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:

Body frame construction
Frame Seat rail Seat rail bolt Collar Engine mounting thrust adjuster Engine mounting thrust adjuster lock-nut Engine mounting pinch bolt 50 N·m (5.0 Kgf-m, 36.0 Lbf-ft) 23 N·m (2.3 Kgf-m, 16.5 Lbf-ft) 45 N·m (4.5 Kgf-m, 32. ...

Immobilizer description (for e-02, 19, 24, 51)
The immobilizer, an anti-theft system, is installed as a standard equipment. The immobilizer verifies that the key id agrees with ecm id by means of radio communication through the immobilizer antenna. When the id agreement is verified, the system makes the engine ready to start. ...

Iat sensor inspection
Refer to “dtc “c21” (p0110-h/l): iat sensor circuit malfunction” in section 1a . Inspect the iat sensor. Note iat sensor resistance measurement method is the same way as that of the ect sensor. Refer to “ect sensor inspection” (page 1c- 4). Caution & ...