Actron CP9087 - Manual (Page 86)

Section 4
4-4
Diode Checks
Tests diodes and rectifiers for proper operation.
1) Set RANGE switch to HIGH.
2) Set FUNCTION switch to OHMS.
3) Connect TEST leads as shown in Figure 1.
( YELLOW to anode — BLACK to cathode)
4) The bottom TEST light should be ON. If a
different TEST light is on or all lights are off, the
diode is defective.
5) Reverse test lead connections as shown in
Figure 2.
( YELLOW to cathode — BLACK to anode)
6) The top TEST light should be ON. If a different
TEST light is on or all lights are off, the diode is
defective.
Note: Always make sure all connections are good. If
necessary, scrape away corrosion, paint, etc. at the
contact points.
FUNCTION
VOLTS
OHMS
FREQUENCY
RANGE
HIGH
LOW
POWER OFF
TEST TEST
Yellow Black
Fig. 2 Fig. 1
Black Yellow