Group 23 EMS 2 Diagnostic function
Diagnostic function
The diagnostic function monitors and checks that the EMS 2 system functions normally.
The diagnostic function has the following tasks:
Detecting and locating disturbances
Reporting detection of disturbances
Providing guidance when troubleshooting
Message regarding disturbance
If the diagnosis function detect a disturbance in the
EMS 2 system, this is reported using fault codes via
the instruments. Depending on which equipment is
used, this is reported in various ways (fault codes can
also be read using VODIA):
For DCU - Display Control unit:
the text” !! ENGINE WARNING !!” shows on the
display. NOTE: you can select the language with
which the DCU will present the information.
For CIU - Control Interface Unit:
the diagnostic lamp starts to flash
Simultaneously, the fault will be stored in the control
module memory. As soon as the fault has been at-
tended to and the ignition is turned off and on, the
fault code will no longer show as active.
DCU - the fault code shows as passive
CIU - the diagnosis lamp turns off
Both rectified (passive) and un-rectified (active) faults
are stored in the control unit.
For reading fault codes, see chapter Operation on
page 34.
All fault codes are found in the fault code list with in-
formation about cause, reaction and actions, see
chapter on ”Fault codes.”
NOTE: The indicated flashing codes apply only if the
Volvo Penta CIU is used.
Effect on the engine
The engine is affected in different ways, depending on
the seriousness of the fault detected by the diagnostic
A fault message in the form of a fault code is always
generated when the diagnostic function discovers a
The engine is affected by different degrees (see be-
low) depending on the seriousness of the fault:
The engine is not affected.
Engine goes to idle speed (VE engines).
Engine torque is limited to different levels (VE en-
Engine is shut off.

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