142
– air influx in the inlet pipe line;
– poor fuel quality;
– failure to meet the maintenance frequency.
The control unit is capable of diagnosing the engine control
unit components to a certain extent.
If a fault is detected, the control unit turns on the diagnostic
fault lamps on the vehicle dashboard, and the code designating
the fault is recorded into its memory.
The engine fault lamp switching on does not mean shutting
the engine immediately, as the control unit has reserve modes
that allow the engine to go on in close to normal conditions.
Nonetheless, when the fault is caused by ignition malfunction-
ing (engine fault lamp
starts to blink) to avoid exhaust
gas neutralizer failure the engine speed should be reduced to
2,500 rpm (motor vehicle speed below 50 km/h) and you should
head for a workshop.
WARNING!
Signal device switches on persistently when the
neutralizer temperature rises above the allowed temperature. In
this case one or two engine injectors will turn off.
The engine operation is only allowed after the fault is eliminated.
Fig. 9.10. Data link connector (XS1):
4 — ground; 6, 14 — Sup-line; 7 — K-line; 16 — +12V
XS1
(front view)
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