Fuel and Ignition Control Units - Replacement
91volvo05
MODEL GROUP NUMBER
700/900 28 103
TITLE
B234F Fuel/Ignition Electronic
Control Units, Replacement
MARKET DATE
US and Canada August 1991
REFERENCE: TP 31354/2 (ENGLISH); 09/90; LH 2.4 FUEL SYSTEM
B234F Fuel and Ignition Control Units/Replacement
Both fuel and ignition ECU's were updated during 1991 M/Y production. The change is effective from the following chassis numbers:
Engine Model Plant Chassis No.
B234F 944 - 1 (VTV) - 028806
945 - 1 (VTV) - 016290
B234F 944 - 2 (Ghent) - 029644
945 - 2 (Ghent) - 016477
B234F 944 - 3 (Halifax) - 030393
945 - 3 (Halifax) - 018209
Both new-version ECU's will function in earlier applications, but only in tandem. (Refer to chart).
When Volvo's inventory of early fuel and ignition units is depleted, they will be superceded by the new-version units. Once a vehicle is updated with both new-version units, it is then possible to replace one independently of the other as needed.
Note: Federal and Calfornia emissions regulations restrict the interchangeability of control units. Refer to the applications list.
B234F Control Unit Application List
Only the following combinations of fuel and ignition control units are allowed. When replacing a fuel or ignition control unit on a B234F engine, do not mix early and late versions. Do not install early ECU's in late-version applications.
Market Model Model Year Fuel control unit Ignition control unit
all no EGR --> '91-1/2* 3517608-0 ------------------------ 3517609-8
5517608-5 ------------------------ 3517609-8
3507604-1 ------------------------ 3507646-2
5003793-6 ------------------------ 3507646-2
all no EGR '91-1/2* --> 3507604-1 ------------------------ 3507646-2
5003793-6 ------------------------ 3507646-2
all with EGR --> '91-1/2* 3517372-3 ------------------------ 3517371-5
3517372-3 ------------------------ 3507213-1
3507605-8 ------------------------ 3507645-4
5003794-4 ------------------------ 3507645-4
all with EGR '91-1/2* --> 3507605-8 ------------------------ 3507645-4
5003794-4 ------------------------ 3507645-4
Refer to chassis number listing on previous page. From those numbers onward, only the new-version control units may be installed.
WARRANTY STATEMENT: Should replacement of a control unit be necessary, claims may be submitted under the terms of the Emission Warranty. See VSTG for applicable labor operations and time allowances.