Mercedes-Benz Vehicle Communication Software Manual [702kb ...

Data ParametersEngine ParametersAIR LOGIC CHAINRange: __________________________________________________________YES/NOUsed on DM2 systems. This parameter indicates whether the onboard diagnostic secondary airsystem tests have run (YES) or not run (NO).AIR MASSRange: ________________________________________ 0 to 500 kg/h or 0 to 500 mg/SUsed on DM2, EDS, ERE/EVE/ASF (IFI Diesel)), HFM, ME10, ME20 and SIM4 systems. TheECU generates this parameter based on the input signal from the mass airflow sensor. Thereading indicates the mass of the intake air charge in kilograms per hour (kg/h), or milligrams perstroke (mg/S). Values on a warmed-up vehicle vary by system and by engine.Table 5-1 Typical idle readingsSystem Engine Typical Idle Reading4-cylinder8–15 kg/hHFM6-cylinder13–22 kg/h8-cylinder15–25 kg/h12-cylinder12–22 kg/h4-cylinder8–15 kg/hME10 & ME206-cylinder10–20 kg/h8-cylinder12–25 kg/h12-cylinder10–20 kg/hSIM4 — 10–20 kg/hAIR PUMPRange: _________________________________________________ YES/NO or ON/OFFUsed on DM, DM2, HFM, LH, ME10 and ME20 systems. This parameter indicates the state ofthe secondary air pump. The display reads YES or ON when the pump is activated, and readsNO or OFF when the pump is off. Secondary air is pumped into exhaust system to reduceemissions under certain operating conditions. On HFM systems the pump should be on (YES)when engine temperature is below 40°F (4°C).AIR PUMP ACTIVATIONRange: __________________________________________________________ YES/NOUsed on DM2 systems. This parameter indicates whether the ECU has commanded the airpump to activate.AIR PUMP SWITCHOVER VALVEAIR PUMP SWITCHOVER VALVE, LEFTAIR PUMP SWITCHOVER VALVE, RIGHTRange: ____________________________________________________ OPEN/CLOSEDUsed on ME27, ME28 and SIM4 systems. These discrete parameters indicate whether the airpump switch-over solenoid valves are open or closed. At cold start and during warm-up, solenoidvalve should be in OPEN or up position, which directs air pump flow into the exhaust manifold tohelp reduce emissions. With the engine fully warmed up, the solenoid valve should readCLOSED, shutting or closing the air pump chamber to the exhaust manifold.The SIM4 system does not have an air pump, but instead uses the supercharger as an air-pumpduring warm-up. The Recirculating Air Flap actuator is used to direct air into exhaust manifoldand also is used to generate an Air Pump Switchover Valve position status.40