2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 66Get this manual
Engine General Information and Diagnosis: Compensation of injection time (Volume) The following different signals are output from the respective sensors for compensation of the fuel injection time (volume)Signal ENGINE COOLANT TEMPERATURE SENSOR SIGNAL INTAKE AIR TEMPERATURE SENSOR SIGNAL BATTERY VOLTAGE SIGNAL ACCELERATION SIGNAL DECELERATION SIGNAL Injection stop control
Descriptions When engine coolant temperature is low, injection time (volume) is increasedWhen intake air temperature is low, injection time (volume) is increasedECM 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 voltageDuring acceleration, the fuel injection time (volume) is increased in accordance with the throttle opening speed and engine rpmDuring deceleration, the fuel injection time (volume) is decreased
Descriptions When the vehicle tips over, the tip-over sensor sends signal to TIP-OVER SENSOR SIGNAL (FUEL SHUT-OFF) the ECMThen, this signal cuts OFF current supplied to the fuel pump, fuel injector and ignition coilThe fuel injector stops operation when engine rpm reaches revlimit rpmNOTE OVER-REVLIMITER SIGNAL The fuel cut-off circuit is incorporated in this ECM in order to prevent over-running of engineWhen engine speed reaches 300 rmin, this circuit cuts off fuel at the fuel injector