Husqvarna TC 449 2011 I.E. Workshop Manual page 327

ELECTRICAL SYSTEM
TC 449 2011/2012 I.E.
TE 449 - 511 2011/2012 I.E.
TXC 449 - 511 2011/2012 I.E.
SMR 449 2011 I.E.
SMR 511 2011/2012 I.E.
The ignition system is controlled by the ECU (1). The ignition is an integrated
digital electronic ignition system with static timing and advance using intermittent
sequential phased electronic injection feed. This ignition system is composed of
a crankshaft position (pick-up) sensor (2), an ECU (1), an ignition coil (3) and
an intake manifold pressure sensor (5). The ignition coil is fed by the battery
through a power relay and is controlled by the ECU. Ignition timing is accurately
determined based on engine RPM and accelerator position. In addition to these
key parameters, inputs from the intake air temperature (4) and pressure (5)
sensors and from the coolant temperature sensor (6) are also used to control
ignition timing.
Key
1. ECU
2. Crankshaft position sensor
3. Ignition coil
4. Intake air temperature sensors
5. Pressure sensor
6. Coolant temperature sensor
Workshop Manual Ed. 03-2012
M.33