Engine General Information and Diagnosis: 1A-131
DTC “C91” (P0500): Vehicle Speed Sensor Circuit Malfunction
B947H11104033
Detected Condition and Possible Cause
Wiring Diagram
ECM coupler (Harness side)
Troubleshooting
CAUTION
!
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a
needle pointed tester probe to prevent terminal damage.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures” (Page 1A-14).
Detected Condition Possible Cause
Speedometer does not receive signal from the vehicle
speed sensor for more than 6 sec. when the motorcycle is
running. ECM does not receive signal from the vehicle
speed sensor for more than 6 sec. when the motorcycle is
running. Failure in communication between ECM and
speedometer with reference to vehicle speed.
• Speed sensor circuit open or short.
• Speed sensor malfunction.
• Speedometer malfunction.
• ECM malfunction.
ECM
B/W
B/R
P
Speed sensor
Speed sensor
To Speedometer
B/W
B/R
B
2
I837H1110116-01
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I837H1110007-02
Manuals by Motomatrix / The Solution For Lost Motorcycle Coded Keys
email: info@motomatrix.co.uk / www.motomatrix.co.uk
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