Generators & Regulators: Other Scion xA I

BELT TENSION

Generator is used to adjust proper tension on serpentine drive belt. For serpentine drive belt routing (Scheme 4) Check drive belt tension using a belt tension gauge. (Scheme 5) For belt tension specifications, see BELT ADJUSTMENT TENSION table. Adjust as necessary.

Scheme 4

Scheme 5

BELT ADJUSTMENT TENSION

BRUSHES

1. Brushes should slide smoothly in holders. Replace brushes if damaged or worn. See «GENERATOR SPECIFICATIONS»(ref-168933-S18127179822004112200000) .
2. If exposed brush length is less than minimum, replace brushes and brush holder assembly. Install new brush springs when replacing brushes.

DIODES

1. With diode/rectifier assembly removed and on bench, contact positive diode plate terminal with one ohmmeter probe. Using other ohmmeter probe, contact each diode lead in same plate. Note ohmmeter reading. Reverse ohmmeter probes, and repeat tests for all diodes.
2. All diodes should show continuity in one direction and no continuity in opposite direction. If any diode is defective, replace diode/rectifier assembly.

ROTOR

1. Check rotor for open field windings by using an ohmmeter across slip rings. Rotor resistance should be within specification. See «GENERATOR SPECIFICATIONS»(ref-168933-S18127179822004112200000) .
2. Check rotor for shorts to ground by connecting ohmmeter between slip ring and rotor shaft. Ohmmeter should indicate no continuity. Check slip rings for wear or pitting. See «GENERATOR SPECIFICATIONS»(ref-168933-S18127179822004112200000) . If slip rings are rough or scored, replace rotor.

STATOR

Connect ohmmeter between 2 stator leads. Continuity should exist between all stator leads. Connect ohmmeter between each stator lead and metal core. Continuity should not exist. If stator does not test as indicated, replace stator.

VOLTAGE REGULATOR

Note. When positive and negative probes between terminals are exchanged, there is continuity in one direction but not in the other direction.

Using ohmmeter, check for continuity between following

1. Terminals "F" and "B"
2. Terminals "F" and "E"

If continuity is not as specified, replace voltage regulator. See

(Scheme 6)

Scheme 6

Scheme 7

1. Disconnect negative battery cable.
2. Remove battery nut and wire from generator.
3. Disconnect generator wire harness connector.
4. Remove wire harness clamp.
5. Loosen both generator mounting bolts.
6. Release serpentine drive belt tension, and remove belt.
7. Remove both generator mounting bolts. If necessary, remove serpentine belt adjusting bar. (Scheme 7)
8. Remove generator.
9. To install, reverse removal procedure. Install serpentine drive belt. For belt routing (Scheme 4) Adjust belt tension by moving generator. See «BELT TENSION»(ref-168933-S35435235182004112200000) under ADJUSTMENTS. Tighten generator bolts to specification. See «TORQUE SPECIFICATIONS»(ref-168933-S37121453482004112200000).