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Suzuki GSX-R 1000 Service Manual: Dtc c36 (p1764), c37 (p1765), c38 (p1766) or c39 (p1767): secondary fuel injector circuit malfunction

Suzuki GSX-R 1000 Service Manual / Engine / Engine general information and diagnosis / Diagnostic information and procedures / Dtc c36 (p1764), c37 (p1765), c38 (p1766) or c39 (p1767): secondary fuel injector circuit malfunction

Detected condition and possible cause

Detected condition

Possible cause

Some failure exists in the fuel injector signal in a high load, high revolution condition.
  • Injector circuit open or short.
  •  Injector 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 secondary fuel injector coupler (1) for loose or poor contacts.

    If ok, then measure the injector resistance.


  1. Disconnect the injector coupler and measure the resistance between terminals.

Special tool
(a): 0990025008 (multi
circuit tester set)

Tester knob indication resistance (Ω)

Injector resistance 11 13 Ω at 20 c (68 f) (terminal terminal)


  1. If ok, then check the continuity between each terminal and ground.

Special tool
(a): 0990025008 (multi
circuit tester set)

Injector continuity ∞Ω (infinity)


Are the resistance and continuity ok?

Go to step 2. Replace the injector with a new one. Refer to throttle body disassembly and assembly in section 1d .

2

  1. Turn the ignition switch on.
  2.  Measure the injector voltage between the y/r wire and ground.
Note

injector voltage can be detected only for 3 seconds after ignition switch is turned on.

Special tool
(a): 0990025008 (multi
circuit tester set)

Tester knob indication voltage ( )


Injector voltage battery voltage ((+) terminal: y/r () terminal: ground)


Is the voltage ok?

  • Lg wire open or shorted to ground, or poor 59 connection (#1 cylinder side).
  •  Lg/w wire open or shorted to ground, or poor 58 connection (#2 cylinder side).
  •  Lg/b wire open or shorted to ground, or poor 57 connection (#3 cylinder side).
  •  Lg/bl wire open or shorted to ground, or poor 56 connection (#4 cylinder side).
  •  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 .
Open circuit in the y/r wire.
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Detected condition and possible cause Detected condition Possible cause C40/P0505 The circuit voltage of motor drive is unusual. Isc valve circuit open or ...

Other materials:

Rear seat
The seat lock is located under the left frame cover. To remove the rear seat, insert the ignition key into the lock and turn it clockwise. Raise the front end of the seat and slide it forward. To reinstall the seat, slide the seat hooks into the seat hook retainers and push down firm ...

Special tools and equipment
Recommended service material Note required service material is also described in the following. Throttle body components  engine bottom side assembly Special tool ...

Engine coolant
Coolant level The engine coolant solution should be between "f" (full) and "1..:' (Low) level lines on the engine coolant reservoir. If the level is lower than "1..:' (Low) level line, bring it up to "f" (full) level by adding 50:50 mixture of distilled water ...

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