2004 DACIA SUPERNOVA ABS

E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 38
DIAG
NOSING-INTERPRETING THE DEFECTS
OXYGEN PROBE HEATING CIRCUIT
1. Short-circuit at 12 V along the way to pin 63 of calculator (heating oxygen probe command)
2. Short-circuit at mass along the way to pin 63 of calculator (heating oxygen probe command)
3. Open circuit at 12 V along the way to pin 63 of calculator (heating oxygen probe command)
4. Breakdown of the probe fuse heating power.
DEFECT
PR ESENT OR
MEMO RIZED
Conditions of breakdown detection by the calculator:
-start the engine
Conditions of performing the diagnosing:
-defec t is present

-t he def ec t has been memor ized but is rec orded i n t he “pr es e nt ” s t at e.
SUGGESTIONS
Check the connection and the condition of the oxygen probe connector
Change the connector if necessary.
Check the heating resistance of the oxygen probe.
Change the oxygen probe if necessary.
Check the presence of +12V at pin A of the oxygen probe.
Remedy the electric circuit up to the actuating relay 238 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 circuit:
pin 63 of calculator −> pin B of the oxygen probe.
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.
22.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER REPAIR
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 39
DIAG
NOSING-INTERPRETING THE DEFECTS
DETONATION SENSOR CIRCUIT
Breakdown of detonation signalDEFECT
PR ESENT OR
MEMORI ZED23.
Condition of breakdown detection by the calculator:
-do a route-test, with the engine heated and under high rotation
ra tio.
Condition of performing the diagnosing:
-the defe ct is present
-the defect has been memorized but is re corded in the “present” state.
SUGGESTIONS
Check the connection and the condition of the detonation sensor
Change the connector if necessary.
Check the mounting of the detonation sensor on the engine block.
Tighten to the couple the detonation sensor.
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 20 of calculator -> pin 1 of detonation sensor
pin 79 of calculator -> pin 2 of detonation sensor
pin 79 of calculator -> detonation sensor screening.
Remedy if necessary.
If the incident persists, change the detonation sensor.
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.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.AFTER
REPAIR
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 40
DIAG
NOSING-INTERPRETING THE DEFECTS
DEFECT
PRESENTOR
MEMO RIZEDCAR SPEED INFORMATION
Car speed breakdown
Conditions of breakdown detection by the calculator:
-do a rou te-test, watching the car speed
-continue the route-test running at constant speed
-continue the route-test, running up-hill with the engine in idle
m ode.
Conditions of performing the diagnosing:
-defec t is present

