HA -50
HEATING, VENTILATION AND AIR CONDITIONING
PTC (POSITIVE TEMPERATURE
COEFFICIENT) HEATER
DESCRIPTION
EC3EA1C9
PTC (Positive Temperature Coefficient) heater (A) is
an electric heater using a PTC element as an auxiliary
heating device that supplements deficiency of interior
heat source in highly effective diesel engine (U engine).
A
SCMHA6152D
An electric heater heats up the interior by directly heating
the air that passes through the heater.
PTC = positive Temperature Coefficient
The name itself implies that the element has a proportional
resistance change sensitive to temperature. PTC heater
is installed at the exit or the backside of heater core.
AQJF301A
OPERATION PRINCIPLE
ECM outputs a PTC on signal. Operate PTC from 1st
setting to 3rd setting with an interval of 15 seconds.
Heat up the air, which passes through a heater core.
GND
2
1
3
Connector
LQJF301C
OPERATION CONDITION
Judge the condition by ambient temperature is below 5 C,
coolant temperature is below 70 C, and battery voltage is
above 11V and engine RPM is above 700RPM.