How To Proceed With Troubleshooting

HINT:

• Use the following procedures to troubleshoot the air conditioning system.
• *: Use the intelligent tester.

1. VEHICLE BROUGHT TO WORKSHOP 
2. INSPECT BATTERY VOLTAGE 
   1. Inspect the 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 MULTIPLEX COMMUNICATION SYSTEM (BEAN)* 
   1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

      Result 

      RESULT REFERENCE
      
      

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

   B : Go to  MULTIPLEX COMMUNICATION SYSTEM 

   A : Go to next step 

4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* 
   1. Use the intelligent tester 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 

   A : Go to next step 

5. CHECK FOR DTC* 
   1. Check for DTCs and note any codes that are output.
   2. Delete the DTCs.
   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 REFERENCE
      
      

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

   B : Go to step  8

   A : Go to next step 

6. PROBLEM SYMPTOMS TABLE 
   1. Refer to thePROBLEM 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