DTC P1F1C-15: Water Cooling Condenser Refrigerant Temperature Sensor Circuit Short to Battery or Open [08/2023 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.

The water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly) is installed on the No. 1 cooler refrigerant discharge hose to detect the refrigerant gas temperature from the heater and accessory assembly and is used to control the air conditioning system. The resistance of the water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly) changes in accordance with the refrigerant gas temperature from the heater and accessory assembly. Resistance increases as the refrigerant gas temperature drops and decreases as the temperature rises. The heat pump ECU assembly outputs a voltage to the water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly) and reads voltage changes that result from the changes in the resistance of the water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	DTC Output from	Priority	Note
P1F1C-15	Water Cooling Condenser Refrigerant Temperature Sensor Circuit Short to Battery or Open	Diagnosis Condition: Ignition switch ON Malfunction Status: Open or short in water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly) circuit Detection Time: Continuously for 4 seconds or more	Water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly) Harness or connector Air conditioning amplifier assembly Heat pump ECU assembly	Does not come on	Memorized	Air Conditioner	A	-

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

DTC Output from

Priority

Note

P1F1C-15

Water Cooling Condenser Refrigerant Temperature Sensor Circuit Short to Battery or Open

Diagnosis Condition:

Ignition switch ON

Malfunction Status:

Open or short in water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly) circuit

Detection Time:

Continuously for 4 seconds or more

Water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly)
Harness or connector
Air conditioning amplifier assembly
Heat pump ECU assembly

Does not come on

Memorized

Air Conditioner

DTC DETECTION CONDITION COMBINATION TABLE

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	◦	◦
Malfunction	Open in water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly) circuit	◦	-
Malfunction	Short in water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly) circuit	-	◦
Detection Time		Continuously for 4 seconds or more	Continuously for 4 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored