How To Proceed With Troubleshooting

HINT:

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

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. 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 (See HOW TO PROCEED WITH TROUBLESHOOTING )

   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 (See HOW TO PROCEED WITH TROUBLESHOOTING )

   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 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 

   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. See ACTUATOR CHECK 
   2. See DATA LIST / ACTIVE TEST 
   3. See TERMINALS OF ECU 
   4. On-vehicle Inspection
   5. Inspection
8. ADJUST, REPAIR OR REPLACE 

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