Toyota RAV4 manuals

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): 0990025008 (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): 0990025008 (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


DTC c23 (p1651-h/l): to sensor circuit malfunction
Detected condition and possible cause Detected condition Possible cause C23 The sensor voltage should be the following for 2 sec. And more, after ignition switch i ...

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:

Special tools and equipment
Recommended service material Note required service material is also described in the following. Drive chain related components Special tool ...

Engine oil and filter change
Change the engine oil and oil filter at the scheduled times. The engine should always be warm when the oil is changed so the oil will drain easily. The procedure is as follows:  Place the motorcycle on the side stand. Remove the three screws of the right fairing 1. ...

Engine oil level check
Check the engine oil level as follows:  Place the motorcycle on level ground on the side stand.  Start the engine and allow it to idle for a few minutes.  Stop the engine and wait three minutes. Hold the motorcycle vertically and check the oil level through ...

2011-2017 Copyright www.suzukigsxr.org