Yamaha XP500 Service Manual page 299

EAS00887
ABS troubleshooting
• [A] ABS malfunction check using the ABS warning light
Set the main switch to "ON". (Do not start the engine.)
1) Warning light does not come on.
2) Warning light remains on.
3) Warning light flashes.
4) Warning light comes on for 2 seconds, then goes off.
• [B] Detailed ABS malfunction check
• [B-1] Warning light does not come on
Do other indicators operate normally?
1) Yes.
2) No.
• [B-2] ABS warning light remains on
Check the ECU (ABS) and is located on the right side of the vehicle near the top of the front fork. Is
the coupler connected securely?
1) Yes.
2) No.
• [B-3] Warning light flashes
NOTE:
_
Check the battery voltage before proceeding.
Check the test coupler located in the front cowling. Is the T/C terminal grounded?
1) Yes. → Disconnect the grounding lead from the T/C terminal and install the protective cap
onto the test coupler.
NOTE:
_
When the test coupler adaptor is connected to test coupler, the T/C terminal is grounded.
2) No.
Function of the test coupler terminals
• The ABS self-diagnostic function of the ECU (ABS) is operated when the T/C terminal is
grounded.
• The malfunction codes stored in the memory of the ECU (ABS) are recalled and output (rise
and fall of voltage) at the T/F terminal.
• The ABS warning light terminal is used to check the ABS warning light circuit.
• To ground the T/C terminal, connect the test coupler adaptor to the test coupler.
T/C (sky blue)
T/F (light green)
Test coupler
ANTI-LOCK BRAKE SYSTEM (XP500A)
→ Connect the coupler securely until a "click" sound is heard.
Grounding (black)
ABS warning light (white/red)
4 - 101
CHAS
→ [B-1]
→ [B-2]
→ [B-3]
→ [B-4]
→ [C-1]
→ [C-2]
→ [B-5]
→ [C-3]
Test coupler adaptor