Dacia Solenza 2004, Repair Manual

Page: 138 / 891

IGNITION AND INJECTION
17
17 - 44
DF 057
PRESENT
OR
MEMORIZED
If failure “DF345” : Supply 5 volts potentiometers or sensors” is
present or memorized, this must be treated as most important.
Conditions for diagnostic application to memorized failure:
Set the contact on.
Start the engine, ensure that state “ET030: Upstream oxygen sensor
heating” is ACTIVE and wait that state “
ET037 : Enriching
adjustment ” is ACTIVE, then wait for 5 minutes.
* If the failure is memorized with OBD indicator on, check in the
context part, if state “ET285 : Upstream oxygen sensor circuit” corre-
sponding to the OBD indicator lighting request is affirmative. In this
case, proceed as per bellow mentioned method.
RECOMMENDATIONS
UPSTREAM OXYGEN SENSOR CIRCUIT
1.DEF : Open circuit or short-circuit
Check the
connection and condition
of the oxygen sensor connector
Check if there is no
water penetration in connector
(
a possible cause for engine unstable running
)
Replace the connector if necessary.
Check for lack of tightening
between the exhaust collector and catalyst
If the vehicle is running more in the city, perform a cleaning of the oxygen sensor.
Connect the 90 ways terminal box instead of the injection computer then check the
insulation,
continuity and absence of the parasite resistance on lines:
Pin 45 injection computer > pin C oxygen sensor
Pin 80 injection computer > pin D oxygen sensor
Fix if necessary.
If the problem is persisting, replace the oxygen sensor.
If the problem is persisting after these checking, treat the other failures then perform the conformity
checking.
Perform the operations from ” recommendations” for reparation confirmation.
Fix any other possible failures
Erase the failures memorized by the injection computer.
Perform a conformity checking by means of the CLIP tester.
AFTER
REPARATION
Diagnostic – Failures interpretation
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