Toyota RAV4 manuals

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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Other materials:

Fuel injector inspection and cleaning
Inspect the fuel injector in the following procedures:  remove the fuel injector. Refer to throttle body disassembly and assembly in section 1d .  Check the fuel injector for evidence of dirt and contamination. If present, clean and check for presence of dirt in the fuel lin ...

Ignition switch inspection
Inspect the ignition switch in the following procedures:  remove the air cleaner box. Refer to air cleaner box removal and installation in section 1d .  Disconnect the ignition switch lead wire coupler (1). Inspect the ignition switch for continuity with a tester. If ...

Specifications
Service data Brake unit: mm (in) Tightening torque specifications Note the specified tightening torque is described in the following. Rear brake components Reference: for the tightening torque of fastener not specified in this section, refer to tightening torqu ...

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