2004 DACIA SUPERNOVA ABS

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 18
DIAG
NOSING-INTERPRETING THE DEFECTS
LACK OF COMMUNICATION WITH THE CALCULATOR
LACK OF
COMMUNICA-
TION
SUGGESTIONS
Try the tester on a different car
Check:
- the connection between the tester and the diagnosing plug (state of the cable)
- the fuse s S3 and S4 in the engine compartment, and S15 in the passenger cabin.
Remedy if necessary.
Check at the diagnosing plug the presence of +12V for pin 16 and the mass for pin 5.
Remedy if necessary.
Connect the 90-way terminal-tester instead of the injection calculator and check the
insulation, the continuity and the absence of parasitic resistances along the following
ci rcu its:
-pin 28 of calc ulator ♦ mass
-pin 33 of calc ulator ♦ mass
-pin 3 of calculator ♦ mass
-pin 56 of calculator ♦ pin 7 of diagnosing plug
-pin 28 of calculator ♦pin 15 of diagnosing plug
-pin 28 of calculator ♦fuse S3 in the engine compartment
-pin 28 of calculator ♦ fuse S4 in the engine compartment.
Remedy if necessary.
AFTER
REPAIR
1.
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 29
DIAG
NOSING-INTERPRETING THE DEFECTS
DEF ECT
PRE SEN TOR
MEMORIZEDINFORMATION ROTATION SENSOR
1. Faulty cogs of the engine flywheel
2. Absence of flywheel signal.
In orde r to do this type of diagnosing, the sensor for atmospheric pressure
mu st not be faulty
Conditions of breakdown detection by the calculator:
-the contact is taken and the dialogue with the calculator is waited for to
be lo st, then the dialogue with the calculator is re-entered and the memo-
rized defec ts are erased
-opera te the starter for 10 seconds or start the engine and keep it in idle
m ode.
Condition of performing the diagnosing:
-defec t is present
-the defect has been memorized but is recorded in the “present” state.
Check the connection and the state of the rotation sensor
Change the connector if necessary.
Check the resistance of rotation sensor.
Remedy rotation sensor if necessary.
Connect the 90-way terminal-tester instead of the calculator and check the insulation, the
continuity and the absence of contact resistance along the circuits:
pin 54 of calculator
♦ pin A of rotation sensor
pin 24 of calculator
♦ pin B of ro tation sensor.
Remedy if necessary.
Check the condition of the cogs of the engine flywheel.
Change the rotation sensor if the incident persists.
The proble m is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an electric shock.
The cause of the destruction must be found before mounting a new
calcul ator.
Er ase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER
R EPAIR
12.
SUGGESTIONS
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 31
DIAG
NOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENTOR
MEMO RIZEDTHE ATMOSPHERIC PRESSURE CIRCUIT
1. Pressure defect of the intake collector.
Conditions of breakdown detection by the calculator:
-the contact is taken, wait for the dialogue with the calculator to be
lost, then resume the dialogue with the calculator.
-run the engine and maintain it at a rotation ration greater than 600
ro t/min for at least 10 seconds.
Conditions of performing the diagnosing:
-defec t is present
-the defect has been memorized but is recorded in the “present” state.
SU G GESTIO N S
If the defect is only present when the engine runs, check the correctness of the clapper
po sition parameters when the acceleration pedal is free, and when it is fully pressed.
Gently press the acceleration pedal (all the way) and check whether the position of the
clapper is co nstantly increasing.
If it is not so, the information is not correct. Treat the diagnose of the clapper potentiometer.
Check the atmospheric pressure sensor.
Remedy atmospheric pressure sensor if necessary.
Check the correct connecting and the condition of the linking tube between the sensor and
the intake gallery.
Connect the 90-way terminal-tester instead of the calculator and check the insulation, the
co ntinuity and the absence of contact resistance along the circuits:
pin 16 of calculator
♦ pin B of the atmospheric pressure sensor
pin 15 of calculator
♦ pin A of the atmospheric pressure sensor
pin 78 of calculator
♦ pin C of the atmospheric pressure sensor.
Remedy if necessary.
Change the atmospheric pressure sensor if the incident persists.
The proble m is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an electric shock.
The cause of the destruction must be found before mounting a new
calcul ator.
15.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER REPA IR
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 32
DIAG
NOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENTIDLE MODE ADJUSTMENT CIRCUIT
Faulty idle mode adjustment
S UGGESTIONS
Check the connection and the condition of the engine step-by-step connector for idle
mode ad justment.
Change the connector if necessary.
Check the resistance of the step-by-step engine.
Change it if necessary.
Check the insulation, the continuity and the absence of contact resistance along the
ci rcu its:
pin 12 of calculator ♦ pin B of step-by-step engine
pin 41 of calculator ♦ pi n A of step-by-step engine
pin 42 of calculator ♦ pin C of step-by-step engine
pin 72 of calculator ♦ pi n D of step-by-step engine.
Remedy if necessary.
The problem is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an electric shock.
The cause of the destruction must be found before mounting a new
calcul ator.
Erase defects memorized by the computer.
Perform the st e ps under “Suggestions” to confirm the re pa i r.
Remedy other possible de f ects.
AFTER REPAIR
16.
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 33
DIAG
NOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENT OR
MEMO RIZEDCIRCUIT OF CLAPPER POTENTIOMETER
Breakdown of clapper position.
Conditions of breakdown detection by the calculator:
-the contac t is set and kept like that for 10 seconds, without press-
ing the acceleration pedal
-d etermine a slow variation in the position of the clapper potenti-
om eter, by slowly operating the acceleration pedal
-keep the pedal pushed to the end for 10 seconds.
Conditions of performing the diagnosing:
-the defe ct is present
-the de fect has b een memorized bu t is recorded in the “present”
state.
S UGGESTIONS
17.
Check the connection and the condition of the clapper potentiometer.
Change the connector if necessary.
Check the resistance of clapper potentiometer (in case there is a certain defect, its value
will be 0 or “infinite”).
Check that the resistance of the clapper potentiometer is in accordance with its variation
cu rve, in keeping with the evolution of the clapper angle all through its operation range.
Check whether the clapper correctly drives the potentiometer.
Remedy or change the clapper potentiometer if necessary.
Connect the 90-way terminal-tester instead of the calculator and check the insulation, the
co ntinuity and the absence of contact resistance along the circuits:
pin 75 of calculator
♦ pin A of clapper potentiometer
pin 74 of calculator
♦ pin B of clapper potentiometer
pin 73 of calculator
♦ pin C of clapper potentiometer.
Remedy if necessary.
The proble m is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an electric shock.
The cause of the destruction must be found before mounting a new
calcul ator.
Er ase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER REPAIR
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 34
DIAG
NOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENTOR
MEMO RIZEDWATER TEMPERATURE SENSOR CIRCUIT
Breakdown of water temperature sensor
Conditions of breakdown detection by the calculator:
-se t the contact
-if the defect is only memorized, start the engine and keep it run till
the first start of the cooling engine ventilator.
Conditions of performing the diagnosing:
-the defe ct is present
-the defect has been memorized but is recorded in the “present” state.
S UGESTIONS
Check the connection and the state of the water temperature sensor
Change the connector if necessary.
Check that the resistance of the water temperature sensor is not 0 or “infinite” (i.e. certain
breakdown of the sensor).
Change the sensor if necessary.
Connect the 90-way terminal-tester instead of the calculator and check the insulation,
the continuity and the absence of contact resistance along the circuits:
pin 73 of calculator
♦ pin B1 of th e water temperature sensor
pin 13 of calculator
♦ pin B2 of th e water temperature sensor.
Remedy if necessary.
Check that the alteration of the resistance of the sensor for various temperatures is in
ke eping with its variation curve.
Change the sensor if necessary.
The problem is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an electric shock.
The cause of the destruction must be found before mounting a new
calcul ator.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER REPAIR
18.
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 35
DIAG
NOSING-INTERPRETING THE DEFECTS
AIR TEMPERATURE SENSOR CIRCUIT
Breakdown of air temperature sensorDEFECT
PR ESENTOR
MEMO RIZED
Conditions of breakdown detection by the calculator:
-se t the contact
-if the defect is only memorized, start the engine and keep it run till
the first start of the cooling engine ventilator.
Conditions of performing the diagnosing:
-defec t is present
-the defect has been memorized but is r ecorded in the “present” state.
SUGGESTIONS
Check the connection and the condition of the air temperature sensor
Change the connector if necessary.
Check that its resistance is not 0 (i..e. certain breakdown).
Remedy the sensor if necessary.
Connect the 90-way terminal-tester instead of the calculator and check the insulation,
the continuity and the absence of contact resistance along the circuits:
pin 77 of calculator
♦ pin 2 of air te mperature sensor
pin 49 of calculator
♦ pin 1 of ai r temperatur e sen sor.
Remedy if necessary.
Check that the alteration of the resistance of the air temperature sensor for various tem-
per atures is in keeping with its variation curve.
The prob lem is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an electric shock.
The cause of the destruction must be found before mounting a new
calcul ator.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.AFTER REPAIR
19.
vnx.su

