Volvo VNL Operator's Manual page 144

Fault codes are shown
1 If there is a fault code or codes the
following is shown, for example:
Identification of ECU
Line 1:
Line 2: Identification of parame-
ter/component
Line 3: Fault type identification
" 1" shows how many times the fault has
been registered since the last resetting. If
no information is available for how many
times the fault code has been registered,
only Active is shown (the fault remains). Or
alternatively Inactive is shown (the fault
was there previously).
The arrow in the lower, right-hand corner is
shown if there is more than one fault code.
The up/down buttons move the cursor and
the next fault code/message is shown. To
reset codes, a password must be entered
(see page 158).
2 If more than 20 fault codes/messages
are available for the chosen ECU the
21st message will be:
To see those messages that are not
shown, earlier messages must be reset
(see above). The fault codes are pre-
sented in text format, but the user can
also choose to have the fault codes
presented numerically (if a fault code
or ECU is not recognized by the sys-
tem, they will only be presented in
numeric format).
Graphic Display
Engine
Coolant temperature
Value too high
Active
Engine
Too many
error messages
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1 I