Dacia Solenza 2004, Repair Manual

Page: 117 / 891

IGNITION AND INJECTION
17
17 - 23
REPARATION CONFIRMATION
Check by means of the CLIP tester, the bellow states, which must have the following configu-
ration:
- ET103: Catalyst diagnostic taken into consideration ------------------------------ ACTIVE
- ET107: Catalyst diagnostic performed ---------------------------------------------- ACTIVE
- no functional failure of the catalyst is detected by the CLIP tester.
The purpose of the oxygen sensor diagnostic is to detect a disturbance leading to exceeding the
OBD step, caused by the HC polluting emissions. Diagnostic is performed by measuring and
comparing the oscillating periods of the values red by the oxygen sensors.
The possible degradations of the oxygen sensors, are of two types:
- mechanical degradation of the electric component (case, wire broke) which is to be de-
fined as electric failure.
- chemical degradation f the component, leading to a retardation of the sensor responding
time, consequently an increase of the minimal/maximal oscillating period.
When the test conditions are accomplished, perform the average of the periods pointed out by
the sensor, retrieving the parasite effects, which are compared with an OBD step average period.
TEST PERFORMING CONDITIONS
Diagnostic of the oxygen sensor can be not performed but after a certain engine running time
and in some specific established operation conditions and if the preliminary conditions, achieved
when setting the contact n, are achieved and preserved:
- no electric failure
- correct performing of the “learnings” by the UCE injection and of the cylinders recognition.
- no detected combustion misfire.
- Non-performing of the oxygen sensor diagnostic after contact setting on.
- water temperature to be over 75°C
Engine Speed Regime Manifold pressure Stabilization period Time before authorization
(Km/h) (rot/min) (mbar) (sec) (min)
Oxygen sensor diagnostic
E7J 63-130 1792-3712 299-799 5 14
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