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 37
DIAG
NOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENTOR
MEMORI ZEDOXYGEN PROBE CIRCUIT
Breakdown of oxygen probe signal
Conditions of breakdown detection by the calculator:
-se t the contact
-start the engine and wait for the enrichment adjustment to be
active for at least 5 minutes.
Conditions of performing the diagnosing:
-defec t is present

-t he de fe ct ha s bee n memoriz ed but is recorded in the “present” stat e .
SUGGESTIONS
Check the connection and the condition of the oxygen probe
Change the connector if necessary.
Check if there is any “false air” caused by cases of lack of watertightness along the
exhau st-probe circuit.
If the ca r has been running a lot out of town proceed to probe-cleaning
Check, after setting the contact, the presence of +12 V at pin A of the oxygen probe.
Remedy if necessary
Connect the 90-way terminal-tester instead of the calculator and check the insulation,
the continuity and the absence of contact resistance along the circuits:
pin 45 of calculator
♦ pin C of ox ygen probe
pin 80 of calculator
♦ pin D of oxygen probe.
Remedy if necessary.
Change the oxygen probe if the incident persists
Th e pr ob lem is not yet solved! Consequently, the injection calculator must be changed.
CAUTION! The destruction of the calculator has probably been caused by an electric shock.
The cause of the destruction must be found before mounting a new
calcul ator.
Er ase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER REPA IR
21.
vnx.su