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Dacia SuperNova (engine E7J). Manual - part 27

E7J-A-2/60 ENGINE

IGNITION AND INJECTION

17 - 18

DIAGNOSING-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 fuses 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
circuits:

-pin 28 of calculator

♦ mass

-pin 33 of calculator

♦ 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

E7J-A-2/60 ENGINE

IGNITION AND INJECTION

17 - 19

DIAGNOSING-INTERPRETING THE DEFECTS

DEFECT
PRESENT

COMPUTER
1. Breakdown computer
2. Breakdown zones memory of protection
3. Breakdown zones memory antistarting up

SUGGESTIONS

Non-conforming or faulty calculator
Change the calculator

Do not immediately change the calculator
Perform the following procedure:
- set the contact and enter a dialogue with the calculator
- erase the defect memorized by the calculator
- take contact and wait till the dialogue with the calculator is lost
- set contact and enter a dialogue with the calculator.
If the defect is still there, redo this procedure.
If after the fifth attempt of erasing the “calculator” defect is still
there, change the injection calculator.

AFTER REPAIR

Erase memorized defects.

E7J-A-2/60 ENGINE

IGNITION AND INJECTION

17 - 20

DIAGNOSING-INTERPRETING THE DEFECTS

DEFECT
PRESENT
OR MEMO-
RIZED

SUPPLY
1. Breakdown + 12V after the actuator relay 238 (D)
2. Breakdown + 12V after the contact (D.C)

SUGGESTIONS

Conditions of breakdown detection by the calculator:
-take the contact and wait till dialogue with the tester is lost
-put the contact and enter dialogue.
Conditions of performing the diagnosing:
-defect is present.

Check the state of the battery and the connections to the mass.
Remedy if necessary.

Check the connecting and the state of the connector of 238 relay.
Change the connector if necessary.

Check the presence of +12V at the pole 3 of 238 relay.
Remedy the circuit to fuse S

Take plug 5 out of the connector of 238 relay.
Check, after setting the contact, the presence of +12V at the pole 5 of
238 relay.
Change relay if necessary.

Check insulation and the continuity of the circuit:
pin 66 of calculator

pole 5 of actuator relay 238.

Remedy if necessary.

Disconnect an element at a time (injector, canister draining valve, probe
O

) and check the presence of +12 V for each of them.

Change the faulty element.

The defect is not active because it causes the loss of dialogue with the
tester

AFTER REPAIR

Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.

E7J-A-2/60 ENGINE

IGNITION AND INJECTION

17 - 21

DIAGNOSING-INTERPRETING THE DEFECTS

CIRCUIT OF COMMAND ACTUATOR RELAY

1. Circuit of command or short-circuit to the mass of the circuit to-

wards pin 39 of the calculator

2. Short-circuit at 12V along the circuit towards pin 39 of the calculator

SUGGESTIONS

Conditions of breakdown detection by the calculator:

-take the contact and wait till dialogue with the tester is lost
-put the contact and enter dialogue.

Condition of performing the diagnosing:

-defect is present.

REMARK: This defect has priority and should be dealt with be-
fore the following ones.

Check the state of the battery and the connections to the mass.
Remedy if necessary.

Check the connecting and the state of the connector of 238 relay.
Change the connector if necessary.

Check the presence of +12V at the pole 1 of 238 relay.
Remedy the circuit to fuse S

in the engine compartment.

Check the coil of the 238 actuator relay.
Change relay if necessary.

Connect the 90-way terminal-tester instead of the calculator and check the insulation and
the continuity along the circuit:
pin 39 of calculator

♦

pole 2 of actuator relay 238.

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
calculator.

AFTER REPAIR

Erase defects memorized by the computer.
Perform the steps under “Suggestions” to confirm the repair.
Remedy other possible defects.

DEFECT
PRESENT

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