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

Suzuki GSX-R 1000 Service Manual / Engine / Engine general information and diagnosis / Diagnostic information and procedures / 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

Turn the ignition switch off.
Lift and support the fuel tank. Refer to “fuel tank removal and installation” in section 1g .
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 .

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

Special tool
(a): 09900–25008 (multi
circuit tester set)

Tester knob indication voltage ( )

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:

Cam chain guide / cam chain tensioner removal and installation
Removal Remove the cylinder head cover. Refer to “engine top side disassembly” . Remove the cam chain guide no. 2 (1). Remove the cylinder head. Refer to “engine top side disassembly” and “engine bottom side disassembly” . Remove the starter clutch. Refer to “s ...

Drive chain
This motorcycle has a master link type drive chain. We recommend that you take your motorcycle to an authorized suzuki dealer if the drive chain needs replacing. The condition and adjustment of the drive chain should be checked each day before you ride. Always follow the guidelines for ins ...

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 ...