Fuel Injector Inspection; Fuel Injector Removal - Suzuki GSX-R750 Service Manual

To set the ST valve to fully open position, apply 12 volts to A and
B terminals.
Positive wire ––– B (Gray wire) terminal
Negative wire ––– A (Pink wire) terminal
#
To prevent the motor damage, stop to apply 12V as soon
as the ST valve reaches to fully open position.
Measure the position sensor output voltage at fully open posi-
tion.
Position sensor output voltage
ST valve is fully open: less than 4.8 V
If the measured voltage is more than specification, adjust the No.1
cable adjuster as follows:
• Set the ST valve to adjustment position. (4-61)
#
Adjusting the No.1 cable with the ST valve fully opened
can damage the STV actuator. Be sure to adjust the No.2
cable with the ST valve set in adjustment position.
• Turn out the No.1 cable adjuster 1 until the output voltage be-
comes specified value.
Position sensor output voltage
ST valve is fully open: 4.2
• Repeat the above procedure until the output voltage is within
the specified value.
• After adjusting the ST control cables, perform 4th step to con-
firm C28 is not indicated.

FUEL INJECTOR INSPECTION

The fuel injector can be checked without removing it from the
throttle body.
Refer to page 4-49 for details.

FUEL INJECTOR REMOVAL

• Lift and support the fuel tank with its prop stay. ( 4-51)
• Remove the air cleaner box. ( 4-61 and -62)
• With battery negative cable disconnected, disconnect the in-
jector couplers.
• Remove the fuel delivery pipe assembly. ( 4-66)
• Remove the fuel injectors No.1, No.2, No.3 and No.4.
( 4-66)
INSPECTION
Check fuel injector filter for evidence of dirt and contamination. If
present, clean and check for presence of dirt in the fuel lines and
fuel tank.
(+ Yellow – - B/Br)
output voltage 4.8 V
FI SYSTEM AND INTAKE AIR SYSTEM 4-75
Pink Pink
Gray Gray
12 V