C32", "C33", "C34" Or "C35" Fuel Injection Malfunction - Suzuki GSX-R750 Service Manual

"C32", "C33", "C34" or "C35" FUEL INJECTION MALFUNCTION

DETECTED CONDITION
No injector current.
INSPECTION
• Lift and support the fuel tank with its prop stay. ( 4-51)
1
Turn the ignition switch OFF.
Check the injector coupler for loose or poor contacts.
If OK, then measure the injector resistance.
Disconnect the coupler and measure the resistance be-
tween terminals.
Injector resistance: 11 – 16 Ω Ω Ω Ω Ω at 20°C (68°F)
If OK, then check the continuity between each terminal
and ground.
Injector continuity: ∞Ω
[ 09900-25008: Multi circuit tester
U Tester knob indication: Resistance (Ω Ω Ω Ω Ω )
Yes
2
Turn the ignition switch ON.
Measure the injector voltage between Y/R wire and
ground.
Injector voltage: Battery voltage
NOTE:
Injector voltage can be detected only 3 seconds after ig-
nition switch is turned ON.
[ 09900-25008: Multi circuit tester
V Tester knob indication: Voltage (
Yes
Gr/W, Gr/B, Gr/Y, Gr/R or Y/R wire open or shorted to ground,
or poor 4, 5, 6, 7 or b connection. ( 4-25)
If wire and connection are OK, intermittent trouble or faulty ECM.
Recheck each terminal and wire harness for open circuit and
poor connection. ( 4-4)
(Terminal – Terminal)
∞Ω (Infinity) ∞Ω ∞Ω ∞Ω
(Terminal – Ground)
No Replace the injector with
a new one. ( 4-75)
(Y/R – Ground)
)
No Open circuit in the Yellow/
Red wire.
Replace the ECM with a new one,
and inspect it again.
FI SYSTEM AND INTAKE AIR SYSTEM 4-49
POSSIBLE CAUSE
• Injector circuit open or short.
• Injector malfunction.
• ECM malfunction.
1
Ground Ground
2
V
Y/R Y/R
Ground Ground
ECM couplers