Suzuki GSX-R 1000 Quiz
Engine

DTC “c31” (p0705): gp switch circuit malfunction

In this manual: Engine
Foreword — 1Precautions — 15General information — 44Engine — 269Suspension — 52Driveline / axle — 13Brake — 51Transmission / transaxle — 34Steering — 15Body and accessories — 68
9steps
~54min
2/5difficulty
Done 0 of 9
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): 09900–25008 (multi circuit tester set) (b): 09900–25009 (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).

Test yourself

A quick Suzuki GSX-R 1000 quiz: every answer comes with an explanation and a link to the manual page.