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Suzuki GSX-R 1000 Service Manual: DTC “c28” (p1655): secondary throttle valve actuator (stva) malfunction

Suzuki GSX-R 1000 Service Manual / Engine / Engine general information and diagnosis / Diagnostic information and procedures / DTC “c28” (p1655): secondary throttle valve actuator (stva) malfunction

Detected condition and possible cause

Detected condition

Possible cause
The operation voltage does not reach the stva.

Ecm does not receive communication signal from the stva. Stva can not operate properly or its motor locked
  • Stva malfunction.
  •  Stva circuit open or short.
  •  Stva motor 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. Lift and support the fuel tank. Refer to “fuel tank removal and installation” in section 1g .
  2.  Remove the air cleaner box cover. Refer to “air cleaner element removal and installation” in section 1d .
  3.  Check the stva lead wire coupler (1) for loose or poor contacts.


  1. Check whether the stvs open by turning the ignition switch on.


Is the operation ok?

 Go to step 2.
  • Loose or poor contacts on the stva coupler.
  •  Open or short circuit in the b/lg, p/w, g or w/b wire.
  •  If wire and connection are ok, go to step 2.
2
  1. Turn the ignition switch off.
  2.  Disconnect the stva lead wire coupler.
  3.  Check the continuity between each terminal and ground.

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

Tester knob indication resistance (Ω)

Stva continuity ∞Ω¶ (infinity) (terminal . Ground)


  1. If ok, then measure the stva resistance (between the p wire “a” and b wire “b”) and (between the w/b wire “c” and g wire “d”).

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

Stva resistance approx. 6.5 Ω (terminal “a” – terminal “b”, terminal “c” – terminal “d”)
  • B/lg, p/w, g and w/ b wire open or shorted to ground, or poor “3”, “4”, “27” and “28” connection.
  •  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 .
  • Loose or poor contacts on the ecm coupler.
  •  Replace the throttle body assembly with a new one. Refer to “throttle body disassembly and assembly” in section 1d .

Active control inspection

  1. Set up the sds tool. (Refer to the sds operation manual for further details.)
  2.  Turn the ignition switch on.
  3.  Click “secondary throttle operating control” (1).

Suzuki GSX-R. Active control inspection


  1. Click each button (2).

    At this time, if an operation sound is heard from the stva, the function is normal.

Suzuki GSX-R. Active control inspection


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DTC “c29” (p1654-h/l): secondary throttle position sensor (stps) circuit malfunction
Detected condition and possible cause Detected condition Possible cause C29 Output voltage is not within the following range. Difference between actual throttle op ...

Other materials:

Starter motor removal and installation
Removal Turn the ignition switch off and disconnect the battery (–) lead wire (1).  Lift and support the fuel tank. Refer to “fuel tank removal and installation” in section 1g (page 1g- 9).  Disconnect the starter motor lead wire (2).  Remove the starter motor (3). ...

Air cleaner element inspection
Inspect air cleaner element every 6 000 km (4 000 miles, 12 months) Inspection Remove the air cleaner element. Refer to “air cleaner element removal and installation” in section 1d .  Inspect the air cleaner element for clogging. If it is clogged with dirt, replace it with a new on ...

Brake pad
Front Rear Inspect the front and rear brake pads to see if they are worn down to the grooved wear limit line 1. If a pad is worn to the grooved wear limit line, it must be replaced with a new one. After replacing either the front or rear brake pads, the brake lever or pedal must be ...

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