Dtc B1423/23 Pressure Sensor Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK REFRIGERANT
READ VALUE USING TECHSTREAM (REGULATOR PRESSURE SENSOR)
CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER)
INSPECT AIR CONDITIONING AMPLIFIER
INSPECT AIR CONDITIONING PRESSURE SENSOR
DTC B1423/23 Pressure Sensor Circuit |
DESCRIPTION
This DTC is output when the refrigerant pressure is either extremely low (0.19 Mpa [2.0 kgf/cm2, 28 psi] or less) or extremely high (3.14 Mpa [32.0 kgf/cm2, 455 psi] or more). The pressure sensor, which is installed on the pipe of the high pressure side, detects the refrigerant pressure and sends a refrigerant pressure signal to the air conditioning amplifier. The air conditioning amplifier determines the pressure from the signals in accordance with the sensor characteristics, and controls the compressor. DTC No.
| DTC Detection Condition
| Trouble Area
|
B1423/23
| Open or short in pressure sensor circuit
| - Air conditioning pressure sensor
- Harness and connector between air conditioning pressure sensor and air conditioning amplifier
- Air conditioning amplifier
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Check the sight glass of the cooler unit refrigerant liquid pipe.
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
|
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
| -
|
- HINT:
- *: If the ambient temperature is higher than usual but cooling is sufficient, bubbles in the sight glass are permissible.
| 2.READ VALUE USING TECHSTREAM (REGULATOR PRESSURE SENSOR) |
Warm up the engine.
Turn the ignition switch to OFF.
Connect the Techstream to the DLC3.
Turn the ignition switch ON and turn the Techstream main switch ON.
Turn the ignition switch to ON.
Turn the tester on.
Select the following menus: Body Electrical / Air Conditioner / Data List /
According to the display on tester, read the "Data List".
- Data List / Air Conditioner:
Tester Display
| Measure Item/Range
| Normal Condition
| Diagnostic Note
|
Regulator Pressure Sensor
| Regulator Pressure Sensor /
Min.: 0 kgf / cm 2G,
Max.: 38.25 kgf / cm 2G
| Actual regulator pressure is displayed
| -
|
- OK:
- The display is as specified in the normal condition column.
- Result:
Result
| Proceed to
|
NG
| A
|
OK (When troubleshooting according to PROBLEM SYMPTOMS TABLE)
| B
|
OK (When troubleshooting according to the DTC)
| C
|
| 3.CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER) |
Disconnect the A3 air conditioning pressure sensor connector.
Disconnect the E8 air conditioning amplifier connector.
Measure the resistance.
- Standard resistance:
Tester Connection
| Specified Condition
|
A3-1 (-) - E8-11 (SG-1)
| Below 1 Ω
|
A3-2 (PR) - E8-6 (PRE)
| Below 1 Ω
|
A3-3 (+) - E8-1 (S5-3)
| Below 1 Ω
|
A3-1 (-) - Body ground
| 10 kΩ or higher
|
A3-2 (PR) - Body ground
| 10 kΩ or higher
|
A3-3 (+) - Body ground
| 10 kΩ or higher
|
Reconnect the air conditioning pressure sensor connector.
Reconnect the air conditioning amplifier connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.INSPECT AIR CONDITIONING AMPLIFIER |
Remove the air conditioning amplifier with its connectors still connected.
Measure the resistance.
- Standard resistance:
Tester Connection
| Specified Condition
|
E8-11 (SG-1) - E8-12 (GND)
| Below 1 Ω
|
Turn the ignition switch ON.
Measure the voltage.
- Standard voltage:
Tester Connection
| Specified Condition
|
E8-1 (S5-3) - E8-11 (SG-1)
| 4.5 to 5.5 V
|
Reinstall the air conditioning amplifier.
| 5.INSPECT AIR CONDITIONING PRESSURE SENSOR |
Remove the air conditioning amplifier with its connectors still connected.
Set the manifold gauge.
Warm up the engine.
Turn the A/C switch ON.
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
|
Reinstall the air conditioning amplifier.
| | REPLACE LIQUID TUBE SUB-ASSEMBLY A (AIR CONDITIONING PRESSURE SENSOR) |
|
|
