Suzuki GSX-R750, Service Manual

Page: 197 / 495

4-50 FI SYSTEM AND INTAKE AIR SYSTEM
“C41” FP RELAY CIRCUIT MALFUNCTION
DETECTED CONDITION POSSIBLE CAUSE
No signal from fuel pump relay. • Fuel pump relay circuit open or short.
• Fuel pump relay malfunction.
• ECM malfunction.
INSPECTION
• Remove the front and rear seats.
• Lift and support the fuel tank with its prop stay. (
4-51)
Turn the ignition switch OFF.
Check the FP relay coupler for loose or poor contacts.
If OK, then check the insulation and continuity. Refer to
page 4-55 for details.
No Replace the FP relay with
a new one.
Yes
Y/B or O/W wire open or shorted to ground, or poor
9
or
G
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)
Replace the ECM with a new one,
and inspect it again.
“C42” IG SWITCH CIRCUIT MALFUNCTION
* Refer to the IGNITION SWITCH INSPECTION for details.
• Remove the right under cowling. (
6-5)
• Inspect the ignition switch. ( 7-39)
1
ECM couplers