A/C Pressure Switch Circuit Troubleshooting (Without Climate Control)

A/C Pressure Switch Circuit Troubleshooting

NOTE:

- Do not use this troubleshooting procedure if any of the following items are operative; A/C condenser fan, radiator fan, A/C compressor. Refer to the symptom troubleshooting index.
- Before performing symptom troubleshooting, check for powertrain DTCs Initial Inspection and Diagnostic Overview.
- If the blower motor does not run at all speeds, the A/C compressor will be inoperative. Before performing any other troubleshooting, repair the cause of the inoperative blower motor.

1. Check for body DTCs using B-CAN system diagnosis test mode A troubleshooting Troubleshooting - B-CAN System Diagnosis Test Mode A.

Are there any DTCs indicated?

YES -

Do the appropriate troubleshooting for the DTC indicated.�

NO -

Go to step 2.

2. Check that the front blower motor operates at all speeds.

Does the front blower motor operate at all speeds?

YES -

Go to step 3.

NO -

Repair the problem in the front blower motor circuit.�

3. Disconnect the A/C pressure switch 4P connector.

4. Turn the ignition switch to ON (II).

5. Measure the voltage between A/C pressure switch 4P connector terminal No. 1 and body ground.





Is there 5 V or more?

YES -

Go to step 6.

NO -

Repair an open in the wire between the relay control module and the A/C pressure switch.�

6. Turn the ignition switch to LOCK (0).

7. Check for continuity between A/C pressure switch terminals No. 1 and No. 4.





Is there continuity?

YES -

Go to step 8.

NO -

Go to step 16.

8. Reconnect the A/C pressure switch 4P connector.

9. Disconnect A/C control panel connector A (22P).

10. Turn the ignition switch to ON (II).

11. Measure the voltage between A/C control panel connector A (22P) terminal No. 4 and body ground.





Is there 5 V or more?

YES -

Go to step 12.

NO -

Repair an open in the wire between the A/C control panel and the A/C pressure switch.�

12. Turn the ignition switch to LOCK (0).

13. Measure the evaporator temperature sensor resistance between A/C control panel connector A (22P) terminals No. 3 and No. 14.





Is the resistance less than 24 kOhms?

YES -

Go to step 14.

NO -

Test the evaporator temperature sensor Evaporator Temperature Sensor Test.�

14. Reconnect A/C control panel connector A (22P).

15. Turn the ignition switch to ON (II).

16. Check for proper A/C system pressure.

Is the pressure within specifications?

YES -

Replace the A/C pressure switch.�

NO -

Repair the A/C pressure problem.