RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0591215 AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model (NR Series) with Manual Air Conditioning System for Electrical Control Type)  B14B8  Refrigerant Shortage  


DESCRIPTION

This DTC is stored if the amount of refrigerant in the air conditioning system is insufficient.

The air conditioning amplifier assembly receives the ambient temperature signal, refrigerant pressure signal, etc. from various sensors.

Based on these signals, the air conditioning amplifier assembly detects the amount of refrigerant.

If the amount of refrigerant is insufficient, the A/C switch indicator will turn off and the air conditioning system will stop operating.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14B8 Refrigerant Shortage The following condition is detected in the normal operation refrigerant shortage check:
Amount of refrigerant is insufficient
·

Refrigerant line

·

Cooler expansion valve

·

Air conditioner pressure sensor

·

Harness or connector

·

Air conditioning amplifier assembly


Memorized
(10 min. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.


WIRING DIAGRAM

E370470E16
2.146,0.396 2.302,0.594 0.156,0.198 10 false 3 2.156,0.865 2.313,1.063 0.156,0.198 10 false 2 2.156,1.344 2.313,1.542 0.156,0.198 10 false 1 1.948,0.396 2.104,0.594 0.156,0.198 10 false + 1.854,0.865 2.125,1.063 0.271,0.198 10 false PR 1.958,1.323 2.115,1.521 0.156,0.198 10 false - 0.375,2.021 0.646,2.219 0.271,0.198 10 false A61 0.365,2.167 2.531,2.385 2.167,0.219 10 false Air Conditioner Pressure Sensor 4.896,2.042 5.167,2.24 0.271,0.198 10 false I48 4.885,2.198 7.156,2.396 2.271,0.198 10 false Air Conditioning Amplifier Assembly 4.823,0.875 4.979,1.073 0.156,0.198 10 false 6 4.75,0.385 4.969,0.583 0.219,0.198 10 false 11 4.76,1.344 4.979,1.542 0.219,0.198 10 false 15 5.01,0.875 5.385,1.063 0.375,0.188 10 false PRE 5.01,0.396 5.385,0.583 0.375,0.188 10 false S5-3 5.01,1.344 5.385,1.531 0.375,0.188 10 false SG-4 5.729,0.313 6.104,0.5 0.375,0.188 10 false 5 V 6.469,0.979 6.844,1.167 0.375,0.188 10 false AD

PROCEDURE

1.CHECK REFRIGERANT PRESSURE
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Air Conditioner / Data List.


e.

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
Regulator Pressure Sensor Air conditioner pressure sensor Min.: -0.4566 MPaG
Max.: 3.2943 MPaG 		Actual refrigerant pressure displayed
·

Refrigerant line (gas leak etc.)

·

Air conditioner pressure sensor circuit malfunction


Body Electrical > Air Conditioner > Data List
Tester Display
Regulator Pressure Sensor
50003 121 51

f.

Install a manifold gauge set.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REFRIGERANT>ON-VEHICLE INSPECTION


g.

Read the manifold gauge set with the following conditions met.

Measurement Condition:
Item Condition
Vehicle doors Fully open
Temperature setting MAX COLD
Blower speed HI
A/C switch On
Recirculation/fresh switch RECIRCULATION
Interior temperature 30 to 35°C (86 to 95°F)


Standard Pressure:
Low pressure side:

150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)

High pressure side:

1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)


h.

Compare the values displayed in the Data List and on the manifold gauge set.

OK:

The values displayed in the Data List and on the manifold gauge set match.



Result:
Proceed to
OK
NG



OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REFRIGERANT>ON-VEHICLE INSPECTION


NG

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.

Disconnect the A61 air conditioner pressure sensor connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A61-3 (+) - Body ground Ignition switch ON 4.75 to 5.25 V



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - BODY GROUND)

NG

7.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - BODY GROUND)
a.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A61-1 (-) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

NG

6.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
4.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Disconnect the I48 air conditioning amplifier assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A61-2 (PR) - I48-6 (PRE) Always Below 1 Ω
A61-2 (PR) or I48-6 (PRE) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

5.INSPECT AIR CONDITIONER PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.INSPECT AIR CONDITIONER PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT)
E389753C03
0.479,0.521 0.969,0.771 0.49,0.25 0.906,1.698 1.5,2.823 true 0.625,0.563 1.083,0.76 0.458,0.198 10 false I48 0.156,0.115 0.615,0.313 0.458,0.198 10 false *a 1.427,2.875 1.885,3.073 0.458,0.198 10 false PRE
*a Component with harness connected
(Air Conditioning Amplifier Assembly)


a.

Measure the voltage with the following conditions met.

Measurement Condition:
Item Condition
Vehicle doors Fully open
Temperature setting MAX COLD
Blower speed HI
A/C switch On
Recirculation/fresh switch RECIRCULATION
Interior temperature 25 to 35°C (77 to 95°F)

NOTICE:
·

If refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the voltage exceeds 4.73 V), a fail-safe function will stop compressor operation. In this case, make sure to measure the voltage before the fail-safe function operates.

·

It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the malfunction may recur after a while.



HINT:

When the ambient air temperature is low(below -1.5°C (29.3°F)), the compressor with pulley will be stopped, due to inputs of the thermistor assembly and No. 1 cooler thermistor, to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.


i.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I48-6 (PRE) - Body ground Ignition switch ON
(A/C switch: On) 		0.62 to 4.73 V*


*: While sensor voltage is 5 V.



b.

Connect the GTS to the DLC3.


c.

Turn the ignition switch to ON.


d.

Turn the GTS on.


e.

Enter the following menus: Body Electrical / Air Conditioner / Data List.


f.

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
Regulator Pressure Sensor Air conditioner pressure sensor Min.: -0.4566 MPaG
Max.: 3.2943 MPaG 		Actual refrigerant pressure displayed
·

Refrigerant line (gas leak etc.)

·

Air conditioner pressure sensor circuit malfunction


Body Electrical > Air Conditioner > Data List
Tester Display
Regulator Pressure Sensor
50003 121 51
OK:

The voltage and value displayed in the Data List change.



Result:
Result Proceed to
OK A
NG (The voltage changes but the value displayed in the Data List does not change.)
NG (The voltage does not change.) B



A

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


B

REPLACE AIR CONDITIONER PRESSURE SENSOR

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PRESSURE SENSOR>REMOVAL


6.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Disconnect the I48 air conditioning amplifier assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A61-1 (-) - I48-15 (SG-4) Always Below 1 Ω
A61-1 (-) or I48-15 (SG-4) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)
a.

Disconnect the I48 air conditioning amplifier assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A61-3 (+) - I48-11 (S5-3) Always Below 1 Ω
A61-3 (+) or I48-11 (S5-3) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR