Case 580SR, Service Manual

Page: 347 / 1068

SECTION 21 - TRANSMISSION 281
FAULT CODE F9 AND F10 / DIRECTION
MODULATION OUTPUT SHORT OR OPEN
CIRCUIT
A fault on this output is considered as a problem po-
tentially reducing transmission life.
For this reason while a fault is persistent, the allow-
able direction change speed limit is decreased grad-
ually (10%) each time a direction change was
inhibited, down to a minimum of 20% of the maxi-
mum allowable shift speed.
After a while, this can result in a severely degraded
performance (only low speed reversals are possi-
ble), but it has the advantage that the driver cannot
be surprised by a sudden performance loss, which
could constitute a safety hazard in itself.
Direction Modulation Solenoid (E03) Pin T
The variable Current solenoid for direction modula-
tion is connected to the modulation Common Plus
(Pin K) at one side and to (Pin T) at the other side.
A programmable current is increased or reduced to
the solenoid controlling the modulating pressure.
No current corresponds to maximum pressure.
Approximately 1 Amp corresponds with no pressure.
F28368
F
1 2 3 4
1 2
Blinks
Blinks
Blinks Blinks
in Phase
3 4 5
6
6
7 8
N R T N
F4296
A
B
C
D
E
F
G H
J
K
L
M
N
P
R
S
T
U
V
1
2
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