Specifications

Service Training
Section 4.9
Page 9
12.05
4.9.2 ELECTRICAL SYSTEM
4.9.2.1 ELECTRONIC IGNITION SYSTEM
4.9.2.1.1 ELECTRONIC IGNITION SYSTEM UP TO 12/2004
The motor is equipped with a Bosch contactless transistor-coil ignition (TSZ [German abbreviation]) .
Control of the spark ignition without mechanical contact provides the following advantages:
- Ignition electronics and ignition generator work with no wear and consequently need no maintenance
whatsoever.
- The ignition timing can be exactly controlled for all operating conditions of the engine and remains almost
constant throughout the entire service life of the ignition distributor.
- Great ignition reliability at high speed, and optimum power consumption at low speeds as a result of
control of the dwell angle and the absence of contact bounce.
The principal characteristic of this ignition system is the ignition pulse generator, which replaces the cam-
controlled contact breaker. The ignition pulse generator has the job of generating control pulses without
mechanical assistance, i.e. “contactless”. The control pulses are supplied to the electronic switchgear.
The pulses are produced by the induction-type pulse generator in the ignition distributor.
FUNCTIONAL DIAGRAM
Terminal “15” of the ignition lock
A1 = Switchgear
E1 = Ignition distributor with induction-
type pulse generator
E61 = Spark plugs
T1 = Ignition coil