Dtc B1423/23 Pressure Sensor Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK REFRIGERANT

READ VALUE USING INTELLIGENT TESTER (REG PRESS SENS)

CHECK WIRE HARNESS (PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER)

CHECK AIR CONDITIONING AMPLIFIER

INSPECT AIR CONDITIONING PRESSURE SENSOR

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Check the sight glass of the cooler unit refrigerant liquid pipe.
   

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

      Item	Condition
      Engine Speed	1500 rpm
      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*	Check for gas leakage and repair if necessary 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	Check for gas leakage with gas leak detector and repair if necessary 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	Refrigerant becomes clear immediately after A/C turned OFF	Too much	Drain or discharge refrigerant Bleed air and supply proper amount of purified refrigerant
      6	Refrigerant foams and then becomes clear immediately after A/C turned OFF	Correct	-

      HINT:

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

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch on (IG) and turn the intelligent tester main switch ON.
   

3. Select the item below in the Data List, and read the value displayed on the intelligent tester.
   

Air conditioning amplifier:

Item	Measure Item / Display (Range)	Normal Condition	Diagnostic Note
Reg Press Sens	Regulator pressure sensor / Min.: 0 MPaG Max.: 3.187 MPaG	Actual regulator pressure is displayed	-

OK:

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

1. Disconnect the A32 pressure sensor connector.
   

2. Disconnect the E41 amplifier connector.
   

3. Measure the resistance of the wire harness side connectors.
   

   Standard resistance:

   Tester Connection	Specified Condition
   A32-3 (+) - E41-10 (S5-3)	Below 1 Ω
   A32-2 (PR) - E41-9 (PRE)	Below 1 Ω
   A32-1 (-) - E41-13 (SG-2)	Below 1 Ω
   A32-3 (+) - Body ground	1 MΩ or higher
   A32-2 (PR) - Body ground	1 MΩ or higher
   A32-1 (-) - Body ground	1 MΩ or higher

1. Remove the air conditioning amplifier with its connectors still connected.
   

2. Measure the resistance of the wire harness side connector.
   

   Standard resistance:

   Tester Connection	Specified Condition
   E41-13 (SG-2) - Body ground	Below 1 Ω

3. Turn the ignition switch on (IG).
   

4. Measure the voltage of the wire harness side connector.
   

   Standard voltage:

   Tester Connection	Specified Condition
   E41-10 (S5-3) - E41-13 (SG-2)	4.5 to 5.5 V

1. Turn the A/C switch ON.
   

2. Disconnect the A32 sensor connector.
   

3. Connect the three 1.5 V dry cell batteries' positive (+) lead to terminal 3 and the negative (-) lead to terminal 1. Then connect the voltmeter's positive (+) lead to terminal 2 and the negative (-) lead to terminal 1. Measure the voltage.
   

   OK:

   The voltage changes in accordance with the refrigerant pressure as shown in the graph.