How To Proceed With Troubleshooting

HINT:

Use these procedures to troubleshoot the air conditioning system.

1. VEHICLE BROUGHT TO WORKSHOP 
2. INSPECT BATTERY VOLTAGE 

   Standard voltage: 10 to 14 V 

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

3. CHECK COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
   1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

      Result 

      RESULT CHART
      
      

      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 CAN COMMUNICATION SYSTEM 
   1. Use the intelligent tester to check if the CAN Communication System is functioning properly.

      Result 

      RESULT CHART
      
      

      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 DTC output in above, try to force output of the audio 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  8

   A: Go to next step. 

6. 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  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. (see ON-VEHICLE INSPECTION  )
   5. Inspection
8. ADJUST, REPAIR OR REPLACE 

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