Inspection Procedure

READ VALUE USING INTELLIGENT TESTER (EVAP FIN TEMP)

(a) Connect the intelligent tester with CAN VIM to the DLC3.

(b) Turn the ignition switch ON and turn the intelligent tester main switch ON.

(c) Select the item below in the DATA LIST, and read the value displayed on the intelligent tester.

DATA LIST / AIR CONDITIONER

Item

Measurement Item / Display (Range)

Normal Condition

Diagnostic Note

EVAP FIN TEMP (Evaporator fin thermistor)

Evaporator fin thermistor /

Min.: -29.7°C (-21.46°F) Max.: 59.55°C (139.019°F)

Actual evaporator temperature is displayed

Open circuit: -29.7°C (-21.46°F) Short circuit: 59.55°C (139.019°F)

The display is as specified in the normal condition column.

Result

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE AIR CONDITIONING AMPLIFIER

INSPECT NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR)

Component Side:

No. 1 Cooler Thermistor
Resistance (kQ)

10 14

10 50

20 68

Temperature

30 86

(a) Remove the evaporator temperature sensor.

(b) Measure the resistance. Standard resistance

Tester Connection

Condition

Specified Condition

1 - 2

-10oC (14oF)

7.30 to 9.10 kQ

1 - 2

-5oC (23oF)

5.65 to 6.95 kQ

1 - 2

OoC (32oF)

4.40 to 5.35 kQ

1 - 2

5oC (41oF)

3.40 to 4.15 kQ

1 - 2

10oC (50oF)

2.70 to 3.25 kQ

1 - 2

15oC (59oF)

2.14 to 2.58 kQ

1 - 2

20oC (68oF)

1.71 to 2.05 kQ

1 - 2

25oC (77oF)

1.38 to 1.64 kQ

1 - 2

30oC (86oF)

1.11 to 1.32 kQ

NOTICE:

• Touching the sensor even slightly may change the resistance value. Be sure to hold the connector of the sensor.

• When measuring, the sensor temperature must be the same as the ambient temperature.

HINT:

As the temperature increases, the resistance decreases (see the graph on the left).

(c) Reinstall the evaporator temperature sensor.

REPLACE NO. 1 COOLER THERMISTOR (EVAPORATOR TEMPERATURE SENSOR)

CHECK HARNESS AND CONNECTOR (No. 1 COOLER THERMISTOR - AIR CONDITIONING AMPLIFIER)

Wire Harness Side:

No. 1 Cooler Thermistor Connector

BPtt

Front View

Air Conditioning Amplifier Connector w/o PTC Heater:

w/ PTC Heater:

SG-2

SG-2

(a) Disconnect the E2 No. 1 cooler thermistor (evaporator temperature sensor) connector.

(b) Disconnect the E8 air conditioning amplifier connector.

(c) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

E2-2 - E8-10 (TE)

Below 1 Q

E2-1 - E8-4 (SG-2)

Below 1 Q

E2-2 - Body ground

10 kQ or higher

E2-1 - Body ground

10 kQ or higher

(d) Reconnect the No. 1 cooler thermistor connector.

(e) Reconnect the air conditioning amplifier connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE AIR CONDITIONING AMPLIFIER

B1423/23

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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