Self-Diagnosis Function; User Mode - Suzuki GSX-R750 Service Manual

4-26 FI SYSTEM AND INTAKE AIR SYSTEM

SELF-DIAGNOSIS FUNCTION

The self-diagnosis function is incorporated in the ECM. The function has two modes, "User mode" and
"Dealer mode". The user can only be notified by the LCD (DISPLAY) panel and LED (FI light). To check the
function of the individual FI system devices, the dealer mode is prepared. In this check, the special tool is
necessary to read the code of the malfunction items.

USER MODE

MALFUNCTION
"NO"
"YES"
Engine can start
Engine can not start
*1
When one of the signals is not received by ECM, the fail-safe circuit works and injection is not stopped. In this
case, "FI" and coolant temp. are indicated in the LCD panel and motorcycle can run.
*2
The injection signal is stopped, when the camshaft position sensor signal, crankshaft position sensor signal,
tip over sensor signal , #1/#2, #3 and #4 ignition signals, #1, #2, #3 and #4 injector signals, fuel pump relay
signal or ignition switch signal is not sent to ECM. In this case, "FI" is indicated in the LCD panel. Motorcycle
does not run.
"CHEC": The LCD panel indicates "CHEC" when no communication signal from the ECM is received for 5
seconds.
For Example:
The ignition switch is turned ON, and the engine stop switch is turned OFF. In this case, the speed-
ometer does not receive any signal from the ECM, and the panel indicates "CHEC".
If CHEC is indicated, the LCD does not indicate the trouble code. It is necessary to check the wiring
harness between ECM and speedometer couplers.
The possible cause of this indication is as follows;
Engine stop switch is in OFF position. Side-stand/ignition inter-lock system is not working. Ignition
fuse is burnt.
NOTE:
Until starting the engine, the FI light turns ON.
The FI light is also turned ON when engine temperature is high or oil pressure is low.
LCD (DISPLAY)
INDICATION
Coolant Temp.
Coolant Temp. and
"FI" letters
*1
"FI" letter
*2
FI LIGHT
INDICATION
–––
FI light turns ON.
FI light turns ON
and blinks.
INDICATION MODE
–––
Each 2 sec. Temp.
or "FI" is indicated.
"FI" is indicated
continuously.