Dacia Solenza (engine E7J). Manual - part 29

IGNITION AND INJECTION

17 - 22

The purpose of the catalyst diagnostic is the detection of the disturbances leading to exceeding

an OBD step due to HC pollution emissions.
The catalyst storage capacity of the oxygen is the indicator of its condition. When the catalyst is
beginning to ”age”, the storage capacity of the oxygen is diminishing, in the same time with the
diminishing of the treatment capacity of the pollution gases.

IMPOSED CONDITIONS FOR DIAGNOSTIC STARTING

The catalyst diagnostic can be not performed but after a certain time of engine operation and

only if the preliminary conditions, when setting the contact on, are accomplished and preserved:

- no electric failure
- cylinder’s recognition performed
- no detected combustion misfire.
- non-performing of the catalyst diagnostic after contact setting on.
- correct performing of the “learnings” by the UCE injection.
- water temperature to be over 75°C

Catalyst diagnostic

Engine Speed

Regime

Manifold pressure

Stabilization period Time before authorization

(Km/h)

(rot/min)

(mbar)

(sec)

(min)

E7J

63-130

1792-4000

430-739

FAILURES DETECTION

The diagnostic is to be performed on a stabilized range in the fifth gear, at the speed of 70 Km/h.

When the diagnostic starting conditions are accomplished, excitation peaks are applied, which is
leading to the oxygen bubbles sending to the catalyst. If the catalyst is good, it will absorb the
oxygen and the tension of the downstream oxygen sensor will remain at an average value. If the
catalyst is used, it will reject the oxygen and the oxygen sensor will wrongly define the phenom-
enon. The oxygen sensor tension will fluctuate. If the failures is three consecutively times con-
firmed, the OBD indicator would be on.
The test duration will be not exceeding 52 seconds.

ATTENTION: after performing this test, the contact setting on is imposed (key in M

position) before reading the results by means of the CLIP tester. Any contact setting off
before reading the test results, will lead to their wrong interpretation.

If after test performing, the CLIP tester is noticing the presence of the combustion mis-

fires, refer to the diagnostic method related to this symptom.

IGNITION AND INJECTION

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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

IGNITION AND INJECTION

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FAILURES DETECTION

This diagnostic is to be performed when driving in the fourth or fifth gear, at constant speed

(about 70 Km/h) and for a period of minimum 60 seconds.

Oxygen sensor diagnostic

Engine

Gearbox ratio

Speed

Maximum period

(Km/h)

(sec)

E7J

63-130

For the accomplishment of this test, during all its running period, UCE injection is inhibiting the

control function of the canister purging valve. UCE injection will issue the recommendation
” Oxygen sensors diagnostic taken into consideration”.

ATTENTION: after performing this test, the contact setting on is imposed (key in M

position) before reading the results by means of the CLIP tester. Any contact setting off
before reading the test results, will lead to their wrong interpretation.

If after test performing, the CLIP tester is noticing a failure of the oxygen sensor, refer to

the diagnostic method related to this symptom.

REPARATION PERFORMING CONFIRMATION

Check by means of the CLIP tester, the bellow states, which must have the following configu-

ration:

- ET102: Sensors diagnostic taken into consideration ------------------------ ACTIVE
- ET106: Sensors diagnostic performed --------------------------------------- ACTIVE
- no catalyst failure is detected by the CLIP tester and the OBD indicator is off.(mbar).

IGNITION AND INJECTION

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Diagnostic – General

This document is presenting the diagnostic for the injection computers SIRIUS 32, which have

nr.program E1 and Diag.variant 10.
In order to perform the diagnostic of this injection system, it is necessary to use the following
elements:

- Diagnostic Technical Note
- Functional electric diagram of the respective vehicle
- CLIP technical tester, 90 ways terminal (ELE 1497).

DIAGNOSTIC PERFORMING STEPS

- CLIP tester connection to the diagnostic socket for identification of the SIRIUS 32 computer

type, of the “E1” program and the diagnostic variant “10”.

- Information identification in the document “Diagnostic” corresponding to the injection system.
- Reading and observing of the working instructions presented in the diagnostic documentation.
- Reading of the failures memorized by the injection computer, by means of the CLIP tester and

causes identification by means of chapter “ Failures interpretation”

DO NOT ERASE THE MEMORIZED FAILURES BEFORE READING THEM BY

MEANS OF THE CLIP TESTER

Write the memorized failures, after having previously red by means of the CLIP tester, in order

to be taken into consideration and treated, if these are to be themselves erased.

1. Treat all existent failures.

2. Memorized failures:

Perform the operations mentioned in “Recommendations” corresponding to each failure, in order
to confirm the failure.
If the failure is becoming present, then it must be treated.

3. For vehicle provided with OBD.

If the failure is memorized and the OBD indicator is on, read the failure context remarks, the
corresponding state at” OBD indicator lighting requesting”, in order to establish if this is the cause
for indicator lighting.
In such case, treat the failure as being present.

REMARK: the state “ OBD indicator lighting requesting” may be YES or NO and may be

consulted by selecting menu “ FUNCTIONS”, then OBD INDICATOR LIGHTING”.

Perform the conformity checking (evidencing of eventually disturbances not yet declared by the

system self-diagnostic).

Validate the reparation performing (failure cause elimination).
Take benefit of the information from the failure-locating tree, in case the problem is persisting.

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