0-88
REXTON 2007.09
6810-15
CIRCUIT
3) CIRCUIT DESCRIPTION
(1) PTC (POSITIVE TEMPERATURE COEFFICIENT) SYSTEM
The supplementary electrical heater is installed in DSL engine equipped vehicle as a basic
equipment. The PTC system is operated according to two temperature values measured at
the coolant temperature sensor and HFM sensor. This device is mounted in the heater ai
outlet and increase the temperature of air to the passenger room. Because PTC system is
heated by electrical power, high capacity alternator is required. (Alternator of 12 V 75 A/90
has changed to 12 V 140A)
(2) PTC OPERATING (ON) CONDITION
The operating condition of PTC is controlled by two step. Generally, ECU control the powe
relay for PTC depending on the coolant temperature and ambient temperature sensor.
1st step (Initial PTC operating condition
▶
When coolant temperature < 15°C, PTC is operating (ON).
When coolant temperature ≥ 15°C, tow conditions decribed below must be
satisfied.
-
-
2nd step (Coolant temperature: 15°C)
▶
When coolant temperature 65°C ≤ and ambient temperature ≤ 10°C PTC operates
(ON)
When coolant temperature 65 ~ 60°C and ambient temperature -10°C ~ 0°C PTC
operates
(ON)
When coolant temperature ≤ 60°C and ambient temperature ≤ 0°C ~ 5°C, PTC
operates
(ON)
-
-
-
PTC “OFF” CONDITION
▶
Airconditioner blower switch OFF
Ambient temperature sensor error (wiring short or open)
When engine craking
Battery voltage is lower than 11V
When preheating the engine (Glow indicator “ON”)
-
-
-
-
-
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