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 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 (DIAGNOSTICS & CIRCUIT TESTS) 

      A: Go to next step 

4. CHECK FOR DTC* 
   1. Check for DTCs and note any codes that are output.

      HINT: 

      Refer to DTC CHECK / CLEAR .

   2. Clear the DTCs.
   3. Recheck for DTCs. Based on the DTCs output above, try to force the A/C system to output DTCs by simulating the conditions indicated by the DTC.

      Result

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

      B → Go to step 7 

      A: Go to next step 

5. PROBLEM SYMPTOMS TABLE 
   1. 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 7 

      A: Go to next step 

6. OVERALL ANALYSIS AND TROUBLESHOOTING* 
   1. Refer to DATA LIST / ACTIVE TEST 
   2. Refer to TERMINALS OF ECU 
   3. On-Vehicle Inspection
   4. Inspection

      NEXT: Go to next step 

7. ADJUST, REPAIR OR REPLACE 

   NEXT → END