Code No. B1079: A/C Refrigerant leaks




COMMENTS ON TROUBLE SYMPTOM


If this code is stored, the refrigerant level may not be appropriate, or the A/C pressure sensor may be faulty (If this code is stored, the A/C indicator will flash).

PROBABLE CAUSES



  • Inadequate refrigerant level
  • Malfunction of the A/C pressure sensor
  • Malfunction of the ambient temperature sensor
  • Damaged wiring harness or connectors
  • Malfunction of the heater controller assembly (A/C-ECU)

DIAGNOSIS PROCEDURE


STEP 1. Check the condenser assembly


Check that the condenser assembly is not wet.

Q. Is the check result normal?

Go to Step 2.
Wait until the condenser is dry, and check that no diagnosis code is stored.

STEP 2. M.U.T.-III CAN bus diagnostics


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 3.
Repair the CAN bus lines. (Refer to GROUP 54C, Troubleshooting ).

STEP 3. M.U.T.-III diagnosis code


Check that the diagnosis code related to the A/C is not set.

Q. Is the diagnosis code stored?

Carry out the diagnosis code procedures. Refer to .
Go to Step 4.

STEP 4. M.U.T.-III data list


Check that the following service data display contents are normal. (Refer to )
Item No.19: Ambient temperature sensor

Q. Is the check result normal?

Go to Step 5.
Refer to Inspection Procedure 5: Ambient temperature sensor system .

STEP 5. Check the A/C pressure sensor


Refer to .

Q. Is the check result normal?

Go to Step 6.
Replace the A/C pressure sensor.

STEP 6. Refrigerant level check


Refer to .

Q. Is the check result normal?

Go to Step 7.
Correct the refrigerant level.

STEP 7. Check whether the diagnosis code is stored again


Q. Is the diagnosis code stored?

Refer to Inspection Procedure 11: A/C pressure sensor system .
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).