DESCRIPTION
This DTC is stored if refrigerant pressure on the high pressure side is extremely low (195 kPa (2.0 kgf/cm2, 28 psi) or less) or extremely high (2812 kPa (28.7 kgf/cm2, 408 psi) or more). The air conditioner pressure (2 words) sensor, which is installed to the high pressure side pipe to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier assembly. The air conditioning conditioner pressure (2 words) converts this signal to a pressure value according to the sensor characteristics and uses it to control the compressor.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
---|---|---|---|---|
B1423 |
Pressure Sensor Circuit |
|
|
- |
Vehicle Condition |
|||||
---|---|---|---|---|---|
Pattern 1 |
Pattern 2 |
Pattern 3 |
Pattern 4 |
||
Diagnosis Condition |
Ignition switch ON |
○ |
○ |
○ |
○ |
Malfunction Status |
Open in air conditioner pressure sensor circuit |
○ |
- |
- |
- |
Short in air conditioner pressure sensor circuit |
- |
○ |
- |
- |
|
Refrigerant pressure on high pressure side is extremely low (195 kPa (2.0 kgf/cm2, 28 psi) or less) |
- |
- |
○ |
- |
|
Refrigerant pressure on high pressure side is extremely high (2812 kPa (28.7 kgf/cm2, 408 psi) or more) |
- |
- |
- |
○ |
|
Detection Time |
4 seconds or more |
4 seconds or more |
4 seconds or more |
4 seconds or more |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
1 trip |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
If DTC B1423/23 and B14B8 are output at the same time, troubleshoot for DTC B14B8 first.
Click here
PROCEDURE
1. |
CHECK FOR DTC |
(a) Check for DTCs.
Click here
Body Electrical > Air Conditioner > Trouble Codes
Result |
Proceed to |
---|---|
DTC B14B8 is output |
A |
DTC B14B8 is not output |
B |
A |
GO TO DTC B14B8 |
|
2. |
CHECK REFRIGERANT SHORTAGE |
(a) Prepare the vehicle according to the table below.
Measurement Condition:
Item |
Condition |
---|---|
A/C switch |
On |
Ambient temperature* |
0 to 49°C (32 to 120°F) |
Blower speed |
HI |
*: If the ambient temperature is not within the range shown, do not perform this check.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.
Body Electrical > Air Conditioner > Utility
Tester Display |
---|
Refrigerant Gas Volume Check |
Result |
Amount of Refrigerant |
---|---|
Refrigerant shortage |
Insufficient or leakage |
Refrigerant correct |
Correct |
Result |
Proceed to |
---|---|
Insufficient or leakage |
A |
Correct |
B |
B |
GO TO STEP 4 |
|
3. |
REPAIR AIR CONDITIONING SYSTEM LEAK |
(a) Identify the area where refrigerant leaks from.
Click here
(b) Repair the identified area of the air conditioning system.
(c) Evacuate the air conditioning system.
NEXT |
CHARGE SYSTEM WITH REFRIGERANT |
4. |
CHECK REFRIGERANT PRESSURE |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Air Conditioner > Data List
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|---|
Regulator Pressure Sensor |
Air conditioner pressure sensor |
Min.: -456.6 kPaG Max.: 3294.3 kPaG |
Actual refrigerant pressure displayed |
- |
Tester Display |
---|
Regulator Pressure Sensor |
(f) Install a manifold gauge set.
Click here
(g) Read the manifold gauge pressure when the following conditions are met.
(1) Prepare the vehicle according to the table below.
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) |
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.
OK |
CHARGE SYSTEM WITH REFRIGERANT |
|
5. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) 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 |
---|---|---|
A52-3 (+) - A52-1 (-) |
Ignition switch ON |
4.75 to 5.25 V |
NG |
GO TO STEP 10 |
|
6. |
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 |
---|---|---|
A52-1 (-) - Body ground |
Always |
Below 1 Ω |
NG |
GO TO STEP 9 |
|
7. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR) |
(a) Disconnect the F138 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 |
---|---|---|
A52-2 (PR) - F138-24 (PRE) |
Always |
Below 1 Ω |
A52-2 (PR) or F138-24 (PRE) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
INSPECT AIR CONDITIONER PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT) |
(a) Measure the voltage when the following conditions are 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:
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 (evaporator temperature sensor) to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.
(1) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(f) Read the Data List according to the display on the Techstream.
Body Electrical > Air Conditioner > Data List
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|---|
Regulator Pressure Sensor |
Air conditioner pressure sensor |
Min.: -456.6 kPaG Max.: 3294.3 kPaG |
Actual refrigerant pressure displayed |
- |
Tester Display |
---|
Regulator Pressure Sensor |
OK:
The voltage and value displayed in the Data List change.
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 |
B |
REPLACE AIR CONDITIONER PRESSURE SENSOR |
9. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR) |
(a) Disconnect the F138 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 |
---|---|---|
A52-1 (-) - F138-2 (SG-2) |
Always |
Below 1 Ω |
A52-1 (-) or F138-2 (SG-2) - Body ground |
Always |
10 kΩ or higher |
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
10. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONER PRESSURE SENSOR) |
(a) Disconnect the F138 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 |
---|---|---|
A52-3 (+) - F138-6 (S5-3) |
Always |
Below 1 Ω |
A52-3 (+) or F138-6 (S5-3) - Body ground |
Always |
10 kΩ or higher |
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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