Ignition/Fuel Control Modules - Revised

Model:
700-900

Group:
28

Number:
910

Title:
Replacement Of Rex/Regina Control Modules
740/940 1989- Early 1992
B230F MFK 30/39 Only

Market:
US and Canada

Date: December 1993

This Bulletin Supersedes SB 28-710; Dated 8/92

Reference:
TP 31903/1 (English); 09/88; Fuel System Regina Ignition
System REX-I
SMB 00-138A;5/92; Service Campaign 59
SB 28-113

Replacement of Rex/Regina control modules

This service bulletin applies to 1989-92 740s and 940s, and describes the modifications to be made to the fuel injection and ignition systems when either of the control modules must be replaced.

To simplify parts handling, only the latest versions of the Rex/Regina fuel injection and ignition control modules will be stocked (i.e., versions used in new production models since August 1993).





The Rex/Regina control modules available.


Combining control modules of different versions:




Control module versions are matched to each other, a fact which must be taken into account when replacing a fuel injection or ignition module. It is important to ensure that the correct ICM is utilized when replacing the MFI control module and vice-versa. The illustrated table shows the possible control module combinations and the measures which must be implemented to ensure satisfactory operation of the systems.

Consequences of modifications:

- On completion of the above measures, the cold-start valve will remain installed but will not function.

- Information that the A/C compressor is switched in will no longer be shown by the Volvo Scan Tool (VST) under "Monitor test". In all cases, the instrument will indicate that A/C is on, regardless of whether the A/C is on or off.

Whenever older vehicles are updated with the latest programming, it is important to ensure that the throttle body is adjusted to specification as per SB 25-704, Section 1.1 - 1.5.

Replacement of fuel injection control module and modification of wiring

Procedure:

Record any fuel injection and ignition system diagnostic trouble codes (DTC) and correct faults as required.

Remove/disconnect:




- front screw in sill protector (1)
- cover over MFI control module (2)


IMPORTANT:
Module must be dead when connector is removed or reconnected, otherwise damage may result. Remove Fuse # 1 to avoid damage to control modules.


Ensure that ignition is switched off.




Disconnect 35-pin connector from module.

Cut tie securing rubber protector and fold aside protector.

Remove protective cover from connector.

Modify 35-pin connector as follows:

Remove grey-black (GR-SB) lead from position 32 in connector.




Cut lead 1-3/4" from connector entry as illustrated.




Remove green-yellow (GN-Y) lead from position 15 in connector.

Cut lead 3-1/4" from connector entry as illustrated.

Remove green-red (GN-R) lead from position 14 in connector and insert in position 15.

Caution:
Remove lead carefully to avoid damage to terminal.




To insulate ends of the grey-black and green-yellow leads, crimp splicing sleeves, p/n 956958-3, onto uncut ends.

Note:
Do not strip ends and ensure that sleeves are securely crimped in position. Replace protective cover over connector. Bend rubber protector back into position and secure with new cable tie.

Compare part number on MFI control module in car with numbers in table.

Replace module if number does not agree with p/n specified in table.

Apply grease, p/n 1161417-9 into terminal sleeves of connector.




Reconnect connector to module.

Reinstall:




- cover over control module (2)
- screw in sill protector (1)

Inspection/replacement of ignition control module (ICM).




Remove knee bolster and reinforcing plate on driver's side. Check label on module.

ICM Location:

Compare part number on label with numbers in table on page 2. Replace module if number does not agree with p/n specified in table.

IMPORTANT:
Module must be dead when connector is removed or reconnected, otherwise damage may result. Remove Fuse # 1 to avoid damage to control modules.

Properly reinstall knee bolster and reinforcing plate.

Reconnect battery ground lead on completion of work. Clear codes (if any) in fuel and ignition systems.

Test-drive car. Display new codes (if any) and correct as required.




WARRANTY STATEMENT:
Claims may be submitted under demonstratable defects under the Emission Warranty using:

Wiring Diagram:

Regina Fuel Injection System (B230F) - Wiring Diagram