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Suzuki GSX-R 1000 Service Manual: DTC c91 (p0500): vehicle speed sensor circuit malfunction

Detected condition and possible cause

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.

Wiring diagram

Suzuki GSX-R. Wiring diagram


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 .

 

Step

Action

Yes

No

1

  1. Turn the ignition switch off.
  2.  Lift and support the fuel tank. Refer to fuel tank removal and installation in section 1g .
  3.  Check the speed sensor coupler (1) for loose or poor contacts.

    If ok, remove the speed sensor. Refer to speed sensor removal and installation in section 9c .


  1. Connect 12 v battery, 10 kΩ resistor and the multi-circuit tester as shown in the figure.

Special tool
(a): 0990025008 (multi
circuit tester set)

Tester knob indication voltage ( )



  1. Under this condition, if a suitable screwdriver touching the pick-up surface of the speed sensor is moved, the tester reading voltage changes (0 v → 12 v or 12 v → 0 v). If the tester reading voltage does not change, replace the speedometer sensor with a new one.
Note

while testing, the highest voltage reading should be the same as the battery voltage (12 v).


Is the voltage ok?

  • P wire open or shorted to ground.
  •  Loose or poor contacts on the speed sensor coupler or ecm coupler (terminal 2).
  •  If wires and connection are ok, intermittent trouble or faulty ecm.
  •  Recheck each terminal and wire harness for open circuit and poor connection.
  •  Replace the ecm with a known good one, and inspect it again.
  • Inspect that metal particles or foreign material stuck on the speed sensor and rotor tip.
  •  If there are no metal particles and foreign material, then replace the speed sensor with a new one.
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