Coil Windings Resistance Inspection; Electronic Control Unit (Ecu) - Husqvarna TC449 Workshop Manual

2
1
PIN 1
PIN 3
1
ELECTRICAL SYSTEM

Coil windings resistance inspection

Disconnect the connector (1) from the coil (2).
- Remove the coil (2) as described in the relevant paragraph.
- Measure primary and secondary winding resistance with a meter.
- Primary winding resistance: 0.6÷0.7
- Secondary winding resistance: Open circuit.
If resistance is outside the specified limits, replace the coil.
- Terminal cap resistance: 4.5-5.5 K
If resistance is outside the specified limits, replace the cap.
H06369
H06451
PIN 2
PIN 3
PIN 1
H06309

Electronic control unit (ECU)

Remove the saddle (see Section "E") to gain access to the electronic control
unit (1).
It is composed of a capacitor, a rectifier circuit that handles input signals re-
ceived from the pick-up sensor, a circuit that controls ignition timing advance
in accordance with pick-up sensor inputs and a switching circuit for capacitor
discharge.
H06310
M.32
±15% at 20°C.
±5% at 20°C.
PIN 1
PIN 3
PIN 2
H06452
1 edition (08-2010)_Rev. 11-2010
st