Suzuki SY413 Service Manual page 2746

SCAN TOOL DATA DEFINITIONS
FUEL SYSTEM (FUEL SYSTEM STATUS)
Air/fuel ratio feedback loop status displayed as one of
the followings.
OPEN: Open loop-has not yet satisfied conditions to
go closed loop.
CLOSED: Closed loop-using oxygen sensor(s) as
feedback for fuel control.
OPEN-DRIVE COND: Open loop due to driving condi-
tions (Power enrichment, etc.).
OPEN SYS FAULT: Open loop due to detected system
fault.
CLOSED-ONE O2S: Closed loop, but fault with at
least one oxygen sensor-may be using single oxygen
sensor for fuel control.
CALC LOAD (CALCULATED LOAD VALUE, %)
Engine load displayed as a percentage of maximum
possible load. Value is calculated mathematically us-
ing the formula: actual (current) intake air volume B
maximum possible intake air volume x 100%.
COOLANT TEMP.
(ENGINE COOLANT TEMPERATURE, _C, _F)
It is detected by engine coolant temp. sensor.
SHORT FT (SHORT TERM FUEL TRIM, %)
Short term fuel trim value represents short term
corrections to the air/fuel mixture computation. A val-
ue 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 (LONG TERM FUEL TRIM, %)
Long term fuel trim Value represents long term correc-
tions 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 im-
plies an enleanment correction.
ENGINE SPEED (rpm)
It is computed by reference pulses from the camshaft
position sensor.
VEHICLE SPEED (km/h, MPH)
It is computed based on pulse signals from speedom-
eter and vehicle speed sensor on transmission.
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.
ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC) 6-2-29
INTAKE AIR TEMP. (_C, _F)
It is detected by intake air temp. sensor.
MAF (MASS AIR FLOW RATE, g/s, lb/min.)
It represents total mass of air entering intake manifold
which is measured by mass air flow sensor.
THROTTLE POS
(ABSOLUTE THROTTLE POSITION, %)
When throttle position sensor is fully closed position,
throttle opening is indicated as 0% and 90 – 100% full
open position.
O2S S1 (HEATED OXYGEN SENSOR-1, V)
It indicates output voltage of HO2S-1 installed on ex-
haust manifold (pre-catalyst).
O2S S2 (HEATED OXYGEN SENSOR-2, V)
It indicates output voltage of HO2S-2 installed on ex-
haust pipe (post-catalyst). It is used to detect catalyst
deterioration.
MAP (INTAKE MANIFOLD ABSOLUTE
PRESSURE, kPa, inHg)
It is detected by manifold absolute pressure sensor and
used (among other things) to compute engine load.
BAROMETRIC PRES (BAROMETRIC PRESSURE,
kPa, inHg)
This parameter represents a measurement of baro-
metric air pressure and is used for altitude correction
of the fuel injection quality and IAC valve control.
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.
TP SENSOR VOLT (THROTTLE POSITION
SENSOR OUTPUT VOLTAGE, V)
The Throttle Position Sensor reading provides throttle
valve opening information in the form of voltage.
INJ PULSE WID
(FUEL INJECTION PULSE WIDTH, msec.)
This parameter indicates time of the injector drive
(valve opening) pulse which is output from ECM (but
injector drive time of No.1 cylinder for multiport fuel in-
jection).
IAC FLOW DUTY
(IDLE AIR (SPEED) CONTROL DUTY, %)
This parameter indicates current flow time rate within
a certain set cycle of IAC valve (valve opening rate)
which controls the amount of bypass air (idle speed).