Husqvarna PT26D - Built-In Test Equipment

English-41
DESIGN AND FUNCTION
Built-in test equipment
The electrical system is equipped with BITE (Built In Test Equipment) in the form of LEDs on the circuit
card and in the sensors. The LED on the circuit card for each circuit comes on when a function is activated.
The circuit card diodes can emit the following signals:
• Green, circuit OK
• Red, circuit short circuited
• Red and green, open circuit.
Most diodes work in pairs as set out in the table below. Some circuits lack the red LED. This entails another
troubleshooting method, described in chapter Troubleshooting.
LED function table
Detailed table, see “Trouble shooting table LEDs” on page 128.
LED Colour Function
LD1
LD14
Green
Red
Valve blade Voltage out
Valve 1 V blade Fault
LD2
LD13
Green
Red
Valve 6 extra equipment A-side Voltage out
Valve 6 extra equipment A-side Fault
LD3
LD12
Green
Red
Valve 5 extra equipment B-side Voltage out
Valve 5 extra equipment B-side Fault
LD4
LD15
Green
Red
Switch weight transfer Voltage out
Switch weight transfer Fault
LD5
LD16
Green
Red
Valve 2 lift function Voltage out
Valve 2 lift function Fault
LD6
LD17
Green
Red
High speed Voltage out
High speed Fault
LD7
LD18
Green
Red
Diff lock.Voltage out
Diff lock Fault
Fault LD8
LD19
Green
Red
Solenoid clutch Voltage out
Solenoid clutch Fault
LD9
LD21
Green
Red
Flasher right Voltage out
Flasher right Fault
LD10
LD22
Green
Red
Flasher left Voltage out
Flasher left Fault
LD11
LD20
Green
Red
Injection pump Voltage out
Injection pump Fault
LD23 Green Starter motor Voltage out
LD24 Green Glow plug heating Voltage out
LD25 Green High beam voltage out
LD26 Green Low beam Voltage out
LD27 Green Cooling fan Voltage out
LD28 Green + 12 V Voltage out