[C] Supposing The Malfunction Cause And Position; [C-1] Only Abs Warning Light Does Not Go On When The Main Switch Is Turned On - Yamaha YP250A 1999 Supplementary Service Manual

[C] SUPPOSING THE MALFUNCTION CAUSE AND POSITION

[C-1] ONLY ABS WARNING LIGHT DOES NOT GO ON WHEN THE MAIN SWITCH IS TURNED ON

NOTE:
Check following the numbers in sequence.
1. Visual check
1) Check the fuse 1 . (ABS)
Check the cause of fuse blown, repair and replace with a new one.
2) Check the ABS harness and wire harness connector.
Check whether the ABS connector is securely connected with the wire harness. Both harnesses are con-
nected by two connectors. Check both connectors. (Refer to ABS CONNECTOR LOCATION CHART)
3) Check the connection of ECU and ABS harness.
Check whether the ABS harness is securely connected with the ECU. (Refer to ABS CONNECTOR
LOCATION CHART)
2. Confirmation by the test coupler adapter
1) Connect the test coupler and test coupler adapter. (Refer to [B-5])
2) Connect the warning light terminal (white/red) of test coupler adapter to the ground (or the negative (-)
terminal of battery).
S If the ABS warning light goes on, the inside of ABS harness may be disconnected.
S If the ABS warning light does not goes on, the ABS warning light lead may be disconnected or the warn-
ing light's contact may be defective.
3) Remove the ECU connector (Refer to ABS CONNECTOR LOCATION CHART) and check the continuity
of white/red lead. (ECU and test coupler adapter sides of white/read wire)
S If there is a continuity, the ECU is defective. ! Replace the ECU. (Refer to [D-1] MAINTENANCE OF
ECU)
S If there is no continuity, the warning light circuit in the ABS harness is defective. Disconnection and oth-
ers ! Correct (Refer to CIRCUIT DIAGRAM)
ANTI-LOCK BRAKE SYSTEM (ABS)
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CHAS