Yamaha YP250A 1999 Supplementary Service Manual page 54

[B-5] MALFUNCTION CHECK BY THE ABS SELF DIAGNOSIS (PRESENT MALFUNCTION)
NOTE:
Before proceeding to [B-5], read the part of [B-3] "Arrangement and the function of test coupler".
Remove the screen and check the location of test connector. Connect the test coupler adapter with the test
connector in order to ground the T/C terminal (sky-blue). (Figure - A )
A
Test connector
Lock plate
T/C terminal
T/F terminal
Light terminal
(white/red)
B
Set the range of pocket tester to DC20V. Connect the negative (-) terminal of tester to the T/F terminal (light
green) and positive (+) terminal to the positive (+) terminal of battery. (Figure - B )
Read the tester indication. (Figure - C )
As an example, "10 digits/1 digit pattern" of tester reading is shown below.
This example is the pattern which
shows malfunction code 12.
8 V
0 V
Time
(second)
ANTI-LOCK BRAKE SYSTEM (ABS)
Protective cap
Grounding
(black)
(white/red)
(light green)
Test coupler
adapter
(light green)
(white/red)
C
This example is the pattern which
shows malfunction code 21.
46
CHAS