Dacia Solenza 2004, Repair Manual

Page: 128 / 891

IGNITION AND INJECTION
17
17 - 34
UPSTREAM OXYGEN 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.
DF018
PRESENT
OR
MEMORIZED
Conditions for diagnostic application for memorized failure
:
- Start the engine and ensure that state “
AC261: Upstream O2 sensor
heating ” is ACTIVE.
- Or act upon the actuator control “
AC261: upstream 02 sensor heating
”.
In case of failures addition, treat as most important failure
“DF009 actuators
relay control circuit” .
* If the failure is memorized with OBD indicator on, check in the context part,
if state “ET117 : Canister purging control” corresponding to the OBD i
ndicator
lighting request is affirmative. In this case, proceed as per bellow mentioned
method.
RECOMMENDATIONS
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
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 ” for resistance values .
Replace the sensor if necessary.
Check the presence of +12 Volts on A way of the oxygen s ensor .
Fix the electric connection between A way oxygen sensor and the actuators relay.
Connect the 90 ways terminal box instead of the injection computer then
check the insulation, the
continuity and the absence of the parasite resistance on line: :
Pin 63 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.
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