Dacia Solenza 2004, Repair Manual

Page: 121 / 891

IGNITION AND INJECTION
17
17 - 27
DF003
PRESENT
OR
MEMORIZED
AIR TEMPERATURE SENSOR CIRCUIT
1. DEF : Open circuit or short-circuit
RECOMMENDATIONS
AFTER
REPARATION
Check the connection and the state of the air temperature sensor connector.
Replace the sensor’s connector if necessary.
Check that resistance of air temperature sensor is not zero or infinite (sensor sure failure).
(Use chapter “Help” in order to compare the measured resistance values compared with
recommended ones).
Replace the air temperature sensor if necessary.
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 77 injection computer > pin 1 air temperature sensor
Pin 49 injection computer > pin 2 air temperature sensor
Fix if necessary
Check the correct evolution of the sensor resistance subject to air temperature .
Replace the air temperature sensor if necessary.
If the problem is persisting after these checking, fix the other failures then perform the conformity
checking.
Diagnostic – Failures interpretation
If failure “DF345 : Supply 5 volts potentiometers or transducers” is present
or memorized, this must be treated with priority.
Conditions for failure detection by the computer:
- Set the contact on
- If the failure is only memorized, start the engine in order to obtain a temperature
variation ( an engine cooling fan starting).
(The failure must pass to the present state, but it may become again memorized
immediately after finishing performing the previous operations).
* If the failure is memorized with OBD indicator on, check in the context part,
if state “ET274 : Air temperature sensor circuit” corresponding to the OBD
indicator lighting request is affirmative. In this case, proceed as per bellow
mentioned method.
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.
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