Code No. B1079: A/C Refrigerant leaks

COMMENTS ON TROUBLE SYMPTOM

If this code is set, the refrigerant level may not be appropriate, or the A/C pressure sensor may be faulty (If this code is set, 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 set.

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 set?

	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 reset

Q. Is the diagnosis code set?

	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 ).