteristics. Provides information about cylinder intake and compression phase.Gives shorter starting time, approximately 0.5 seconds. |
| 7/24 | Knock sensor (1 only) | Provides information if the engine knocks.The engine control module (ECM) knows each cylinders exact position from the new camshaft position (CMP) sensor. Therefore only one knock sensor (KS) is required. |
| 7/25 | Flywheel position sensor | Provides information about the crankshaft position and engine speed (RPM). Flywheel adaptation is active at idle and then takes place at 1000/1500/2000 rpm etc. Due to the segment time overlap, no adaptation is required until TDC which is different compared to M4.4. |
| 7/51 | Accelerator pedal (AP) position sensor | Provides information about current throttle opening.The signal is sent via two separate cables at the same time, one analog signal and one digital signal. |
| 7/53 | Air conditioning (A/C) pressure switch (Pressostat) | Provides information about pressure changes on the low pressure side. |
| 7/73 | Engine coolant level switch | Provides information about engine coolant level. The information is sent further to the Can and Driver information Module which lights the low engine coolant level warning lamp. |
| 7/81 | Manifold absolute pressure sensor MAP | Provides information about the engine load at rapid load changes. Manifold absolute pressure (MAP) sensor is susceptible to air pulses in the intake manifold and is therefore complemented by the Mass air flow (MAF) sensor (7/17). |
| 7/82 | Rear heated oxygen sensor (HO2S) | Provides information about the oxygen level downstream of the catalytic converter (TWC) front section. Compared to previous versions it operates faster and can also affect the fuel/air mix to a greater extent. |
| 7/84 | Fuel tank pressure sensor | Provides information about pressure changes in the fuel tank system. Used for leak diagnostic. |
| 7/95 | Ambient air pressure sensor(located in engine control module (ECM) | Provides information about ambient air pressure. Affects injected fuel quantity at cold start at high altitude and leak diagnostic. |
| 7/105 | Ambient air temperature sensor | Provides information about ambient air temperature. The signal is used switch off the leak diagnostic in cold weather. |
| 7/123 | Clutch pedal position sensor | Provides information that the clutch pedal is depressed. Used in certain markets to connect the so called Interlock function via VGLA which inhibits the starter motor. Also disconnects the cruise control. |
| 7/124 | Brake pedal sensor (located in the brake servo) | Provides information that the brake pedal is depressed for fuel shut off when engine braking. The signal is used to disconnect the cruise control. |
| 20/3 - 20/7 | Ignition coil/power stage for cylinders 1-5 | Provides information about an open circuit/loose connections in the respective ignition coil secondary cable via a parallel cable to the engine control module (ECM). A fault value results in a diagnostic trouble code (DTC) and a lit/flashing malfunction indicator lamp (MIL). |
| CAN | CAN communication | Exchange of information between the engine control module (ECM) and the following units: ABS, TCM, CAN and driver module, electronic throttle module and DLC. |