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

Detected condition

Possible cause

• Injector circuit open or short.
•  Injector malfunction.
•  Ecm malfunction.

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.

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.

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

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

Tester knob indication resistance (Ω)

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

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

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

Injector continuity ∞Ω¶ (infinity)

Are the resistance and continuity ok?

2

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

Special tool
(a): 09900–25008 (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 .