Troubleshooting; To Measure Voltage; To Measure Resistance; To Do A Check Of Cables And Connectors - Husqvarna P524 EFI Workshop Manual

10.1 To measure voltage

Use a multimeter in voltage mode.
1. Hold the red measuring probe against the point
where you measure the voltage. Hold the black
measuring probe against a grounding point or the
negative battery terminal.
2. Read the voltage on the multimeter display.

10.2 To measure resistance

Use a multimeter in resistance mode.
1. Hold the measuring probes at the points where you
measure the resistance.
2. Read the resistance on the multimeter display.
Fault Possible
cause
The start motor PTO ena-
does not start bled.
when the key
switch is turned
to START.
Parking
brake not
applied.
Low bat-
tery volt-
age.
Starter
relay mal-
function.
662 - 001 - 23.10.2018

10 Troubleshooting

Steps Troubleshooting
1 Do a check of the PTO switch.
2 Do a check of parking brake.
3 Make sure that the 20A fuse is not damaged.
4 Measure the battery voltage, >12.0V.
5 Make sure that the screw terminals are tightly attached to the bat-
tery terminals.
6 Measure the voltage of the red cable connected to the ignition
switch. The voltage must be equal to the battery voltage.
7 Do a check of the thin brown cable between ignition switch and the
starter relay.
8 Do a check of the black cable between the starter relay and the
negative terminal on the battery (-).
9 Measure the voltage of the thin brown cable to the starter relay
when the key switch is turned to START. There must be the same
voltage in the cable as in the battery.
On connection, the value must be low (<1 Ohm). On
broken connection, the value must be high (>500 Ohm).
10.3 To do a check of cables and
connectors
• Make sure that the cables are not broken.
• Make sure that the cable sheaths are not worn.
• Make sure that the cable connection in terminals are
not broken.
• Make sure that the terminals are clean.
• Make sure that the terminals are not broken.

10.4 Troubleshooting schedule

Action
Disengage
PTO
Apply park-
ing brake.
Replace the
fuse.
Charge the
battery.
Tighten the
screw termi-
nals on the
battery ter-
minals.
Repair the
wire or re-
place the
wiring.
Repair the
wire or re-
place the
wiring.
Repair the
wire or re-
place the
wiring.
Replace the
ignition
switch.
Troubleshooting - 75