How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the air conditioning system
• *. Use the intelligent tester or Techstream

1. VEHICLE BROUGHT TO WORKSHOP 
2. INSPECT BATTERY VOLTAGE 

   Standard voltage: 

   11 to 14 V 

   If the voltage is below 11 V, recharge or replace the battery before proceeding.

3. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* 
   1. Use the intelligent tester or Techstream to check if the CAN communication system is functioning normally.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      CAN DTC is not output	A
      CAN DTC is output	B

   B: GO TO CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

   A: Go to next step 

4. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* 
   1. Use the intelligent tester or Techstream to check if the LIN communication system is functioning normally.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      LIN DTC is not output	A
      LIN DTC is output	B

   B: GO TO LIN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

   A: Go to next step 

5. CHECK FOR DTC* 
   1. Check for DTCs (see DTC CHECK / CLEAR  ).
   2. Clear the DTC (see DTC CHECK / CLEAR  ).
   3. Based on the DTCs output above, try to force output of the A/C system DTC by simulating the operation indicated by the DTC. Recheck for DTCs.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      DTC is not output	A
      DTC is output	B

   B: GO TO DTC CHART 

   A: Go to next step 

6. PROBLEM SYMPTOMS TABLE 
   1. Refer to the PROBLEM SYMPTOMS TABLE  .

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      Fault is not listed in problem symptoms table	A
      Fault is listed in problem symptoms table	B

   B: GO TO STEP  8

   A: Go to next step 

7. OVERALL ANALYSIS AND TROUBLESHOOTING* 
   1. Actuator Check (see ACTUATOR CHECK  )
   2. Data List / Active Test (see DATA LIST / ACTIVE TEST  )
   3. Terminals of ECU (see TERMINALS OF ECU  )
   4. On-vehicle Inspection
   5. Inspection
8. ADJUST, REPAIR OR REPLACE 

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