Suzuki GSX1400 Service Manual page 308

Secondary throttle
valve actuator
c28
Secondary throttle
position sensor
c29
Gear position signal
c31
Fuel injector signal
c32, c33, c34
or c35
Fuel pump relay
signal
c41
Ignition switch signal
c42
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When no actuator control signal is supplied from ECM or com-
munication signal does not reach ECM or operation voltage does
not reach STVA motor, c28 is indicated. STVA can not operate.
STVA lead wire/coupler.
The sensor should produce following voltage.
(0.20 V sensor voltage < 4.80 V)
Without the above range, c29 is indicated.
Secondary throttle position sensor, wiring/coupler connection.
Gear position signal voltage should be higher than the following
for more than 4 seconds.
(Gear position sensor voltage > 0.60 V)
Without the above value, c31 is indicated.
Gear position sensor, wiring/coupler connection. Gearshift cam
etc.
When fuel injection signal stops, the c32, c33, c34 or c35 is
indicated.
Injector, wiring/coupler connection, power supply to the in-
jector.
When no signal is supplied from fuel pump relay, c41 is indicated.
Fuel pump relay, connecting lead, power source to fuel pump
relay.
Ignition switch signal is not input in the ECM.
Ignition switch, lead wire/coupler.
SERVICING INFORMATION 8-3