UAZ HUNTER 315148, Operating Manual, Page: 62 / 136

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- unscrew nut 7 and take cover 1 with the filter cartridge 5
out of the filter housing;
- unscrew nut 6 and remove the filter cartridge;
- place in the new filter cartridge, re-assemble and re-install
the air filter.
A filter with damaged sealing gasket 2 must not be operated.
fuel supply and ignition control system
To connect engine control system of automated external
diagnostics and programming devices, a data link connector
covered with protective lid is installed under the hood on the
front body panel (Fig. 9.10).
The control unit is installed in the vehicle's interior on the
passenger side to the right on the side wall under the decorative
board.
Diagnostics
Operation of the engine control system and the injection
system depends on the conditions of the mechanical and hydro-
mechanical systems. Several deviations leading to faults can be
mistaken for electronic control system malfunctions, such as:
- low compression;
- deviation of gas distribution phases caused by an incorrect
assembly of engine components;
- air ingress into the inlet and the outlet pipelines;
- poor fuel quality;
- failure to meet the maintenance schedule.
The control unit is capable, to a certain extent, of diagnosing
engine control unit components.
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 malfunction lamp switching on shall not mean
the engine must be stopped immediately, since the control unit
has backup modes allowing the engine to work under conditions
close to normal.
Fig. 9.10. Data link connector (XS1):
4 — ground; 7 — K-line external diag-
nostics; 16 — +12V