VOLTAGE REGULATION TABLE
| INSPECTION TERMINAL | VOLTAGE REGULATOR AMBIENT TEMPERATURE [°C (°F)] | STANDARD VALUE (V) |
|---|---|---|
| Terminal "S" | 20 (--4) | 14.2 - 15.4 |
| 20 (68) | 13.9 - 14.9 | |
| 60 (140) | 13.4 - 14.6 | |
| 80 (176) | 13.1 - 14.5 |
VOLTAGE REGULATION SPECIFICATION
MEASUREMENT METHOD
Connect the oscilloscope special patterns pick-up to the generator "B" terminal.
Scheme 29
STANDARD WAVEFORM
| Observation Conditions | |
|---|---|
| FUNCTION | SPECIAL PATTERNS |
| Pattern height | Variable |
| Variable knob | Adjust while viewing the wave pattern |
| Pattern selector | Raster |
| Engine revolutions | Curb idle speed |
STANDARD WAVEFORM CHART
Scheme 30
Scheme 31
Note. The voltage waveform of the generator "B" terminal can undulate as shown in illustration. This waveform is produced when the regulator operates according to fluctuations in the generator load (current), and is normal for the generator. If the ripple height is abnormally high (approximately 2 V or more during idling), the wires between the generator "B" terminal and the battery have broken due to fuse blowing, etc. The generator is usually operating properly.
ABNORMAL WAVEFORMS EXAMPLES
Note. The size of the waveform patterns can differ greatly, depending on the adjustment of the variable knob on the oscilloscope.
Note. Identification of abnormal waveforms is easier when there is a large output current (regulator is not operating). (Waveforms can be observed when the headlights are illuminated.)
Note. Check the conditions of the generator malfunction light (illuminated/not illuminated) also, and carry out a total check.
Scheme 32
Scheme 33
Scheme 34
Scheme 35
- Example 1 PROBABLE CAUSE: Open circuit or short circuit in diode
- Example 2 PROBABLE CAUSE: Open circuit in stator coil (In stator coil)
- Example 3 PROBABLE CAUSE: Open circuit in stator coil (Open circuit between stator coil and diode)
- Example 4 PROBABLE CAUSE: Short circuit in stator coil
