How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the multiplex communication system.
• *: Use the intelligent tester.

1. VEHICLE BROUGHT TO WORKSHOP 
   • GO TO NEXT STEP 
2. INSPECT BATTERY VOLTAGE 

   Standard voltage: 11 to 14 V 

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

   • GO TO NEXT STEP 
3. CHECK FOR DTC* 
   1. Check for DTCs and note any codes that are output.
   2. Delete the DTC.
   3. Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.

      Result: 

      DTC
      
      

      Result	Proceed to
      DTC does not reoccur	A
      DTC reoccurs	B

      • B: Go to step 4 
      • A: GO TO NEXT STEP 
4. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. TERMINALS OF ECU 
5. ADJUST, REPAIR OR REPLACE 
   • GO TO NEXT STEP 
6. CONFIRMATION TEST 
   • END