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A34 | Gasoline injection components
Bosch Automotive Aftermarket 2008 | 2009
Electronic control units
Systems:
Jetronic and Motronic
Purpose:
The electronic control unit determines the quantity of fuel required in each case and regulates
all the connected actuators and injectors. This is implemented on the basis of the signals from
the temperature, pressure and load-detection sensors. Electronic control units for Motronic
systems also control the ignition point. In modern systems, the ECU also assumes diagnosis
functions. Faults occurring are stored in the fault memory and can be read out using self-
diagnosis testers.
Note:
Electronic control units in vehicles with immobilizer sometimes have to be “taught”. This work
can only be performed in specially equipped workshops.
Part number:
0 261 20. ... (Motronic), 0 280 00. ... (L/LH-Jetronic), 0 280 800 ... (KE-Jetronic/Motronic)
Fuel accumulator
Systems:
K, KE-Jetronic, KE-Motronic
Purpose:
The fuel accumulator keeps the fuel-supply system pressurized after shutting off the engine.
This considerably enhances starting performance, particularly with a hot engine. The accumula-
tor also has a sound-absorbing effect.
Part number:
0 438 170 ...
Fuel distributor
Systems:
K, KE-Jetronic, KE-Motronic
Purpose:
The fuel distributor and the air-flow sensor together form the mixture-control unit. The two
components are available separately and must be replaced separately. The fuel distributor’s
control plunger is deflected by the air-flow sensor’s lever system. The fuel distributor meters
the quantity of fuel to be injected to each cylinder.
Note:
Note: The fuel distributor can only be replaced as a complete unit. It cannot be assembled
using workshop equipment after removing individual components.
Part number:
0 438 100 ..., 0 438 101 ..., T 026 TX2 ...,
BX: 0 986 438 ...