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Suzuki GSX-R 1000 Service Manual: DTC c31 (p0705): gp switch circuit malfunction

Detected condition and possible cause

Detected condition

Possible cause

No gear position switch voltage Gp switch voltage is not within the following range.

Gp switch voltage > 0.6 V

  • Gp switch circuit open or short.
  •  Gp switch 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 gp switch coupler (1) for loose or poor contacts.

    If ok, then measure the gp switch voltage.


  1. Support the motorcycle with a jack.
  2.  Fold the side-stand to up position.
  3.  Make sure the engine stop switch is in the run position.
  4.  Insert the needle pointed probe to the lead wire coupler.
  5.  Turn the ignition switch on.
  6.  Measure the voltage between the p and b/w wire, when shifting the gearshift lever from 1st to top.

Special tool
(a): 0990025008 (multi circuit tester set) (b): 0990025009 (needle-point probe set)

Tester knob indication voltage ( )

Gp switch voltage 0.6 V and more ((+) terminal: p () terminal: b/w)


Is the voltage ok?

  • P wire open or shorted to ground.
  •  If wire 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. Refer to ecm removal and installation in section 1c .
  • P or b/w wire open, or p wire shorted to ground.
  •  Loose or poor contacts on the ecm coupler.
  •  If wire and connection are ok, replace the gp switch with a new one. Refer to gear position (gp) switch removal and installation in section 5b (page 5b- 14).
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