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16-12
Special
patterns
Alternator
pickup
B terminal
STANDARD WAVEFORM
Observation Conditions
FUNCTION
PATTERN HEIGHT
VARIABLE knob
PATTERN SELECTOR
Engine speed
0.4
0.2
Voltage at
0
alternator
B terminal
– 0.2
– 0.4
ENGINE ELECTRICAL –
WAVEFORM CHECK USING AN ANALYZER
Analyzer
MEASUREMENT METHOD
Connect the analyzer special patterns pick-up to the alternator
B terminal.
SPECIAL PATTERNS
VARIABLE
Adjust while viewing the wave-
form.
RASTER
Curb idle speed
NOTE
The voltage waveform of the alternator B terminal can undulate
as shown at left. This waveform is produced when the regulator
operates according to fluctuations in the alternator load
(current), and is normal for the alternator.
In addition, when the voltage waveform reaches an excessively
high value (approx. 2 V or higher at idle), it often indicates
an open circuit due to a brown fuse between alternator B
terminal and battery, but not a defective alternator.
Charging System
16100120211
Time
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