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Suzuki GSX-R 1000 Service Manual: Injection timing description

Injection time (injection volume)

The factors to determine the injection time include the basic fuel injection time, which is calculated on the basis of the intake air pressure, engine speed and throttle opening angle, and various compensations. These compensations are determined according to the signals from various sensors that detect the engine and driving conditions.

Suzuki GSX-R. Injection time


Compensation of injection time (volume)

The following different signals are output from the respective sensors for compensation of the fuel injection time (volume).

Signal

Descriptions

Atmospheric pressure sensor signal When atmospheric pressure is low, the sensor sends the signal to the ecm and reduce the injection time (volume).
Engine coolant temperature sensor signal When engine coolant temperature is low, injection time (volume) is increased.
Intake air temperature sensor signal When intake air temperature is low, injection time (volume) is increased.
Heated oxygen sensor signal Air/fuel ratio is compensated to the theoretical ratio from density of oxygen in exhaust gas. The compensation occurs in such a way that more fuel is supplied if detected air/fuel ratio is lean and less fuel is supplied if it is rich.
Battery voltage signal Ecm operates on the battery voltage and at the same time, it monitors the voltage signal for compensation of the fuel injection time (volume). A longer injection time is needed to adjust injection volume in the case of low voltage.
Engine rpm signal At high speed, the injection time (volume) is increased. This is the compensation of the srad.
Starting signal When starting engine, additional fuel is injected during cranking engine.
Acceleration signal/deceleration signal During acceleration, the fuel injection time (volume) is increased, in accordance with the throttle opening speed and engine rpm.

During deceleration, the fuel injection time (volume) is decreased.

Injection stop control

Signal

Descriptions

Tip-over sensor signal (fuel shut-off) When the motorcycle tips over, the tip-over sensor sends a signal to the ecm. Then, this signal cuts off current supplied to the fuel pump, fuel injectors and ignition coils.
Over-rev. Limiter signal The fuel injectors stop operation when engine rpm reaches rev.

Limit rpm.

The fuel cut-off circuit is incorporated in this ecm in order to prevent over-running of engine. When engine speed reaches 13 500 r/min, this circuit cuts off fuel at the fuel injectors. But under no load, the clutch lever is pulled or the gear position is in neutral, this circuit cuts off fuel when engine speed reaches 13 100 r/min.

Caution


under no load, the engine can run over 13 100 r/min through the fuel cut-off circuit is effective, which may possibly cause engine damage. Do not run the engine without load over 13 100 r/min at anytime.

General description
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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 indicator ...

Other materials:

Precautions
Precautions for driveline / axle Refer to general precautions in section 00 (page 00-1). Never inspect or adjust the drive chain while the engine is running.   Caution  do not use trichloroethylene, gasoline or such similar solvent. These fluids will d ...

Isc valve preset and opening initialization
When removing or replacing the isc valve, set the isc valve to the following procedures:  turn the ignition switch on.  Set up the sds tool. (Refer to the sds operation manual for further details.)  Click the active control.  Click the isc learned value reset (1) ...

Precautions
Precautions for brake system Refer to general precautions in section 00 (page 00-1). Brake fluid information This brake system is filled with an ethylene glycol-based dot 4 brake fluid. Do not use or mix different types of fluid, such as silicone-based or petroleum-based. ...

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