Motronic ME 7.8_40

24 - Motronic

2470 - Motronic Control Module ME 7.8_40







The familiar Motronic ME 7.8 control module is employed as the engine control system. The processor speed has been increased to 40 MHz, with a memory capacity of 1 MB. These enhancements are required on the new models to ensure the enhanced OBD scopes and to facilitate the Sport Chrono function. The Motronic control module is also designed for operation with the LSU wideband Lambda probes upstream of the catalytic converters and for switching the double-flow distribution pipe in the intake system.

Data records for programming the Boxster (987) Motronic control module:

987, EU2, MT5; 987, EU2, MT6; 987, EU2, AT.
987, EU4, MT5; 987, EU4, MT6; 987, EU4, AT.
987, LEV, MT5; 987, LEV, MT6; 987, LEV, AT. (North American)
987, EU4, red.power, MT5; 987, EU4, red.power, MT6; 987, EU4, red.power, AT.

Data records for programming the Motronic control module on the Boxster S (987):

987 S, EU2, MT; 987 S, EU2, AT.
987 S, EU4, MT; 987 S, EU4, AT.
987 S, LEV, MT; 987 S, LEV, AT. (North American)

Enhancement of On-Board Diagnostics OBD (USA) and EOBD







The familiar On-Board Diagnostics system (OBD -> USA) or the European On-Board Diagnostics system (EOBD -> Europe/RoW) for emission monitoring is also used on these vehicles. This system is designed to warn drivers (used worldwide), via an appropriate signal in the instrument cluster, of any emission or engine related faults. Each system is fully compliant with all emission regulations. The Motronic control module can be diagnosed with the PIWIS Tester via the K-line.

- Check engine light is on - Emission related fault
- Check engine light is flashing - Fault liable to damage catalytic converter

There will also be an enhancement to the On-Board Diagnostics systems worldwide for model year 2005. Any occurring faults will be stored with additional information (such as environmental conditions, fault counter and extended fault memory) in the fault memory of the Motronic control module and can be read out with the PIWIS Tester.

The additional scopes required specifically for California standards include:

- More extensive sensor diagnosis
Exhaust-related sensor signals, such as: ambient pressure, ambient temperature, intake air temperature, engine oil temperature, fuel level and vehicle speed must be verified.

- Larger number of fault paths
Each fault type of a signal fault must be stored in a separate fault path.

- Enhanced field monitoring of the vehicle fleet
The function and fault management systems of the diagnostics system must be tested every year on standard production vehicles and documented.

The Motronic ME 7.8_40 control module has been adapted to the engine specific requirements of the following components and systems:
- Electronic throttle
- Sequential fuel injection
- Cylinder-specific knock control
- Static high-voltage system with individual ignition coils
- Load measurement using hot film mass airflow sensor (HFM 5 CL)
- Two-stage resonance intake system
- Switchable double flow intake air distribution pipe
- Stereo Lambda control circuits (LSU wideband Lambda probes upstream of catalytic converter, LSF step probe downstream of catalytic converter
- Lambda probe heating
- 2 parallel three-way catalytic converters, each with pre and main converter
- Secondary air control
- Fuel tank leakage check using excess pressure DM-TL (USA)
- Continuous camshaft position adjustment (VarioCam) using vane adjuster
- Torque coordination for Tiptronic and PSM
- On-Board Diagnosis system for monitoring the exhaust emission control system (OBD II and EOBD)
- Infinite activation of the electronic radiator fans
- Engine compartment scavenging blower
- Air conditioning compressor control
- Cruise control function (via electronic throttle)
- Sport Chrono Package Plus (optional)

The following input signals are available to the Motronic control module:
- Power supply terminal 15, terminal 30, terminal 87 and ground
- Speed transmitters
- Hall transmitter inlet camshaft, bank 1 and bank 2
- Electronic accelerator pedal unit with pedal sensor 1 and 2
- Throttle potentiometers 1 and 2 (in the electronic throttle)
- Hot film mass airflow sensor HFM 5 (load signal and intake air temperature)
- Coolant temperature sensor (NTC)
- Knock sensor, bank 1 and bank 2
- LSU wideband Lambda probes upstream of catalytic converter, bank 1 and bank 2
- LSF Lambda probes downstream of catalytic converter, bank 1 and bank 2
- Oil temperature and oil level
- Oil pressure sensor
- Engine compartment temperature sensor (NTC)
- Tank leakage diagnostics module DM-TL (USA only)
- CAN information
- Brake light switch
- Clutch pedal switch
- Fuel level]
- Vehicle speed
- Environment class
- Immobilizer
- Sport Chrono button (option)

The Motronic control module activates the following actuators:
- Starter controller
- Fuel pump
- Injection valves for cylinders 1 to 6
- Individual ignition coils for cylinders 1 to 6
- Throttle position adjuster (electronic throttle)
- Cruise control (Speed Adjustment System SAS)
- Lambda probe heating
- Valve for intake camshaft adjuster, bank 1 and bank 2
- Switching valve for tuning flap
- Switching valve for double flow intake air distribution pipe
- Tank vent valve
- Tank leakage diagnostics module DM-TL (USA only)
- Secondary air pump
- Cooling water fan right and left (via auxiliary control module)
- Engine compartment scavenging blower
- Cooling water shutoff valve (Tiptronic only)
- Air conditioning compressor relay
- "Check engine" light