Pressure Switch On-Vehicle Inspection

Check the wire harness.

1. Disconnect the connector from the pressure sensor.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   B4-1 - Body ground	Below 1 Ω

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

   Standard voltage:

   Tester Connection	Specified Condition
   B4-1 - B4-3	5 V

Check the pressure sensor.

1. Set the manifold gauge.
   

2. Connect the connector to the pressure sensor.
   

3. Warm up the engine.
   

4. A/C switch is turned ON.
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   L52-13 (PRE) - L52-38 (SG-2)	0.196 to 3.14 MPa (2.0 to 32 kgf/cm2)	0.73 to 4.85 V

   If the result is not as specified, replace the sensor.
   

Check the wire harness.

1. Disconnect the connector from the pressure sensor.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   A51-1 - Body ground	Below 1 Ω

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

   Standard voltage:

   Tester Connection	Specified Condition
   A51-1 - A51-3	5 V

Check the pressure sensor.

1. Set the manifold gauge.
   

2. Connect the connector to the pressure sensor.
   

3. Warm up the engine.
   

4. A/C switch is turned ON.
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   L52-18 (SG-3) - L52-32 (PSW)	0 to 0.98 MPa (0 to 10 kgf/cm2)	0.4 to 4.6 V

   If the result is not as specified, replace the sensor.