Suzuki Liana RH418, Supplementary Service Manual

Page: 34 / 371

1A-21 Engine General Information and Diagnosis:
Scan Tool Data Definitions
FUEL SYSTEM (FUEL SYSTEM STATUS)
Air / fuel ratio feedback loop status displayed as either
open or closed loop.
Open indicates that ECM ignores feedback from the
exhaust oxygen sensor.
Closed indicates final injection duration is corrected for
oxygen sensor feedback.
CALC LOAD (CALCULATED LOAD VALUE, %)
Engine load displayed as a percentage of maximum
possible load. Value is calculated mathematically using
the formula: actual (current) intake air volume
÷
maximum possible intake air volume
×
100%
COOLANT TEMP. (ENGINE COOLANT
TEMPERATURE,
°
C,
°
F)
It is detected by engine coolant temp. sensor.
SHORT FT B1 (SHORT TERM FUEL TRIM, %)
Short term fuel trim value represents short term
corrections to the air / fuel mixture computation. A value
of 0 indicates no correction, a value greater than 0
means an enrichment correction, and a value less than 0
implies an enleanment correction.
LONG FT B1 (LONG TERM FUEL TRIM, %)
Long term fuel trim value represents long term
corrections to the air / fuel mixture computation. A value
of 0 indicates no correction, a value greater than 0
means an enrichment correction, and a value less than 0
implies an enleanment correction.
MAP (INTAKE MANIFOLD ABSOLUTE PRESSURE,
kPa, inHg)
It is detected by manifold absolute pressure sensor and
used (among other things) to compute engine load.
ENGINE SPEED (rpm)
It is computed by reference pulses from the crankshaft
position sensor.
VEHICLE SPEED (km/h, MPH)
It is computed based on pulse signals from vehicle
speed sensor.
IGNITION ADVANCE (IGNITION TIMING ADVANCE
FOR NO.1 CYLINDER,
°
)
Ignition timing of No.1 cylinder is commanded by ECM.
The actual ignition timing should be checked by using
the timing light.
INTAKE AIR TEMP. (
°
C,
°
F)
It is detected by intake air temp. sensor and used to
determine the amount of air passing into the intake
manifold as air density varies with temperature.
MAF (MASS AIR FLOW RATE, g/s, lb/min.)
It represents total mass of air entering intake manifold
which is computed base on signals from MAP sensor,
IAT sensor, TP sensor, etc.
THROTTLE POSITION (ABSOLUTE THROTTLE
POSITION, %)
When throttle position sensor is fully closed position,
throttle opening is indicated as 0% and 100% full open
position.
OXYGEN SENSOR B1 S1 (HEATED OXYGEN
SENSOR-1, V)
It indicates output voltage of HO2S-1 installed on
exhaust manifold (pre-catalyst).
DESIRED IDLE (DESIRED IDLE SPEED, rpm)
The Desired Idle Speed is an ECM internal parameter
which indicates the ECM requested idle. If the engine is
not running, this number is not valid.
)
A/C COND FAN (if equipped
with A/C) Engine running
Blower motor switch and A/C
switch turned ON / ECT over
110
°
C, 230
°
F
ON
Blower motor switch and/or A/C
switch turned OFF
OFF
)
A/C PRESSURE SW (if
equipped with A/C) Ignition switch turned ON ON
)
BLOWER FAN
Ignition switch ON
Blower fan switch: 3rd speed
position or more
ON
Blower fan switch: under 3rd
speed position
OFF
)
A/C MAG CLUTCH (if
equipped with A/C) Engine running
A/C switch and blower motor
switch turned ON
ON
A/C switch and blower motor
switch turned OFF
OFF
Scan tool data Vehicle condition
Normal condition /
reference values