Dacia SuperNova (engine E7J). Instruction - page 34

E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 46

DIAGNOSING-INTERPRETING THE DEFECTS

FUNCTIONAL BREAKDOWN OF THE OXYGEN PROBE

Lack of coherence of the information received from the oxygen probe.

DEFECT
PRESENT OR
MEMORIZED

30.

Note down other functional defects.
Erase the defects memorized by the calculator.
Remedy other possible defects.

AFTER
REPAIR

Check that there is no “false air” caused by the lack of watertightness along the exhaust
circuit up to the oxygen probe
Remedy if necessary.

If the car has 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 oxygen probe

pin 80 of calculator

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

E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 47

DIAGNOSING-INTERPRETING THE DEFECTS

POLLUTING COMBUSTION MISFIRE
DESTRUCTIVE COMBUSTION MISFIRE
1. Combustion misfire during the last running done
2. Confirmed combustion misfire.

DEFECT
PRESENT

Combustion misfire at cylinder 1
Combustion misfire at cylinder 2
Combustion misfire at cylinder 3
Combustion misfire at cylinder 4.
Furnishes information concerning the nature and location of breakdown.

SUGGESTIONS

31.

Connect the tester and select “Test of ignition”.
Watch the indications and replace the necessary parts.

Connect the tester and select “Test of compression”.
Watch the indications and replace the necessary parts.

Connect the tester and check the cogs of the flywheel.
Remedy if necessary.

If no defect is found out, then there is a problem with the fuel-supply circuit. You must
check:
-petrol filter
-flow and pressure of fuel
-condition of petrol pump
-if there are impurities inside the tank
-condition of injectors.
Remedy the elements of the fuel-supply circuit that are faulty.

Note down other functional defects.
Erase the defects memorized by the calculator.
Remedy other possible defects.

AFTER REPAIR

E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 48

DIAGNOSING-INTERPRETING THE DEFECTS

COMBUSTION MISFIRE AT CYLINDER 1
COMBUSTION MISFIRE AT CYLINDER 2
COMBUSTION MISFIRE AT CYLINDER 3
COMBUSTION MISFIRE AT CYLINDER 4

It must be said that in infrequent cases the indication of the faulty cylin-
der is not exact; the calculator can declare cylinder 1 as not working,
while it is not faulty. So, you have to check this cylinder as a priority,
and if everything s correct, the other cylinders will be checked. These
indications will only be used if the polluting or destructive combustion
misfires are present.

SUGGESTION

In this case, the problem is probably caused by an element which acts
only on this cylinder:
-its injector
-the spark plug of this cylinder
-the plug of the spark for that cylinder.

CYLINDER 1 IS

DECLARED

FAULTY

32.

In this case, the problem is probably caused by an element which acts
only on this couple of cylinders (1 and 4 or 2 and 3):
-the high-tension part of the ignition coil for cylinders 1 and 4 or for
cylinder 2 and 3
-the command part of the ignition coil for cylinders 1 and 4 or for
cylinder 2 and 3.

CYLINDERS 1

AND 4 OR

CYLINDERS 2

AND 3 ARE

DECLARED

FAULTY

FOUR
CYLINDERS
ARE
DECLARED
FAULTY

In this case, the problem is probably caused by an element which
acts on all the cylinders:
-the petrol filter
-the petrol pump
-the quality of the petrol.

E7J-A-2/60 ENGINE

17

IGNITION AND INJECTION

17 - 49

DIAGNOSING-CONFORMITY TEST

Finally, the testing of the various states and parameters of the system will be done,

in the following situations:

A - With the stopped engine, and with contact set
B - With the hot engine, in idle mode, without consumers
C - During a route test.

LIST OF STATES

Nr.
crt:

Characteristics

1.

State: +After Contact to calculator
Parameter: Supply voltage of
injection calculator
Actuating relay command

State: Connection for AC

State: Configuration with anti-
starter
State: Connection with speed
translator

State: Anti-starter

Acceleration pedal let free
State:
position of clapper when the
acceleration pedal is raised
Parameter: position of clapper
Parameter: Memorized value for
the position when the pedal is raised
Acceleration pedal slightly pushed
State:
position of clapper when ac-
celeration pedal is raised
State: position of clapper when ac-
celerat io n ped al is comp letel y
pushed
Acceleration pedal completely
pushed
State:
position of clapper when ac-
celerat io n ped al is comp letel y
pushed
Parameter: position of clapper

Function

Battery
voltage

2.

I

njection

calculator
configura-
tion

3.

Anti-starter

4.

SUGGESTIONS

A- With the stopped engine, and with contact set

Visualizing and

Remarks

Confirmed state

11.8V<X<13.2V

Confirmed state
if the car is
equipped with

AC

Confirmed state

Confirmed state

Not confirmed

state

Confirmed state

0<X<45

Not confirmed
state

Not confirmed
state
Confirmed state
200<X<240

If further problems
arise, refer to the
diagnosing of that

parameter

If further problems
arise, refer to the
diagnosing of those

states
If further problems

arise, refer to the
diagnosing of that

state

If further problems
arise, refer to the
diagnosing of those

parameters

Diagnosis

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