Repair Procedure:

If a confirmed customer complaint is diagnosed after any out-of-line conditions have been corrected, new MFI LH2.4 E PROMs are available for vehicles equipped with the Bosch LH2.4 engine management system as indicated below. The procedure that follows explains the proper method for installation of the E PROM kit.

E PROM Application Chart





Inspect the MFI control module in the vehicle to verify the correct E PROM required. The best way to find out if a car has been already updated is to check the label on the LH MFI control module in the car against the chart above. If the label has either the program code (Vxxxxxxx) AND/OR the part number indicated under the "updated MFI LH2.4 Control Module Identification" column, the car has the latest programming.

If a verified owner complaint necessitates this repair, you must ensure that the upgrade has not already been performed on the vehicle.

Non-EGR 240 models before the chassis numbers indicated above may have had an updated control module already installed. If control module p/n 9146223-4 or 5003926-2 is installed, the car already has the new programming.

Non-EGR 240 models before the chassis numbers indicated above which have had the low volatility fuel E FROM already installed can be identified by a label indicating "ECU 93" on the front passenger door.

For all other applicable LH2.4 variants, previously updated 1993 or earlier cars can also be identified by a label indicating "ECU 93" on the front passenger door.

Caution:
it is critical to the success of this operation that this procedure is performed by a trained technician and followed exactly as written, Failure to do so may result in electrostatic discharge (ESD) causing damage to the E PROM or other control module components. Such damage will not be given warranty consideration.

CONTENTS OF E PROM KIT:





The E PROM kit consists of the components above:

VEHICLE PREPARATION

If installed, remove the cold start kit (p/n 3531106-7, ref SB 23-204/708; April 1989) before exchanging the E PROM.

WORK AREA AND SPECIAL TOOLS

The exchange of the E PROM must be done in a fixed workday and in a separate location. The location must be clean, e.g. free from dust, dirt, oil, solvents, etc. The work must be done on a static dissipative mat, which must be kept clean! The mat must be connected to a ground point (electric grounding system, waterpipe or other safe groundpoint).

See Shop Equipment Bulletin # 18 for applicable equipment which is commercially available. All tools used must be ESD-approved.

METHOD

Remove MFI LH control module from vehicle.





- Ignition off

- Remove control module unit fuse from battery (740, 940, 780: no. 1, 760: no. 31, 240: in engine compartment (-90) or no. 6 (91-)).

The control module must have been at ambient room temperature, 72°F (22°C), for at least one hour before opening (to prevent condensation inside).





Place the static dissipative mat on a clean surface. Connect the ground wire to a suitable ground point (according to previous page).

Caution:
Both the wrist strap and static dissipative mat should be attached to the same ground point.

WASH YOUR HANDS IN WARM WATER WITH SOAP. HAND LOTION MUST NOT BE USED AFTER WASHING.





Fit the wrist strap around one wrist (to eliminate static electricity). Adjust wrist strap to fit snugly.





Put the control unit upside down on the static dissipative table mat. With a small screwdriver, open the control unit by bending the tabs up. Fully open them with pliers. All tools must be ESD-approved.

Turn the control module over so that the cover is up. Place the control module so the connector is away from you.





Carefully lift the cover so that it will not come in contact with the components on the circuit board.

Remove the E PROM cover.

Insert a small screwdriver (ESD-approved) in each slot on the cover and pry carefully.

When the cover is loose, lift it.





Mark the old E PROM with the "scrap" sticker provided in the kit (so that it will not be re-installed in error).

Locate the extractor over the prom to be removed, pressing the lever together until the prom pops up.

Put the old E PROM aside.

Note:
Do not re-use the replaced E PROM.

Verify E PROM kit part number against control module, see E PROM application chart.

Open the E PROM box.

Caution:
Do not touch E PROM.





Pick up the new E PROM with the inserter tool (press in the button on the side of the tool when applying the tool over the E PROM).

Check that all pins on the new E PROM are in good order.





(If bent in, loosen the E PROM, set the prom over the gray part of the shaft on the tool, straighten the pins).





Important:
Align the notch in the prom with the notch in the socket base.

Carefully locate the E PROM and press it down with the inserter tool without pressing the button. Remove the tool. Check that all pins are in their proper location.





Install the E PROM cover. It must be securely closed.

Install the control unit cover carefully.





Bend the tabs down using ESD-approved pliers.

Caution:
To avoid damaging internal components, do not press on the case with excess force. Do not under any condition pound or hammer on the control unit or place it in a vise.

Make sure that the cover is secure and all tabs are tight.





Place a new Volvo label with the proper control unit P/N over the old label. Leave part of the old label visible (10-digit Bosch number); however, cover the bar code. (See illustration)





Write the date and dealer code in the lower left-hand corner of the label.





Attach "ECU 93" sticker to inside rear-facing edge of passenger-side door as shown.

Check for new DTCs (if any).