Charging System - V6: Overview Saab 9-3 II

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1. Remove the battery cover and disconnect the negative battery cable.
2. DTH Remove the upper engine cover and insulation.
3. DT: Remove the generator's upper retaining bolt. DTH Remove the generator's two upper retaining bolts.
4. Raise the car.
5. Remove the lower engine cover.
6. Remove the front right wheel.
7. Remove the right-hand «Front wing liner»(ref-275838-S09185847162007122900000) .
8. Release the load of the belt tensioner and lock it with «87 92 335 LOCK PIN»(ref-275860-S05205500162007122900000) .
9. Lift the poly-v-belt off the alternator. IMPORTANT: Make a note of the belt's direction of rotation. The belt must be refitted for the same direction of rotation as previously.
10. Remove the bolt from the steering swivel member, lower the suspension arm and place a «83 95 238 WEDGE»(ref-275860-S14668217372007122900000) between the suspension arm and the anti-roll bar.
11. Tap the drive shaft out of the intermediate shaft with a brass drift and large hammer. Move aside the drive shaft. WARNING: Use protective goggles to protect against flying splinters of metal.
12. Remove the generator's electrical connections (ring terminals).
13. DT: Remove the lower bracket. DTH: Remove the generator's lower retaining bolt.
14. Lower the alternator and lift it out.

Generator, description of operation

When the engine starts, the engine control module (ECM) sends a signal to the generator connection L. The generator connection L is coupled to the magnetization winding, which means that the generator begins to charge. To maintain the charge, the engine control module continuously sends out a signal to connection L.

Scheme 162

When the rotor in the generator rotates, the magnetic field around the rotor will also rotate and thereby generate an AC voltage in the stator winding. This AC voltage is rectified when it passes the diodes and is then supplied to the car's electrical system via B+. The voltage obtained from the stator winding also passes to the voltage regulator and affects its regulating function. When the voltage exceeds the nominal value (approx. 14V), the voltage regulator will reduce the current through the magnetization winding. The magnitude of the magnetic field will be reduced, as will the AC voltage generated in the stator winding. When the voltage has dropped below the nominal value, the magnetization current will increase again, the magnetic field will increase and thereby the charge.

If the engine idle speed falls below the programmed speed, the signal from the engine control module to the connection L is broken. This means that the generator does not receive any magnetization and does not charge. The engine load is reduced and the risk of stalling avoided.

Connection L is also the diagnostic lead from the generator to the engine control module. If the generator does not charge, an indicator will be displayed on SID and the engine control module will generate a diagnostic trouble code.

Generator connection F in cars with petrol engine B207 or B284 provides information to the engine control module regarding generator load, i.e. how much it is charging, so that the engine management system can correct engine torque and thereby prevent engine speed to change due to different generator loads.

Generator connection F is not used in cars with diesel engine or petrol engine Z18XE.