How To Proceed With Troubleshooting

HINT:

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

1. VEHICLE BROUGHT TO WORKSHOP 

   NEXT 

2. INSPECT BATTERY VOLTAGE 

   Standard: 

   11 to 14 V 

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

   NEXT 

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
      
      

      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
      
      

      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 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
      
      

      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 

   Refer to PROBLEM SYMPTOMS TABLE  .

   Result 

   RESULT
   
   

   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 
   2. DATA LIST / ACTIVE TEST 
   3. TERMINALS OF ECU 
   4. On-vehicle Inspection
   5. Inspection

   NEXT 

8. ADJUST, REPAIR OR REPLACE 

   NEXT 

   END