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Section F
33 - 2
Powershift Gearbox - 6 Speed
ECU Electrical Connections
Electrical connections at the ECU are shown in the diagram
below. Connections are divided into two groups;
GB Connections to components mounted on the gearbox
GC Connections to components mounted elsewhere on the
machine.
For the key to the main components see Component
Identification on the previous page. For more detailed
explanations of the electrical connections for gearbox
control see subsequent pages.
Note: When fault finding DO NOT use a multimeter on the
ECU connector pins. Only test the associated wiring,
uncouple connectors GB and GC and then use a multimeter
at the pins inside these connectors as applicable. Use the
ShiftMaster Diagnostics system to identify possible faults
with the ECU See Powershift Gearbox - 6 Speed,
ShiftMaster Diagnostics - User Guide.
12V
C
FORWARD
F
NEUTRAL
N
REVERSE
R
1
2
3
A
B
K
THROTTLE
D
J
KICKDOWN
DRIVER INDICATOR
R
P
LOW
OIL PRESSURE
SPEEDOMETER
F
PARK BRAKE
9803/3280
Transmission
Electrical Connections
12V
(IGNITION)
GB7
IN
GB28
IN
GB38
IN
GEAR 1
GB18
IN
GB8
GEAR 2
IN
GB27
GEAR 3
IN
GB17
GEAR A
IN
GB19
IN
GB20
D-4WD
IN
GB37
DUMP
IN
GB40
I-4WD
ShiftMaster ECU
IN
GB39
IN
GB25
OUT
GB13
OUT
GB14
OUT
GB30
IN
Purchased from www.WorkshopManuals.co.uk
GB1 Feed from GC10
GB2 12v Feed
GB4 12v Feed
GB6 Diagnostics connector
GB7 Forward switch
GB8 2nd gear switch
GB13 Warning lamp
Low trans oil pressure
GB14 Speedometer input
GB17 Auto gear switch
GB18 1st gear switch
GB19 Throttle switch
GB20 Foot brake switch
(4WD/4 wheel brake)
GB24 Diagnostics connector
GB25 Master warning lamp
GB26 ECU Earth
GB27 3rd gear switch
GB28 Neutral switch
GB30 Parkbrake ON switch
GB36 ECU Earth
GB37 Trans dump switch
GB38 Reverse switch
GB39 Kickdown switch
GB40 4WD switch
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
GND RTN
FREQ2
1
IN
IN
A408760
DIAGNOSTICS
3
CONNECTOR
Section F
GC3 Speed sensor -
input
GC4 Output - 'Z' solenoid
GC6 Output - 'U' solenoid
GC10 Feed to GB1
GC11 Switch
Low trans oil pressure
GC12 Output - 'X' solenoid
GC13 ECU Earth
GC15 Output - 'Y' solenoid
GC18 Output - 'S' 4WD
solenoid
GC20 Output - 'V' solenoid
GC21 Switch
Trans oil temperature
GC23 Output - 'W' solenoid
GC24 Output - 'T' solenoid
S-Z
GC4
'Z' SOLENOID
GC6
'U' SOLENOID
GC12
'X' SOLENOID
GC15
'Y' SOLENOID
GC18
4WD SOLENOID 'S'
GC20
'V' SOLENOID
GC23
'W' SOLENOID
GC24
'T' SOLENOID
GC13
BANK 1 GROUND RETURN
GC10
GC3
TRANS SPEED
SPEED
SENSOR
L
LOW TRANS
OIL PRESS
GC11
E
HI TRANS
GC21
OIL TEMP
N
12V
33 - 2
12V
H
Issue 1
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