PREVOST H3-41 Maintenance Manual page 316

SECTION 07: TRANSMISSION
FUNCTION
PID/SID
Clutch
system
Clutch
system
32
PA1621 Maintenance Manual All Series | January 2017
ERROR
FMI
J1587
temperature is
above a specific
limit
Deactivate: The
clutch response
is OK
Activate: 1. The
clutch engages
when not
commanded
and,
2. There is no
active fault code
on the SEPoC
and,
3. There is no
active fault code
Unintentional for low air
FMI1 engagement pressure and,
of the clutch 4. There is no
active fault code
on any of the
clutch cylinder
valves and,
5. The PCB
temperature is
above a specific
limit
Deactivate: The
clutch response
is OK
Activate: 1. The
clutch does not
disengage/enga
ge properly when
commanded
Mechanical
2. There is no
system not
FMI7 active fault code
responding
on the SEPoC
properly
and,
3. There is no
active fault code
for low air
pressure and,
CONDITION SYMPTOM
Yellow lamp is
sent
Slow gear
changes
Low clutch
performance
Yellow lamp is
sent
Slow gear
changes
Low clutch
performance
COMMENT
valves are inactive
- There is no active fault
code on any of the clutch
cylinder position sensor
(SEPoC) the clutch valves
- There is no active fault
code for low air pressure
- The PCB temperature is
above 10 dgC
The fault is deactivated if
any of the following
conditions are fulfilled:
- The clutch has been
engaged for more than 20s
with inactive engagement
valves
- There is an active fault
code for the clutch cylinder
position sensor (SEPoC)
Algorithm for
activation/deactivation
The following sequence
must be passed three times
(only once if the fault code-
filter is switched OFF) in
order to activate:
- The clutch is near the
disengaged position
- All clutch valves are
deactivated
- The initial average clutch
position is calculated during
0.1s
- Wait for 3s
- The final average clutch
position is calculated during
0.1s
- If the position has moved
more than 1mm in the
engagement direction, the
FMI is set, else if the clutch
has moved less than 0.2mm
in the engagement direction
the FMI is reset.
Additional conditions for
activation:
- There is no active fault
code on any of the clutch
cylinder position sensor
(SEPoC) the clutch valves
low air pressure
- The PCB temperature is
above 10dgC
Detailed conditions to
activate/deactivate
One of the following
conditions must be fulfilled
three times in a row in order
to activate the fault:
- The clutch position is more
than 2mm from the
disengaged position, after
control of the clutch to the
disengaged position during
1.0 s
- The clutch position is not