Suzuki 2000 Grand Vitara SQ625 Service Manual page 28

6-24 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
SCAN TOOL DATA DEFINITIONS
COOLANT TEMP (ENGINE COOLANT TEMP.,
_C/_F)
It is detected by engine coolant temp. sensor.
INTAKE AIR TEMP (_C/_F)
It is detected by intake air temp. sensor.
DESIRE 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, the number is not valid.
CLOSED THROT POS (CLOSED THROTTLE
POSITION ON/OFF)
This parameter will read ON when the throttle valve
is fully closed, or OFF when the throttle is not fully
closed.
IAC FLOW DUTY (%)
This parameter indicates IAC valve opening rate
which controls bypass air flow.
VEHICLE SPEED (km/h, MPH)
It is computed based on pulse signals from vehicle
speed sensor on transfer or transmission.
SHORT FT B1 (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 B1 (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.
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 SPEED (RPM)
It is computed by reference pulses from the Camshaft
Position 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.
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%.
INJ PULSE WIDTH (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 multi port fuel
injection).
BATTERY VOLTAGE (V)
This parameter indicates battery positive voltage in-
putted from main relay to ECM.
THROTTLE POS (ABSOLUTE THROTTLE
POSITION, %)
When throttle position sensor is fully closed position,
throttle opening is indicated as 0% and 100% for full
open position.
TP SENSOR VOLT (TP SENSOR OUTPUT
VOLTAGE, V)
Throttle Position Sensor reading provides throttle
valve opening information in the form of voltage.
OXYGEN SENSOR B1 S1 (HO2S-1 OUTPUT
VOLTAGE, V)
It indicates output voltage of HO2S-1 installed on ex-
haust manifold (pre-catalyst).
OXYGEN SENSOR B1 S2 (HO2S-2 OUTPUT
VOLTAGE, V)
It indicates output voltage of HO2S-2 installed on ex-
haust pipe (post-catalyst). It is used to detect catalyst
deterioration.
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
conditions (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.