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Troubleshooting; Troubleshooting Schedule - Husqvarna 112C5 Workshop Manual

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10.1 Troubleshooting schedule

Fault
Possible cause
The start motor
Cutting deck
does not start
lowered.
when the key
switch is turned
to START.
Parking brake
not applied.
Low battery volt-
age.
Defective starter
relay.
Defective park-
ing brake micro-
switch.
Defective lift lev-
er microswitch.
Wiring fault.

48 - Troubleshooting

10 Troubleshooting
Steps
Troubleshooting
1
Make sure that the lift lever is in the top position.
2
Do a check of parking brake.
3
Make sure that the 15A fuse is not damaged.
4
Measure the battery voltage, >12.0V.
5
Measure the voltage of the red cable connected to
the ignition switch. The voltage must be equal to the
battery voltage.
6
Do a check of of the thin brown cable between igni-
tion switch and the starter relay.
7
Do a check of the black cable between the starter re-
lay and the negative terminal on the battery (-).
8
Measure the voltage of the thin brown cable to the
starter relay. When the key switch is turned to
START, the voltage in the cable and the battery must
be the same.
9
Measure the resistance of the relay. It must be
3.7-4.2 Ω.
10
Do a check of the parking brake microswitch.
11
Do a check that the microswitch changes the posi-
tion when the lift lever is lifted.
12
Measure the resistance between the thin black cable
to the starter relay and the negative battery terminal.
If the parking brake is applied and lift the lever in the
top position, the resistance must be low.
13
Measure the resistance between the black cable to
the starter relay and the connector to the wiring to
the pedal plate 1 pin. The resistance must be low.
14
Measure the resistance between the wiring to the
pedal plate pin 5 and the negative battery terminal.
The resistance must be low.
15
Measure the resistance between the wiring to the
pedal plate pin 2 and the negative battery terminal. If
the lift lever is in the top position, the resistance must
be low.
16
Do a check that the grounding point on the engine is
fully tightened.
Procedure
Move the lift lev-
er to the top po-
sition if it is nec-
essary.
Apply parking
brake.
Replace the
fuse.
Charge the bat-
tery.
Repair the cable
or replace the
wiring.
Repair the cable
or replace the
wiring.
Repair the cable
or replace the
wiring.
Replace the ig-
nition switch.
Replace the
starter relay.
Replace the mi-
croswitch.
Replace the mi-
croswitch.
Go to next step.
Repair the cable
or replace the
wiring.
Repair the cable
or replace the
wiring.
Repair the cable
or replace the
wiring.
Tighten the
ground cable.
1342 - 001 - 09.03.2020

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