-t he de fe ct ha s bee n memoriz ed but is re cor ded i n t he “pr es en t ” s t at e.
SUGGESTIONS
Check the connection and the condition of the connectors along the way to the speed
translator.
Change the connectors 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 circuit:
pin 53 of ca lculator -> pin 1 of speed translator.
Remedy if necessary.
If the incident persists, change the speed translator and the mileage cable.
24.
Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.
AFTER
R EPAIR
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 46
DIAG
NOSING-INTERPRETING THE DEFECTS
FUNCTIONAL BREAKDOWN OF THE OXYGEN PROBE
La ck of coherence of the information received from the oxygen probe.DEFECT
PR ESENT OR
MEMORI ZED30.
Note down other functional defects.
Erase the defec ts memorized by the calculator.
Remedy other possible defects.AFTER
R EPAIR
Check that there is no “false air” caused by the lack of watertightness along the exhaust
circu it up to the oxygen probe
Remedy if necessary.
If the car ha s been running for a long while in town, clean the oxygen probe.
Check the connection and the condition of the oxygen probe connector.
Change connector if necessary.
Check the heating resistance of the oxygen probe.
Change oxygen probe if necessary.
Check, after setting the contact, the presence of +12V (after the actuating realy) 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 c alculator
♦ pin C of oxyg en probe
pin 80 of calc ulat or
♦ pin D of 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 circuit:
pin 63 of calculator
® pin B of oxygen probe.
Remedy if necessary.
If the incident persists, replace the oxygen probe.
SUGGESTIONS
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 52
DIAGNOSING-CON
FORMITY TEST
Pressure circuitParameter: Collector pres-
sure
Parameter: Atmospheric
pressure 290 < X < 370 mbar
X=Atmos
pheric
pressureIf further problems
arise, refer to the
di agnosing of those
p arameters9.
Parameter: Detonation sig-
nal 30 < X < 70
If
further problems
arise, refer to the
di agnosing of that
p arameter
Anti-detonation
circuit
10.
LIST OF STÃTES
LIST OF PARAMETERS
Enrichment
adjustment
Stat
e: enrichme nt adjustment
Parameter: tension of oxygen
probe
Parameter: enrichme nt ad-
justm ent correction Confirmed state
20mV 0 A verage = 128 If
further problems
arise, refer to the
di agnosing of that
state
Stat e: Air-conditioning re-
quirement
Stat e: Accelerated idle mode
Stat e: AC compressor
Parameter: en g i ne ro t ation ratio
Parameter: power absor bed
by AC compressor
State: Ai r-condit ioning requirment
State: Accelerated idle mode
Stat e: AC compressor
Para meter: en gine ro t ation ratio
Para meter: power ab s o rbed by
AC co mp res sor Confi rmed state
Lig ht indicat or is on
when AC co mman ds
co upling of co mpres -
sor
Confi rmed state
Lig ht indicat or is on
when accel erated idle
mo d e is active
Confi rmed state
Lig ht indicat or is on
when injection au tho-
ri zes co u pling of co m-
pressor
75
0 3 00 Not co nfirmed sta te
Confi rmed state
Not co nfirmed sta te
If th e injection does
not auth ori ze co upling
of compres sor
75 0 X<25 0 W
Confi rmed state
Ventilator must have
low rotation ratio
Sta te: Low sp eed ven tilat or
If further problems
arise, refer to the
di agnosing of those
states
11.
12.
Air-conditioning
(board-com-
m
anded AC)
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 60
DIAG
NOSING-INTERPRETING THE STATES
Remark:
The testing of the battery and the charging circuit can be done with “TECHNIC CLIP”
an d does not require disconnecting the battery, so it allow the conservation of the calculator
memory.
AFTER REPAIRPerform again the conformity test.
PA RAM ETER
CLAPPER POSITION
MEMORIZED VALUE FOR
FREE POSITION OF ACCELERATION PEDAL
SUGGESTIONSNo defect should be present or memorized.
The contact is set or the engine is started.
The value is
memorized at limit
or fa ilure to detect
the free pedal
po sition, or failure to
detect the completely
pushed down
position Check if the mechanic limitation of the potentiometer has been
a
ltered.
Check the command of the acceleration (friction, obstacles).
Check the resistance of the clapper potentiometer.
Change potentiometer if necessary.
Check the insulation, the continuity and the absence of contact
re sistance along the circuits:
pin 43 of calculator ♦ pin C of clapper potentiometer
pin 74 of calculator ♦ pin B of clapper potentiometer
pin 75 of calculator ♦ pin A of clappe r p otentiometer.
Remedy if necessary.
Th e po sition, of the
clapper is fixed
Check the resistance of the clapper potentiometer during the
operation of the clapper.
If the resistance varies, check the electric circuits connected to
the potentiometer.
If the resistance does not vary, check if the potentiometer is
mechanica lly coupled to the clapper.
Change the potentiometer if necessary.
AFTER REPAIRPerform again the conformity test.
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 61
DIAG
NOSING-INTERPRETING THE STATES
PARAM ETERWATER TEMPERATURE
SUGGESTIONSNo defect should be present or memorized
If the value read is not real, check if the sensor for water temperature correctly follows the
“standard curve of the resistance according to temperature”.
Replace sensor if there are deviations.
REMARK: a sensor displaying deviations regarding the normal evolution of its param
eter s has previously undergone an electric shock.
Check the insulation, the continuity and the absence of contact resistance along the circuits:
pin 13 of calculator
♦ pin B2 of water temperature sensor
pin 73 of calculator
♦ pin B1 of wa ter temperature sensor.
Remedy if necessary.
AFTER REPAIR Perform again the conformity test.
SUGGESTIONS No defect should be present or memorized PA R A METER
AIR TEMPERATURE
If the va lue read is not real, check if the sensor for air temperature correctly follows the
“ standard curve of the resistance according to temperature”.
Replace sensor if there are deviations.
REMARK: a sensor displaying deviations regarding the normal evolution of its param
eter s has previously undergone an electric shock.
Check the insulation, the continuity and the absence of contact resistance along the circuits:
pin 49 of calculator
♦ pin 1 of air te mperature sensor
pin 73 of calculator
♦ pin 2 of ai r temperature sensor.
Remedy if necessary.
AFTER REPAIR Perform again the conformity test.
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E7J-A-2/60 ENGINE17
IGNITION AND INJECTION
17 - 62
DIAG
NOSING-INTERPRETING THE STATES
PARAM ETERCOLLECTOR PRESSURE
ATMOSPHERIC PRESSURE
Check the insulation, the continuity and the absence of contact
resistance along the circuits:
pin 15 of calculator
♦ pin A of atmo spheric pressure sensor
pin 16 of calculator
♦ pin B of atmo spheric pressure sensor
pin 78 of calculator
♦ pin C of atmo spheric pressure sensor.
Remedy if necessary.
If all the above are correct, replace the atmospheric pressure
sensor
SUGGESTIONSNo defect should be present or memorized
Collector pressure not
r eal after setting
contact.
Co llector pres s ure <
Min. in idle mode.
Atmospheric pressure
not r eal
Check:
- watertightness of tube between the atmospheric pressure sensor
and the intake collector
- adju stment of rocker-arms
- canister draining valve, which should be closed in idle mood
- cy linder compression, controlled with “CLIP TEHNIC”
If all the above are correct, replace the atmospheric pressure sen-
sor
Collector pressure <
Max. in idle mode.
Perform again the conformity test.
AFTER REPAIR
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