Dacia Solenza 2004, Repair Manual

Page: 131 / 891

IGNITION AND INJECTION
17
17 - 37
DF038
PRESENT
OR
MEMORIZED
DOWNSTREAM OXYG EN SENSOR HEATING CIRCUIT
1DEF : Open circuit or short-circuit
CO : open circuit
CC.O : shot circuit at mass
CC.1 : short circuit at + 12 V.
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
Conditions for diagnostic application for memorized failure
:
- Start the engine and ensure that state “ ET03: downstream O2 sensor
heating
” is active wait for an engine fan starting, and then perform a slight
acceleration for one minute.
- Or act upon the actuator control “
AC262: downstream O2 sensor heating ”
* If the failure is memorized with OBD indicator on, check in the context part,
if state “ET288 : Downstream oxygen sensor heating circuit” corresponding
to the OBD indicator lighting request is affirmative. In this case, proceed as
per bellow mentioned method.
RECOMMENDATIONS
Check the connection and the connector state of the oxygen sensor.
Change the connector if necessary.
Check
the heating resistance of the oxygen sensor
.
Refer to chapter ” Help ” in order to compare the resistance-measured value with the recommend ed
one .
Replace the sensor if necessary.
Check the presence of +12 Volts on A pin of the oxygen sensor.
Fix the electric connection between oxygen sensor and the actuators relay, if necessary
Connect the 90 ways terminal box instead of the injection computer
then check the insulation and
continuity on line: :
Pin 65 injection computer > pin B oxygen sensor
Fix if necessary
If the problem is persisting after these checking, fix the other failures then perform the conformity
checking.
Diagnostic – Failures interpretation
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