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DTC B1079: A/C Refrigerant leak
 
 
 
 
DTC SET CONDITION
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).
 
 
TROUBLESHOOTING HINTS
  • Inadequate refrigerant level
  • Malfunction of the A/C pressure sensor
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
  • Malfunction of the heater controller assembly (A/C-ECU)
 
 
 
DIAGNOSIS
Required Special Tools:
  • MB991658: TEST Harness Set
STEP 1. Check the condenser assembly.
Check that the condenser assembly is not wet.
Is the check result normal?
Go to Step 2.
Wait until the condenser is dry, and check that no diagnostic trouble code is set.
 
STEP 2. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the electric motor switch to the OFF position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ".
(2) Turn the electric motor switch to the ON position.
(3) Diagnose the CAN bus line.
(4) Turn the electric motor switch to the OFF position.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the DTC is set.
Check that the DTC related to the A/C is not set.
Is the DTC set?
Carry out the DTC procedures (Refer to ).
Go to Step 4.
 
STEP 4. Check the A/C pressure sensor.
Refer to .
Is the check result normal?
Go to Step 5.
Replace the A/C pressure sensor (Refer to ).
 
STEP 5. Refrigerant level check.
Refer to .
Is the check result normal?
Go to Step 6.
Correct the refrigerant level.
 
STEP 6. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Electric motor switch: OFF to ON
(3) Check the DTC.
Is the DTC set?
Refer to Inspection Procedure 9: A/C pressure sensor system .
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).