XC90 L5-2.5L Turbo VIN 59 B5254T2 (2004)
The control solenoid has two functions. The first is to mechanically engage the pinion in the flange/flywheel gear collar. The other is to function as a
relay and to handle the greater current required to drive the starter motor when the pinion engages with the gear collar.
The control solenoid consists of the following components:
1. Moving steel cores. Moved by pull-in winding in the control solenoid, slides the pinion into position and moves the moving switch towards the
fixed switches
2. Pull-in winding. Pull in the moving steel core. Disconnect when the moving steel core reaches the bottom position
3. Hold-in winding. Holds the moving steel core in position for as long as the control solenoid is supplied
4. Fixed steel cores. Stop position for the moving steel core
5. Contact spring
6. Fixed contacts. Closes when the moving switches reach the fixed switches
7. Terminals. One for the battery and one for the DC motor
8. Moving switch. Switch which closes the fixed switches
9. Moving shaft. Affected by the moving steel core and connects the moving switches with the fixed switches
10. Return spring. Resets the control solenoid components to the rest position when the starter motor relay is disconnected.
Freewheel
Functions as a one way clutch (freewheel). The freewheel allows the starter motor to drive the car engine, but not the other way around. This prevents the
starter motor from being over-revved. This is carried out by spring-loaded rollers which lock the pinion and gear together when the starter motor
operates.
