How To Proceed With Troubleshooting

HINT: 

• Use the following procedure to troubleshoot the air conditioning system.
• *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP 

   NEXT: Go to next step 

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.

      NEXT: Go to next step 

3. CHECK COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)* 
   1. Use the Techstream to check if the Multiplex Communication System (MPX) is functioning normally.

      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 Techstream to check if the CAN Communication System is functioning normally.

      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. Clear 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	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 Problem Symptoms Table. Refer to PROBLEM SYMPTOMS TABLE .

      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. Refer to ACTUATOR CHECK
   2. Data List / Active Test. Refer to DATA LIST / ACTIVE TEST 
   3. Terminals of ECU. Refer to TERMINALS OF ECU 
   4. On-vehicle Inspection
   5. Inspection

      NEXT: Go to next step 

8. ADJUST, REPAIR OR REPLACE 

   NEXT → END