4-10 FI SYSTEM DIAGNOSIS
FI SYSTEM TECHNICAL FEATURES
INJECTION TIME (INJECTION VOLUME)
The factors to determine the injection time include the basic fuel injection time, which is calculated on the basis of 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.
ECM
Intake Air Pressure
Sensor (IAP Sensor)
Crankshaft Position
Sensor (CKP Sensor)
Throttle Position
Sensor (TP Sensor)
Various
Sensors
Injectors
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Intake air pressure |
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signal |
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Basic |
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Engine speed |
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fuel |
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signal |
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injection |
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Throttle opening |
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time |
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signal |
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Various signals |
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Compensation |
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L |
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P |
Ultimate |
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M |
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fuel |
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Injection signal |
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A |
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injection |
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time |
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FI SYSTEM DIAGNOSIS 4-11
COMPENSATION OF INJECTION TIME (VOLUME)
The following different signals are output from the respective sensors for compensation of the fuel injection time (volume).
SIGNAL |
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DESCRIPTION |
ATMOSPHERIC PRESSURE SENSOR |
When atmospheric pressure is low, the sensor sends the |
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SIGNAL |
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signal to the ECM and reduce the injection time (volume). |
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ENGINE COOLANT TEMPERATURE SEN- |
When engine coolant temperature is low, injection time (vol- |
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SOR SIGNAL |
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ume) is increased. |
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INTAKE AIR TEMPERATURE SENSOR |
When intake air temperature is low, injection time (volume) |
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SIGNAL |
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is increased. |
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HEATED OXYGEN SENSOR SIGNAL |
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Air/fuel ratio is compensated to the theoretical ratio from |
(For E-02, 19) |
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density of oxygen in exhaust gasses. The compensation |
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occurs in such a way that more fuel is supplied if detected |
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air/fuel ratio is lean and less fuel is supplied if it is rich. |
BATTERY VOLTAGE SIGNAL |
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ECM operates on the battery voltage and at the same time, |
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it monitors the voltage signal for compensation of the fuel |
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injection time (volume). A longer injection time is needed to |
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E |
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adjust injection volume in the case of low voltage. |
ENGINE RPM SIGNAL |
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At high speed, the injection time (volume) is increased. This |
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L |
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is the compensation of the SRAD. |
STARTING SIGNAL |
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P |
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When starting engine, additional fuel is injected during |
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cranking engine. |
ACCELERATION SIGNAL/ |
M |
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During acceleration, the fuel injection time (volume) is |
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DECELERATION SIGNAL |
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increased in accordance with the throttle opening speed and |
A |
engine rpm. During deceleration, the fuel injection time (vol- |
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ume) is decreased. |
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S |
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INJECTION STOP CONTROL |
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SIGNAL |
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DESCRIPTION |
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TIP-OVER SENSOR SIGNAL |
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When the motorcycle tips over, the tip-over sensor sends a |
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signal to the ECM. Then, this signal cuts OFF current sup- |
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plied to the fuel pump, fuel injectors and ignition coils. |
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OVER-REV. LIMITER SIGNAL |
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The fuel injectors stop operation when engine rpm reaches |
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rev. limit rpm. |
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4-12 FI SYSTEM DIAGNOSIS
FI SYSTEM PARTS LOCATION
ECM
E
L
P
M
A
S
A Throttle position sensor (TPS)
C Secondary throttle valve actuator (STVA) E Exhaust control valve actuator (EXCVA) G Crankshaft position sensor (CKPS)
I Fuel pump (FP)
B Secondary throttle position sensor (STPS) D Intake air pressure sensor (IAPS)
F HO2 sensor (For E-02, 19) H Fuel pump relay (FP relay)
FI SYSTEM DIAGNOSIS 4-13
ECM
E
L
P
M
A
S
J Cooling fan relay
L Intake air temperature sensor (IATS) N Camshaft position sensor (CMPS) P Secondary fuel injector
R Engine coolant temperature sensor (ECTS) T Atmospheric pressure sensor (APS)
V Speedometer
K Cooling fan
M PAIR control solenoid valve O Ignition coil (IG COIL)
Q Primary fuel injector S Speed sensor
U Tip-over sensor (TOS)
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FI |
14-4 |
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Cooling fan motor |
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WIRING SYSTEM |
DIAGNOSIS SYSTEM FI |
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Crankshaft position sensor (CKPS) |
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Speedometer |
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Cooling fan relay |
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15 A |
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B/G |
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G/W |
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O/R |
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O/BI |
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R/BI |
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B/Y |
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Gr/W |
#1 |
Primary |
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Camshaft position |
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Gr/B |
#2 |
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Gr/Y |
#3 |
fuel injector |
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sensor (CMPS) |
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Gr/R |
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#4 |
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Fuel pump |
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Throttle position |
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Lg |
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#1 |
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P/B |
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sensor (TPS) |
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Lg/W |
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#2 |
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R |
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Secondary |
#3 |
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Engine stop switch |
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Lg/G |
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Fuel pump |
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Lg/BI |
fuel injector |
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#4 |
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Y/W |
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relay |
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S |
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10 A |
DIAGRAM |
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Y/R |
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Secondary |
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Y/B |
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Ignition switch |
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throttle position |
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O/Y |
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sensor (STPS) |
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O/G (E-02, 19, 24) O/W (E-03, 28, 33) |
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*2 |
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10 A |
30 A |
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A |
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G/B |
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W/BI |
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#1 |
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Intake air |
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Ignition coil (IG COIL) |
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pressure sensor |
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B |
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#2 |
Side-stand |
15 A |
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(IAPS) |
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relay |
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Y |
M#3 |
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G/Y |
ECM |
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Atmospheric |
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G |
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#4 |
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Neutral indicator |
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pressure sensor |
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P |
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light |
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(APS) |
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N |
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B/BI |
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W/G |
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6 |
1 |
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Engine coolant temperature |
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5 |
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sensor (ECTS) |
Dg |
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PAIR control |
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L |
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Side-stand switch |
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solenoid valve |
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3 2 |
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Intake air temperature sensor |
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Gear position switch 4 |
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P |
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E |
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(IATS) |
B |
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Y/G |
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B/Y |
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Tip-over |
B/Br |
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B/W |
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Starter relay |
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Starter switch |
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sensor (TOS) |
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B/W |
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Y |
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B/W |
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B/R |
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P/W |
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Clutch lever position |
Starter motor |
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R/B |
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B/Lg |
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switch |
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O/W |
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W/B |
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*1 For E-02, 19 markets are equipped |
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EXCVA |
W/B |
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G |
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Secondary throttle |
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HO2 sensor. |
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W/G |
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*1 HO2 sensor |
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*2 For E-02, 19, 24 markets are equipped |
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valve actuator (STVA) |
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immobilizer system. |
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