Dacia SuperNova (engine E7J). Service manual — part 122

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DIAGNOSTIC – FAILURES AND STATES INTERPRETATION

1. FAILURE OF COMUNICATION CLIP TESTER/ E.C.U. DECODER

RECOMMENDATION

Check if the lines K and L are not disturbed by another computer
of the vehicle.

Check the fuse state F15 (vehicles up to 01.06.2001) or F07 (vehicles after 01.06.2001).
Replace the fuse if necessary.

Check if the CLIP tester is not the cause of the failure; check if the tester communicates with
another computer of the same vehicle (injection computer).

Measure the tension of the vehicle’s battery (U> 10,5V). If necessary, charge the battery.
Check if the E.C.U. decoder is well connected to the vehicle’s wiring.
Check the right supply of the E.C.U. decoder:

- presence of the ground at pin A8 of the E.C.U. decoder
- supply + I.C. at pin A9 of the E.C.U. decoder

Be sure that the diagnostic socket is proper supplied, according to the circuit diagram.
Check the continuity and the isolation of the electric wiring on the corresponding pins layout.
E.C.U. decoder A3 7 diagnostic socket
A4 15

If the connection tester CLIP – E.C.U. decoder can’t be established, then replace the decoder.

{ }

After establishing the communication with the tester, fix the

AFTER REPAIRING

possible failures.
Perform a conformity checking.

DIAGNOSTIC

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2. 4D STATE: + 12 V (+DC) SUPPLY, EXISTENT.

RECOMMENDATION Observation :

- 4D state = ACTIVE when the contact is on “M” position
- 4D state = PASSIVE when the contact is not on “M ”position

AFTER REPAIRING

Perform a conformity checking.
Check the operation of the anti starting system.

YES

NO

Replace the E.C.U. decoder if it can not be realised its communication with the tester.

Repair the electric wiring on the supply layout to the pin A7 of E.C.U. decoder.

Check the F03 fuse state.
Replace the fuse if necessary.

Place the contact on “M” position and check the presence of +12V at the pin A7 of the
E.C.U. decoder. Is there +12V?

DIAGNOSTIC

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3. FAILURE : DOORS BLOCKING CONTACTOR

Remove the memorised failure by means of the CLIP tester.

AFTER REPAIRING

Perform a conformity checking.
Check the operation of the anti starting system.

Check the isolation related to the ground of the wiring
between the E.C.U. decoder doors’locking switch

B2 pin

pole 1

B5 pin

pole 3

Is there a correct isolation?

Repair the electric wiring.

No

Replace the doors’ locking switch.

Yes

RECOMMENDATION Check if the contactor does not remain permanently pressed due

to a mechanical blocking.

DIAGNOSTIC

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4. FAILURE: MISSING SIGNAL ON THE CODED LINE E.C.U. DECODER-
COMPUTER INJECTION

RECOMMENDATION

Check the continuity and the isolation related to the ground and + 12 V of the wiring between
the E.C.U. decoder PinA6 pin58 injection computer.
Fix it if necessary.

Set the contact on and perform the detection test by the CLIP tester at pin A 6 of the ECU
decoder.
Are there any impulses?

YES

NO

Replace the injection computer.

Replace the E.C.U. decoder.

Remove the memorised failure by means of the CLIP tester.

AFTER REPAIRING

Perform a conformity checking.
Check the operation of the anti starting system.

DIAGNOSTIC