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 11V, recharge or replace the battery before proceeding.

3. INSPECT ELECTRIC POWER CONTROL SYSTEM* 
   1. Using the intelligent tester or Techstream, check the electric power control system's load control history (See OPERATION CHECK ).
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 

      COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM
      
      

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

      Result 

      COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM
      
      

      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 

6. CHECK FOR DTC* 
   1. Check for DTCs and note any codes that are output.
   2. Delete the DTC.
   3. Recheck for DTCs. Based on the DTCs output above, try to force output of the A/C system DTC by simulating the operation indicated by the DTC.

      Result 

      RESULT CHART
      
      

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

   B: GO TO STEP   9 

   A: GO TO NEXT STEP 

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

      Result 

      RESULT CHART
      
      

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

   B: GO TO STEP   9 

   A: GO TO NEXT STEP 

8. 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
9. ADJUST, REPAIR OR REPLACE 

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