Inspection Procedure

CHECK REFRIGERANT

c

>

öölgf—

Sight Glass

v

>

(a) Check the sight glass of the cooler unit refrigerant liquid pipe.

(1) Prepare the vehicle in accordance with the chart below.

Item

Condition

Vehicle Doors

Fully open

Temperature Setting

MAX COLD

Blower Speed

HI

A/C Switch

ON

(2) Compare the sight glass to the following chart.

Item

Symptom

Amount of Refrigerant

Corrective Procedures

1

Bubbles visible

Insufficient*

(1) Check for gas leakage and repair if necessary

(2) Add refrigerant until bubbles disappear

2

No bubbles visible

Empty, insufficient or too much

Refer to items 3 and 4

3

No temperature difference between compressor inlet and outlet

Empty or nearly empty

(1) Check for gas leakage with gas leak detector and repair if necessary

(2) Add refrigerant until bubbles disappear

4

Considerable temperature difference between compressor inlet and outlet

Correct or too much

Refer to items 5 and 6

5

Immediately after A/C turned OFF, refrigerant becomes clear

Too much

(1) Drain or discharge refrigerant

(2) Bleed air and supply proper amount of purified refrigerant

6

Immediately after A/C turned OFF, refrigerant foams and then becomes clear

Correct

*: If the ambient temperature is higher than usual but cooling is sufficient, bubbles in the sight glass are permissible.

CHARGE REFRIGERANT

READ VALUE OF INTELLIGENT TESTER (REG PRESS SENS)

(a) Connect the intelligent tester 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

Measure Item / Display (Range)

Normal Condition

Diagnostic Note

REG PRESS SENS (Regulator pressure sensor)

Regulator Pressure Sensor / Min.: 0 kgf / cm 2G, Max.: 38.25 kgf / cm 2G

Actual regulator pressure is displayed

-

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

CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER)

Wire Harness Side:

Air Conditioning Pressure Sensor Connector

Front View

Front View

Air Conditioning Amplifier Connector w/o PTC Heater:

PRE w/ PTC Heater:

SG-1

S5-3

SG-1

(a) Disconnect the A3 air conditioning pressure sensor connector.

(b) Disconnect the E8 air conditioning amplifier connector.

(c) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

A3-1 (-) - E8-11 (SG-1)

Below 1 Q

A3-2 (PR) - E8-6 (PRE)

Below 1 Q

A3-3 (+) - E8-1 (S5-3)

Below 1 Q

A3-1 (-) - Body ground

10 kQ or higher

A3-2 (PR) - Body ground

10 kQ or higher

A3-3 (+) - Body ground

10 kQ or higher

(d) Reconnect the air conditioning pressure sensor connector.

(e) Reconnect the air conditioning amplifier connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT AIR CONDITIONING AMPLIFIER

Wire Harness Side:

Air Conditioning Amplifier Connector w/o PTC Heater:

GND w/ PTC Heater:

SG-1

(a) Remove the air conditioning amplifier with its connectors still connected.

(b) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

E8-11 (SG-1) - E8-12 (GND)

Below 1 Q

(c) Turn the ignition switch ON.

(d) Measure the voltage. Standard voltage

Tester Connection

Specified Condition

E8-1 (S5-3) - E8-11 (SG-1)

4.5 to 5.5 V

(e) Reinstall the air conditioning amplifier.

REPLACE AIR CONDITIONING AMPLIFIER

INSPECT AIR CONDITIONING PRESSURE SENSOR

Air Conditioning Amplifier w/o PTC Heater:

Air Conditioning Amplifier w/o PTC Heater:

w/ PTC Heater:

SG-1

SG-1

Voltage (V)

(a) Remove the air conditioning amplifier with its connectors still connected.

(b) Set the manifold gauge.

(e) Measure the voltage. Standard voltage

Tester Connection

Refrigerant Pressure

Specified Condition

E8-6 (PRE) - E8-11 (SG-1)

0.196 to 3.14 MPa (2.0 to 32 kgf/cm2)

0.76 to 4.74 V

(f) Reinstall the air conditioning amplifier.

REPLACE LIQUID TUBE SUB-ASSEMBLY A (AIR CONDITIONING PRESSURE SENSOR)

REPLACE AIR CONDITIONING AMPLIFIER

B1451/51

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