Toyota Yaris: Air Conditioning System / Ambient Temperature Sensor Circuit Short to Battery or Open (P007015)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / Ambient Temperature Sensor Circuit Short to Battery or Open (P007015)

DESCRIPTION

The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is connected to the combination meter assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The resistance of the thermistor assembly changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The combination meter assembly applies voltage (5 V) to the thermistor assembly and reads voltage changes due to changes in the resistance of the thermistor assembly. The air conditioning amplifier assembly communicates with the combination meter assembly via CAN communication. The combination meter assembly sends ambient temperature signal to the air conditioning amplifier assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
P007015	Ambient Temperature Sensor Circuit Short to Battery or Open	Diagnosis Condition: Ignition switch ON Malfunction Status: Open or short in ambient temperature sensor circuit Detection Time: Continuously for 4 seconds or more	Thermistor assembly Harness or connector Combination meter assembly Air conditioning amplifier assembly	Memorized

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

P007015

Ambient Temperature Sensor Circuit Short to Battery or Open

Diagnosis Condition:

Ignition switch ON

Malfunction Status:

Open or short in ambient temperature sensor circuit

Detection Time:

Continuously for 4 seconds or more

Thermistor assembly
Harness or connector
Combination meter assembly
Air conditioning amplifier assembly

Memorized

DTC Detection Condition Combination Table

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	○	○
Malfunction	Open in ambient temperature sensor circuit	○	-
Malfunction	Short in ambient temperature sensor 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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.
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When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.	READ VALUE USING GTS (AMBIENT TEMPERATURE SENSOR)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ambient Temperature Sensor	Thermistor assembly	Min.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F)	Actual ambient temperature displayed	Thermistor assembly circuit malfunction

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Ambient Temperature Sensor

Thermistor assembly

Min.: -327.68°C (-557.82°F)

Max.: 327.67°C (621.81°F)

Actual ambient temperature displayed

Thermistor assembly circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temperature Sensor

OK:

The display is as specified in the normal condition column.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

2.	INSPECT THERMISTOR ASSEMBLY

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REPLACE THERMISTOR ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (THERMISTOR ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the H6 combination meter assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A52-1 (SO-) - H6-11 (TX1-)	Always	Below 1 Ω
A52-2 (SO+) - H6-16 (TX1+)	Always	Below 1 Ω
A52-1 (SO-) or H6-11 (TX1-) - Other terminals and body ground	Always	10 kΩ or higher
A52-2 (SO+) or H6-16 (TX1+) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE COMBINATION METER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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