Husqvarna P524 EFI Workshop Manual page 76

Fault Possible
cause
Parking
brake mi-
croswitch
malfunc-
tion.
PTO but-
ton
Wiring
fault.
Key
switch
Circuit
board
The start motor Wiring
operates cor- fault.
rectly but the
product does
not start.
The product Defective
stops when the seat mi-
parking brake croswitch.
is released.
The product PTO ena-
stops when the bled
operator lifts
from the seat
with the park-
ing brake ap-
plied.
76 - Troubleshooting
Steps Troubleshooting
10 Measure the resistance of the relay. It must be 3.7-4.2 Ω.
11 Make sure the relay clicks when the key is turned to "Start".
12 Do a check of the parking brake microswitch.
13 Loosen connector J6 and measure the resistance between the or-
ange, gray and yellow pairs in the wire connectors. When the PTO
switch is pressed, must only the orange wires be connected.
When the PTO button is lifted, the orange wires must not be con-
nected but the other wires must be connected.
14 Do a check of the red, blue, white and brown wires and connec-
tions going from J1.
15 Do a check of the grey wires and connections going from J7.
16 Do a check of the orange wires and connections going from J6.
17 Do a check of the blue and brown wires and connections going
from J3.
18 Do a check of the blue and yellow wires and connections going
from the parking brake microswitch.
19 Measure the voltage on the gray wire from J7 (pin 1) when the
start key is turned to "Start". The voltage in the wire must then be
12V.
20 Measure the voltage on J7 (pin 2) and J7 (pin 4). The voltage must
be equal to the battery voltage.
1 Do a check the pink wire and connectors between J1 (pin 4) and
the fuel valve.
2 Do a check the black wire and connectors between J1 (pin 6) and
the engine.
1 Measure the resistance between the wire going to J3 (pin 1) and
the cable going to J3 (pin 4). With no operator in the seat, the re-
sistance must be low. When the operator in the seat, the resist-
ance must be high.
1 Do a check of the PTO switch.
Action
Replace the
starter re-
lay.
Replace the
starter re-
lay.
Replace the
micro-
switch.
Replace the
PTO button.
Repair the
wire or re-
place the
wiring.
Replace the
key switch.
Replace the
circuit
board.
Repair the
wire or re-
place the
wiring.
Do a check
of the seat
microswitch
and con-
nector, re-
place if nec-
essary
Replace the
PTO switch.
662 - 001 - 23.10.2018