4.3.9 O2-SENSOR TESTER Function
•
Set rotary switch to
mA A
.
•
Insert red (
) test lead into
mA A
jack and black (
) test lead
into COM input jack..
•
Defaults at DC. Press SELECT button momentarily to select AC.
•
Connect the test leads as shown and observe the digital display.
4.3.10
ALTERNATOR TESTER Function
•
Set rotary switch to O2 -Sensor position.
•
Insert red (
) test lead into
jack and black (
) test lead into
COM input jack.
•
Connect test leads to the O2 sensor dynamic output and observe
the digital display.
•
The main digital display shows a symbolic waveform of the O2
sensor dynamic output.
•
The secondary digital display shows the cross count per second
parameter, and a beep sound will alert the user on each cross
count edge being detected. Nominal cross count number is 1 to
3 for a good O2 sensor. The higher the cross count number, the
more active the O2 sensor is.
4.3.9 mA and A Functions
CAUTION
: Do not measure any circuit that draws more than
the current rating of the protection fuse. If the fuse
blows, replace it with the proper fuse. Failure to
do this may result in injury or damage to the meter.
Do not attempt a current measurement where the
open circuit voltage is above 600V. Suspected
open circuit voltage must be checked with voltage
functions. Voltage output current clamp adaptors
are recommended to use with the meter voltage
functions for making high current measurements.
•
Set rotary switch to
•
Insert red (
) test lead into
jack and black (
) test lead into
COM input jack.
•
Start the engine and operate it at about 2000 rpm.
•
Connect the test leads as shown and observe the digital display.
•
A reading of 0.45V (typical) or less indicates that the alternator and
the associated recti
fi
er diodes are in good condition, and ‘good’ will
be displayed on the LCD. A display ‘bad’ together with continuous
beep sound indicate any of the following faults may exist:
- Defective recti
fi
er diode(s).
- Defective Alternator coils.
- Opened coil or recti
fi
er connections.
- Neutral of 3-phase Y-connection alternator accidentally
grounded to chassis.
4.3.11
FAULT CODE DETECTOR Function
•
Set rotary switch to
DTC-Decoder.
•
Default at
. Press SELECT button momentarily to select
•
Insert red (
) test lead into
jack and black (
) test lead into
COM input jack.
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