17B
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33
PETROL INJECTION
Combustion misfire fault finding
L90, and K7J, and 710 – L90, and K7M, and 710
17B
FOR VEHICLES FITTED WITH O.B.D:
The diagnostic can detect, for example:
- a dirty spark plug,
- clogging of the injectors or an injector flow fault,
- a fault in the supply system (pressure regulator, fuel
pump, etc.),
- faulty wiring of the petrol and injection circuits (coil se-
condary, etc),
Fault finding is performed by measuring the instanta-
neous variations in engine rotation speed.
Observation of a drop in torque detects combustion
misfires.
This fault finding is practically continuous while the car
is being driven. If it is not carried out, or if a fault is de-
tected, all other On Board Diagnostic fault finding
This fault finding procedure makes it possible to dia-
gnose two types of fault:
- destructive misfires resulting in destruction of the ca-
talytic converter. These cause the OBD warning light
to light up immediately and flash.
- Polluting combustion misfirings cause the O.B.D. pol-
lution threshold to be exceeded. These cause the
OBD warning light to illuminate if they are detected
during three consecutive journeys.
I -DETECTION CONDITIONS
Before starting, check that programming has been per-
formed. The conditions prior to switching on the ignition
and the current conditions must also be satisfied.
Make sure status:
- ET014 « Cylinder 1 recognition »: « DONE »,
- ET202 « OBD fault finding, misfiring included » :
« ACTIVE ».
Detection is carried out as soon as the coolant tempe-
rature is above 7 5 ˚ C, in three operating ranges
between idle speed and 4,500 rpm.
The test can now be performed by keeping the engine
at idle speed for 11 minutes.
If after the test, the diagnostic tool has detected mis-
firings (see Workshop Repair Manual 390, 17B, Pe-
trol injection, Summary of faults).
II - CONFIRMATION OF REPAIR
Make sure statuses:
- ET014 « Cylinder 1 recognition »: « DONE »,
- ET202 « OBD fault finding, misfiring included »:
« ACTIVE ».
No fault detected and the On Board Diagnostic warning
light is out.
WARNING
At the end of each test, it is essential that the igni-
tion is not switched off before the result is read on
the fault finding tool. Switching off the ignition will
lead to the results being misinterpreted.
Содержание X90
Страница 101: ...12A 7 FUEL MIXTURE Air inlet K7J and 710 12A 1202 1 3 2 1 Air filter unit 2 Throttle valve 3 intake manifold ...
Страница 102: ...12A 8 FUEL MIXTURE Air inlet K7M and 710 12A 1202 1 3 2 1 Air filter unit 2 Throttle valve 3 intake manifold ...
Страница 144: ...16A 12 STARTING LOAD Starter Identification K7J or K7M and 710 16A Engine Starter K7J MITSUBISHI M000T45171ZT K7M ...
Страница 212: ...19B 3 EXHAUST Pipe assembly K7J and 710 19B 109861 1 Cut zone 1 2 Cut zone 2 1 2 ...
Страница 213: ...19B 4 EXHAUST Pipe assembly K7M and 710 19B 109861 1 Cut zone 1 2 Cut zone 2 2 1 ...