MIL ON, DTCs EFI-611, EFI-612 EVAP Leakage

SECTION
2

GROUP
23

NO.
0007

YEAR
1997

DATE
12

REFERENCE: TP 2308202, Section 2(23, 28) Motronic 4.4; 850 1996-

Diagnosing fault codes EFI-611, EFI-612

Background:

Some customers have seen the Malfunction Indicator Lamp (MIL) coming on. The cause has been leakage in the fuel evaporative system. Fault codes EFI-611, EFI-612.

In many cases the root cause is, that the customer fills up the gas tank with the engine running, or does not tighten the gas cap.

This is a quick test to perform when fault tracing these DTC:s, before performing any other repair.





Method

- Check and tighten the gas cap.

- Ignition on.

- Erase DTC:s.

- Gear in P or N position.

- Warm up engine (above 7O°C = 158°F).

- Let engine idle.

- A/C off.

- Use menu of diagnose test.

= Select Activate Diagnosis

= Select Leakage Diagnosis

- Run the diagnose. Can take up to 2 minutes.

For Scrolling values, see Service Manual; TP 2308202, Motronic 4.4, Volvo Scan Tool (ST)

Scrolling Values, step RRR.

- If the run doesn't go through switch off the engine and restart.

- Read fault codes.

Note
If the texts START CONDITIONS NOT MET or DIAGNOSTIC INTERRUPT appears, this can have several causes: High fuel evaporation, high canister charge, high tank pressure, fuel trim not active or a DTC posted after the diagnostic has been activated. Check that no DTC:s are stored, restart the car and activate the diagnostic. Several attempts can be required.

Will the fault code reoccur?

No:

The DTC was posted due to idling during filling up, or the gas cap was not tightened.

Yes:

Perform fault tracing according to

Service Manual section 2 (23, 28)
Motronic 4.4
850 1996-
TP 2308202


Section UUA, UUB, UUC, UUD or VVA, VVB, VVC, VVD.