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Hesitation S70

posted by  someone claiming to be Ray N. on  Fri Aug 30 05:01 CST 2002 [RELATED]

The ECU is the Electronic Control Unit. A computer. It controls
fuel delivery, turbo boost, spark timing, etc. About 25 sensors
send it information from barametric pressure, amount of air entering,
engine speed, etc. The ECU is a Motronic version 4.4 by Bosche.
Volvo Technical Service Bulletin 2220003 may apply to your problem
(this data from alldatadiy.com -- subscription is $25 / year):

Engine Control Module - Motronic 4.4 Software Upgrade

Vehicles involved: B5254S, B5254T, B5234T

M 4.4 Software Upgrade

Background:

An engine control module (ECM) software upgrade is available to enhance overall engine speed performance. This will smoothen the occasional variation in engine speed which may be experienced on some vehicles.

Cars involved:

Model Factory Chassis no.

S70 1 486000-557290

S70 2 486000-559255

V70 2 432000-533259

C70 J 000650-006752

C70 Conv J -000562





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