Device Display Meaning for the LMV5x System Corrective Action
Any #
Basic unit has detected a plausibility fault in the ratio control
system.
The diagnostic code describes the cause of the fault
(see below).
00 Ratio curve of the air actuator is not fully defined
01 Ratio curve of the fuel actuator is not fully defined
02 Ratio curve of auxiliary actuator 1 is not fully defined
03 Ratio curve of auxiliary actuator 2 is not fully defined
04 Ratio curve of auxiliary actuator 3 is not fully defined
05 VSD curve is not fully defined
0A Calculated P-part outside the permissible range
0B Calculated I-part outside the permissible range
0C Calculated system delay time outside the permissible range
0D Calculated O2 setpoint outside the permissible range
0E Calculated O2 min. value outside the permissible range
0F Calculated O2 ratio value outside the permissible range
14
Calculated standardized value lies outside the permissible
range
Check if the correct values have been entered for the
standardized values.
Readjust O2 trim control, if required, or repeat the
settings.
20
With hysteresis compensation: Permissible target positioning
range exceeded
21
The load / point number predefined by the AZL lies outside
the permissible range
22 Unplausible program branch
23 Unplausible fuel-air ratio phase
40 Unplausible target positions
16 LMV5
If fault occurs sporadically, reduce electrical noise.
If fault occurs continuously, replace LMV5.
Internal Fault
Basic Unit
Check parameters (P Low-Fire, I Low-Fire, Tau Low
Fire, P High-Fire, I High-Fire, Tau High-Fire). These
values normally self-set when the delay time is
measured. Check the values of these parameters
against the maximum and minimum ranges. Readjust
O2 control curve if necessary.
The O2 control curve must be 0.1% O2 lower than the
%O2 measured at the ratio control curve, and 0.1%
above the O2 alarm curve. Readjust curves.
Ensure that actuators that are addressed and activated
have their positions defined. Check curve points to see
if correct values have been entered for the actuator or
VSD. Readjust the ratio curve, if required.
Fault with Base Unit (LMV5) Ratio Control, O2 Trim, VSD
Section 7 Page 26 SCC Inc.
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