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

Turn the ignition switch off.
Lift and support the fuel tank. Refer to “fuel tank removal and installation” in section 1g .
Check the secondary fuel injector coupler (1) for loose or poor contacts.

If ok, then measure the injector resistance.

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)

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?

Go to step 2.

Replace the injector with a new one. Refer to “throttle body disassembly and assembly” in section 1d .

Turn the ignition switch on.
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): 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 .

Open circuit in the y/r wire.

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Other materials:

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Seal set Piston and seal set Brake pad spring Brake pad set Front brake disc 7.5 N·m (0.75 Kgf-m, 5.5 Lbf-ft) 15 N·m (1.5 Kgf-m, 11.0 Lbf-ft) 39 N·m (3.9 Kgf-m, 28.0 Lbf-ft) 18 N·m (1.8 Kgf-m, 13.0 Lbf-ft) Apply thread lo ...

Short circuit check (wire harness to ground)
Disconnect the negative (–) cable from the battery. Disconnect the connectors/couplers at both ends of the circuit to be checked. Note if the circuit to be checked branches to other parts as shown, disconnect all connectors/ couplers of those parts. Otherwise, diagnos ...

Body frame construction
Frame Seat rail Seat rail bolt Collar Engine mounting thrust adjuster Engine mounting thrust adjuster lock-nut Engine mounting pinch bolt 50 N·m (5.0 Kgf-m, 36.0 Lbf-ft) 23 N·m (2.3 Kgf-m, 16.5 Lbf-ft) 45 N·m (4.5 Kgf-m, 32. ...