UAZ PATRIOT Operation Manual page 126

Engine control system and diagnostics thereof
The main component of the system carrying out the control
process is the microprocessor based control unit. The control
unit issues the control signals based upon the data acquired from
the sensors of the system monitoring the state of the engine, the
motor vehicle and environment. The control unit is installed in
the motor vehicle cab to the right on the front bodywork panel.
To connect the engine control system automated external
diagnostics and programming engine control devices, a diagnostic
data link connector is installed under assembly block cap on the
assembly block bodywork panel (Fig. 9.19).
Control unit performs a certain amount of engine control
system components diagnostics. When a malfunction is detected,
the control unit switches on malfunction signalling lamps
and on the vehicle dashboard. Malfunction is recorded in
its memory.
ATTeNTION! When the "EDC" fault signalling lamp is on
flashing, the engine may not be operated. Stop the motor vehicle
as soon as possible and shut of the engine. The motor vehicle may
only be operated after the fault is eliminated.
When the "OBD" engine fault signalling lamp is constantly on,
the engine components or the exhaust system components affecting
the exhaust gas toxicity are faulty. If the signalling lamp is on and
no significant deterioration of ride performance is observed, you
can continue motion at low speed to the nearest UAZ authorized
service station to seek diagnostics.
Long-term operation with the signalling lamp constantly on can
lead to failure of the engine control system components.
XS1
(Front view)
126
Fig. 9.19. Data link
connector (XS1):
4, 5 — weight;
7 — K-line;
16 — +12V