Scan Tool Testing and Procedures

Scan Tool Data


HVAC Control Module


As the data values given below are standard values estimated on the basis of values obtained from the normally operating vehicles by using a scan tool, use them as reference values. Even when the vehicles are in good condition, there may be cases where the checked values do not fall within each specifies data range. Therefore, judgement as abnormal should not be made by checking with these data alone.
A/C System Performance Inspection









Scan Tool Data Definitions

TEMP CONT SWITCH: (Temperature control selector position, MAX cool, °C / °F, Max hot)
This parameter indicates the selected position of temperature control selector.
MODE CONT SWITCH (Air flow selector position, AUTO, FACE, B/L, FOOT, DE - FO, DEF)
This parameter indicates the selected position of air flow selector.
FAN CONT SWITCH (Blower speed selector, AUTO, OFF, 1st - 8th)
This parameter indicates the selected position of blower speed selector.
AIR INTAKE MODE (Air intake selector position, AUTO, FRE, REC)
This parameter indicates the selected position of air intake selector.
VEHICLE SPEED (km/h, mph)
This parameter indicates the vehicle speed calculated by ECM.
ECT (Engine Coolant Temperature °C, °F)
This parameter indicates the engine coolant temperature detected by engine coolant temperature sensor.
ENGINE TYPE (Engine type signal, J24B)
This parameter indicates the engine type signal transmitted by ECM.
OUTSIDE AIR TEMP (Outside air temperature, °C, °F)
This parameter indicates the outside air temperature detected by outside air temperature sensor.
CABIN TEMPERATURE: (In-car temperature, °C, °F)
This parameter indicates the in-car temperature detected by inside air temperature sensor.
SUN LOAD (W/m2)
This parameter indicates the amount of sunlight detected by sunload sensor.
EVAPORATOR TEMP (Evaporator temperature, °C °F)
This parameter indicates the temperature of air passed through evaporator.
REFRIGERANT PRESSURE (A/C refrigerant absolute pressure, kPa)
This parameter indicates the A/C refrigerant absolute pressure calculated by ECM.
AIR MIX POS SENSOR (Temperature control actuator position sensor, V)
This parameter indicates the input signal from position sensor in temperature control actuator.
MODE POS SENSOR (Air flow control actuator position sensor, V)
This parameter indicates the input signal from position sensor in air flow control actuator.
R/F POS SENSOR (AIR INTAKE CONTROL ACTUATOR POSITION SENSOR)
This parameter indicates the input signal from position sensor in air intake control actuator.
FAN DESIRED VOLT (Fan desired voltage, V)
This parameter indicates the consumption voltage of blower motor.
A/C CONT SIG (A/C control signal, ON, OFF)
This parameter indicates the state of A/C indicator.
REAR DEF INDICATOR (Rear DEF indicator, ON, OFF)
This parameter indicates the selected position of rear defogger switch.
A/C COMP CLUTCH (A/C compressor magnet clutch, ON, OFF)
This parameter indicates the state of the A/C compressor magnet clutch.