The control unit has memory of damages which works at the included ignition. Information on damages is stored in constant memory which can be cleared after elimination of defects. Other damages remain in additional memory which keeps information even after ignition switching off, but is automatically nulled at turning on of the engine.

Data read-out about damages can be made by means of a light-emitting diode tester.

Digifant control unit

Check of the Digifant control unit carry out in the following order:

Fig. 6.25. A light-emitting diode tester for check of system of ignition KE-Motronic: And — the black socket; In – the brown or white socket; With – the dark blue socket; D–verifying socket; 1–test wires

– prepare a light-emitting diode tester (fig. 6.25) ;

– check integrity of safety locks 15 and 18. Switch off the conditioner and check reliability of fastening of the tire of grounding of a head of the block of cylinders;

– start the engine, and make a trial trip of at least 5 mines, thus turns of the engine there should be not less than 3000 mines-1. During a trip, several times short time press against the stop an accelerator pedal;

– warm up the engine to normal working temperature and let's to the engine work on idling turns. Do not increase engine turns during the subsequent tests;

– if the engine is not started by a starter during 6 with, leave ignition included;

– remove furnish of the lever of gear shifting from the central console. Sockets are placed ahead of the gear shifting lever, under the console;

– connect a tester to contacts of the test socket, except for contact of D. Include ignition and attach wires to contact of D no more than on 4 with;

– count number of flashes of a light-emitting diode tester. Flashes begin a luminescence duration – 2,5 with and a pause proceeding 2,5 with, then impulses follow through 0,5 pages. Count number of flashes of each group of signals and as a result receive number with four figures. If damage is not written down in memory, the code 4444 (four groups on four impulses of flash) will be given out.

Ignition coil

Check of the coil of ignition carry out in the following order:

– disconnect electric wires and uncover the ignition coil;

Fig. 6.17. Check of resistance of a secondary winding of the coil of ignition: 1–ignition coil; 2–the plug of ignition 1 (–); 3–plug 4 (NT); 4–plug 15 (+)

– connect a tester between plugs 1 (–) and 15 (+) (see fig. 6.17 ) and check resistance of primary winding of the coil of ignition;

– connect a tester between plugs 4 (NT) and 15 (+) and check resistance of a secondary winding of the coil of ignition.

Power control unit

Check of the power control unit carry out in the following order:

Fig. 6.26. Tension measurement on contacts 1 and 3 power control units

Fig. 6.27. Arrangement of the power control unit ignition: 1–plug 4; 2–central wire; 3–ignition coil; 4–electric socket; 5–power control unit

– compress fixing uvulas and disconnect from the socket of the power control unit (fig. 6.26) behind the ignition coil the electric tip 4 (fig. 6.27) ;

– include ignition and connect the digital universal measuring device (in a mode of measurement of tension) between two external contacts (1 and 3) on the socket. The device should show tension of the accumulator;

– connect a light-emitting diode tester between contacts 2 and 3 on the socket;

– turn the engine a starter, thus the light-emitting diode should blink. Otherwise, check the Hall sensor;

– switch off ignition and connect the socket;

– disconnect the electric socket from the Hall sensor on the distributor;

– connect the digital universal measuring device (in a mode of measurement of tension) between plugs 1 (–) and 15 (+) on the ignition coil (see fig. 6.17 ) and include ignition;

– using an additional wire, connect the central contact of the electric socket of the sensor of the Hall to "weight". Thus tension should increase to 2 In, then for 1–2 with to decrease to zero;

– if tension does not decrease, establish a new power output block or the block at board, and also check a condition of the coil of ignition.

Hall sensor

Check of the sensor of the Hall carry out in the following order:

PREVENTION Check is necessary only in the absence of an iskroobrazovaniye.

– compress fixing uvulas and disconnect the electric socket from a power output block on the ignition coil;

– connect a light-emitting diode tester to contacts 2 and 3 on the socket;

– turn the engine a starter, thus the light-emitting diode should blink that points to serviceability of the sensor of the Hall;

– if the light-emitting diode does not blink, disconnect the electric socket from the Hall sensor on the distributor, then connect the voltmeter to two external contacts on the socket. At the included ignition the device should show at least 9 In;

– connect the electric socket and remove from it a rubber cover, for access to socket contacts;

– connect a light-emitting diode tester between the central contact on the socket and the positive plug (+) the accumulator;

– turn the engine a starter, thus the light-emitting diode should blink that points to serviceability of the sensor of the Hall. If the luminescence is absent, the sensor of the Hall or the FEI control unit are faulty.

Information dumping from constant memory of damages

Check of the Digifant control unit carry out in the following order:

at the switched-off ignition, disconnect a special wire for tests (see fig. 6.25 );

connect a fork of D and a nest;

include ignition on 4 with and check that the light-emitting diode is shone;

repeat control, attaching approximately on 4 about a fork and a nest. Thus the code 4444 indicating absence of damages and dumping of contents of memory should be highlighted.

Interpretation of codes