jcb JS300 Service Manual page 504

Wires and Connectors
Harness connector C123 - Mode switches
Pins Details
1 Not Used
2 Not Used
3 H+ power mode switch (low side output)
4 Travel speed mode select switch (low side output).
Refer to Hydraulic Control in this section
5 Common earth (0V)
6 Auto idle switch (low side output)
Harness connector C094 - Throttle potentiometer
Pins Details
1 Power supply (+ 5V reference)
2 Signal (0 to + 4.5V)
3 Earth (0V)
K Fig 17. Circuits - Throttle Potentiometer and Mode
Buttons ( T C-80)
The throttle potentiometer (C094) is connected to a 5V
reference voltage supplied by the MECU from connector
J1, pin 28 (C015).
C-79
Fig 16. Harness connectors C123, C094
The 5V reference voltage is also connected to the cooling
fan
Fan ( T C-107)
The throttle potentiometer has a shared 0V reference with
the travel, auto idle and H+ mode switches (C123)
connected to the MECU at connector J1 pin 14.
The throttle potentiometer feed back signal (0 to 4.5V) is
connected to the MECU at connector J2, pin 21.
9813/5100-1
Section C - Electrics
Engine and Power Control
Engine Throttle and Power Mode Control
control module (C038).
C128400
K Electro
Viscous
C-79