Engine General Information and Diagnosis: 1A-40
Scan Tool Data Definitions
COOLANT TEMP (ENGINE COOLANT
TEMPERATURE,
°
C,
°
F)
It is detected by engine coolant temp. sensor.
INTAKE AIR TEMP. (
°
C,
°
F)
It is detected by intake air temp. sensor.
ENGINE SPEED (rpm)
It is computed by reference pulses from the camshaft
position sensor.
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.
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 using
the formula: actual (current) intake air volume
÷
maximum possible intake air volume
×
100%
MAP (MANIFOLD ABSOLUTE PRESSURE, in.Hg,
kPa)
This value indicates how much correction is necessary
to keep the air/fuel mixture stoichiometrical.
It is detected by manifold absolute pressure sensor.
THROTTLE POS (ABSOLUTE THROTTLE POSITION,
%)
When throttle position sensor is at fully closed position,
throttle opening is indicated as 0 – 5% and 90 – 100%
full open position.
BAROMETRIC PRESS (kPa, in.Hg)
This parameter represents a measurement of barometric
air pressure and is used for altitude correction of the fuel
injection quantity.
FUEL TANK LEVEL (%):
This parameter indicates approximate fuel level in fuel
tank. As detectable range of fuel level sensor is set as 0
to 100%, however, with some models whose fuel tank
capacity is smaller, indicated fuel level may be only 70%
even when fuel tank is full.
BATTERY VOLTAGE (V)
This parameter indicates battery positive voltage
inputted from main relay to ECM.
BATTERY CURRENT (for J20 engine, A):
This parameter indicates electric load value (consumed
current) detected by electric load current sensor.
)
APP SENSOR 2 VOLT
(ACCELERATOR PEDAL
POSITION (APP) SENSOR
(SUB) OUTPUT VOLTAGE)
Ignition switch ON
after warmed up
engine
Accelerator pedal released
0.3 – 0.4 V
Accelerator pedal depressed
fully
1.7 – 2.2 V
)
ACCEL POSITION
(ABSOLUTE
ACCELERATOR PEDAL
POSITION)
Ignition switch ON
after warmed up
engine
Accelerator pedal released
0 – 5%
Accelerator pedal depressed
fully
90 – 100%
)
TARGET THROTTLE
POSI (TARGET THROTTLE
VALVE POSITION)
Ignition switch ON
after warmed up
engine
Accelerator pedal released
0 – 5%
Accelerator pedal depressed
fully
90 – 100%
)
IAC THROTTLE
OPENING (IDLE AIR
CONTROL THROTTLE
VALVE OPENING)
It idling with no load after warming up
5 – 55%
)
THROTTLE MOTOR
VOLT
Ignition switch ON / engine at stop
10.0 – 14.0 V
)
CLOSED THROTTLE
POS (CLOSED THROTTLE
POSITION)
Throttle valve at idle position
ON
Throttle valve opens larger than idle position
OFF
)
THROTTLE MOTOR
RELAY
At specified idle speed after warming up
ON
*
)
VEHICLE SPEED
At stop
0 km/h (0 mph)
)
INJ PULSE WIDTH (FUEL
INJECTION PULSE WIDTH)
At specified idle speed with no load after warming
up
2.0 – 4.0 msec.
At 2500 r/min. with no load after warming up
2.0 – 3.6 msec.
Scan tool data
Vehicle condition
Normal condition /
reference values
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