RM35X0E _58 Vehicle Interior _079316 HEATING / AIR CONDITIONING _0386652 AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Manual Air Conditioning System)  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.

The A/C switch indicator is turned off and the air conditioning system is stopped if the amount of refrigerant is insufficient.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14B8 Refrigerant Shortage
·

Diagnosis condition: The amount of refrigerant is judged to be insufficient in normal operation

·

Malfunction status: When following condition is detected in refrigerant shortage check in normal operation; Amount of refrigerant is insufficient

·

Detection time: During air conditioning system operation for 10 minutes or more


·

Refrigerant pipe line (leaks, stuck)

·

Cooler expansion valve

·

Air conditioning amplifier assembly

·

Lack of refrigerant gas


Memorized

WIRING DIAGRAM

E316642
4.479,2.875 4.938,3.073 0.458,0.198 10 false N41 4.479,3.031 6.927,3.365 2.448,0.333 10 false Air Conditioning Amplifier Assembly 4.563,1.094 5.01,1.281 0.448,0.188 10 false S5-3 4.573,1.573 5.021,1.76 0.448,0.188 10 false PRE 4.563,2.031 5.01,2.219 0.448,0.188 10 false SG-4 4.229,1.094 4.677,1.281 0.448,0.188 10 false 11 4.292,1.573 4.74,1.76 0.448,0.188 10 false 6 4.24,2.042 4.688,2.229 0.448,0.188 10 false 15 1.99,1.083 2.438,1.271 0.448,0.188 10 false 3 2,1.573 2.448,1.76 0.448,0.188 10 false 2 2,2.042 2.448,2.229 0.448,0.188 10 false 1 1.656,1.563 2.104,1.75 0.448,0.188 10 false PR 1.74,1.083 2.188,1.271 0.448,0.188 10 false + 1.75,2.042 2.198,2.229 0.448,0.188 10 false - 0.375,2.563 0.833,2.76 0.458,0.198 10 false A37 0.375,2.708 2.823,3.042 2.448,0.333 10 false Air Conditioner Pressure Sensor 5.531,0.938 5.979,1.125 0.448,0.188 10 false 5 V 5.99,1.688 6.438,1.875 0.448,0.188 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 (gauge)
Max.: 3.2943 MPaG (gauge) 		Actual refrigerant pressure displayed
·

Refrigerant line (gas leak etc.)

·

Air conditioner pressure sensor system 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 pressure when the following conditions are met.

i.

Prepare the vehicle according to the table below.

Measurement Condition:
Item Condition
Vehicle Condition Engine running
Doors Fully closed (windows also fully closed)
A/C Switch On
Recirculation/fresh Control Switch Recirculation
Set Temperature MAX COLD
Blower Speed HI
Air Conditioning Air Inlet Temperature 25 to 35°C (77 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.

OK:

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



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - POWER SOURCE)

NG

GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE)

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Manual Air Conditioning System)>ON-VEHICLE INSPECTION


2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - POWER SOURCE)
a.
E349835C81
1.49,0.26 1.99,0.51 0.5,0.25 2.385,1.583 2.125,1.583 2.125,1.583 1.885,1.177 true 1.615,0.302 2.073,0.5 0.458,0.198 10 false A37 2.458,1.51 2.917,1.708 0.458,0.198 10 false + 0.052,0.052 0.51,0.25 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


Disconnect the air conditioner pressure sensor connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A37-3 (+) - 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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - BODY GROUND)
a.
E349835C82
1.49,0.26 1.99,0.51 0.5,0.25 0.906,0.75 1.177,0.75 1.177,0.75 1.49,1.083 true 1.615,0.302 2.073,0.5 0.458,0.198 10 false A37 0.771,0.656 1.229,0.854 0.458,0.198 10 false - 0.052,0.052 0.51,0.25 0.458,0.198 10 false *a
*a Front view of wire harness connector
(to Air Conditioner Pressure Sensor)


Disconnect the air conditioner pressure sensor connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A37-1 (-) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

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

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 air conditioner pressure sensor connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N41-6 (PRE) - A37-2 (PR) Always Below 1 Ω
N41-6 (PRE) or A37-2 (PR) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

5.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY (SENSOR SIGNAL CIRCUIT)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY (SENSOR SIGNAL CIRCUIT)
a.

Measure the voltage when the following conditions are met.

Measurement Condition:
Item Condition
Vehicle Condition Engine running
Doors Fully closed (windows also fully closed)
A/C Switch On
Recirculation/fresh Control Switch Recirculation
Set Temperature MAX COLD
Blower Speed HI
Air Conditioning Air Inlet 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 4.61 V), the fail-safe function stops compressor operation. Therefore, measure the voltage before the fail-safe operation.

·

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 outside air temperature is low (below -1.5°C (29.3°F)), the compressor stops due to operation of the thermistor assembly and the No. 1 cooler thermistor to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.


i.
E407115
0.063,0.375 0.563,0.625 0.5,0.25 2.021,1.01 2.406,1.833 2.406,1.833 2.74,1.833 true 2.823,1.729 3.281,1.927 0.458,0.198 10 false PRE 0.188,0.417 0.646,0.615 0.458,0.198 10 false N41 0.063,0.063 0.521,0.26 0.458,0.198 10 false *a
*a Component with harness connected
(Air Conditioning Amplifier Assembly)


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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
N41-6 (PRE) - Body ground
·

Engine running

·

Air conditioning system operating


0.74 to 4.61 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 (gauge)
Max.: 3.2943 MPaG (gauge) 		Actual refrigerant pressure displayed
·

Refrigerant line (gas leak etc.)

·

Air conditioner pressure sensor system 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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
a.

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 air conditioner pressure sensor connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N41-15 (SG-4) - A37-1 (-) Always Below 1 Ω
N41-15 (SG-4) or A37-1 (-) - 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 CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR)
a.

Disconnect the N41 air conditioning amplifier assembly connector.


b.

Disconnect the A37 air conditioner pressure sensor connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N41-11 (S5-3) - A37-3 (+) Always Below 1 Ω
N41-11 (S5-3) - A37-3 (+) - 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