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6-10 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M15 ENGINE)
SCAN TOOL DATA
BLOWER FAN
A/C SWITCH
(if equipped with A/C)
A/C MAG CLUTCH
(if equipped with A/C)
A/C COND FAN
(if equipped with A/C)
VVT GAP (TARGET-
ACTUAL POSITION)
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.
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 multiport fuel injection).
TP SENSOR VOLT (THROTTLE POSITION SENSOR OUTPUT VOLTAGE, V)
The Throttle Position Sensor reading provides throttle valve opening information in the form of voltage.
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.
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).
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 indi-
cates no correction, a value greater than 0 means an enrichment correction, and a value less than 0 implies an
enleanment correction.
VEHICLE CONDITION
Ignition switch ON Blower fan switch: 2nd
speed position or more
Blower fan switch: under
2nd speed position
Engine running after warming up, A/C not oper-
ating
Engine running after warming up, A/C operat-
ing
Engine running
A/C switch and blower
motor switch turned ON
A/C switch and blower
motor switch turned OFF
Engine running
Blower motor switch and
A/C switch turned ON
Blower motor switch and/
or A/C switch turned OFF
At specified idle speed after warming up
NORMAL CONDITION/
REFERENCE VALUES
ON
OFF
OFF
ON
ON
OFF
ON
OFF
0 – 3°
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