SAAB WIS ONLINE

Starter motor

Starter motor


The starter motor has permanent magnets to reduce strain on the battery.

A planetary gear increases the starting torque.

The starter motor circuit consists of two sub-circuits:


• the working circuit, and;

• the operating circuit.


Working circuit

The working circuit runs from the battery's positive terminal to terminal 30 on the starter motor.


Operation

When the correct ignition key is put in the ignition, the transponder sends a code to TWICE which grounds the starting relay actuating coil.

When the ignition is turned to the start position, the starting relay is activated and the operating circuit to solenoid terminal 50 closes. The solenoid engages the pinion with the ring gear on the engine flywheel and closes a switch so that the starter motor commutator is supplied with power via the slip brushes from terminal 30.

Once the engine has started and the engine speed has exceeded the starter motor rpm, the pinion is disengaged from its shaft via a free wheel, preventing the starter motor from overrevving. Releasing the ignition key breaks the starting circuit and the operating circuit to the solenoid, whereby a spring returns the pinion to its rest position.

Warning

Nothing may be connected to the circuit between the generator and the battery. Spikes of up to 100V can occur.


Operating circuit for manual gearbox


The operating circuit runs from the battery's positive terminal to the ignition switch and on to the starting relay, and via the starting relay to terminal 50 on the starter motor, which is the operating current connection on the solenoid.

The clutch pedal must be depressed on cars for the US/CA market if the starter relay contacts are to receive current.

The starting relay actuating coil is grounded via the TWICE control module when it has received the ready signal from the immobilizer unit.

Warning

Nothing may be connected to the circuit between the generator and the battery. Spikes of up to 100V can occur.


Operating circuit for automatic transmission


The operating circuit runs from the battery's positive terminal to the ignition switch and on to the starting relay, and via the starting relay to terminal 50 on the starter motor, which is the operating current connection on the solenoid.

The selector lever must be in position P or N if the starting relay coil is to receive current.

The starting relay actuating coil is grounded via the TWICE control module when it has received the ready signal from the immobilizer unit.

Warning

Nothing may be connected to the circuit between the generator and the battery. Spikes of up to 100V can occur.