How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the engine immobilizer system.
• The intelligent tester should be used in steps  3,  4 and  6.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CRANK ENGINE FOR MORE THAN 10 SECONDS 
3. INSPECT COMMUNICATION FUNCTION MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
   1. Use the intelligent tester to check for normal function of the multiplex communication system (BEAN).
      1. (ECU connected, communication line malfunctioning) Without code outputs, proceed to A.
      2. (ECU connected, communication line malfunctioning) With code outputs, proceed to B.

   B: Go to  MULTIPLEX COMMUNICATION SYSTEM 

   A: Go to next step 

4. CHECK FOR DTC 
   1. Check for DTCs and note any codes that are output (See DTC CHECK/CLEAR  ).
   2. Delete the DTC.
   3. Recheck for DTCs. Based on the DTCs output above, try to duplicate the SFI system DTC or engine immobilizer system DTC by simulating the symptoms indicated by the DTC.

   Result 

   RESULT TABLE
   
   

   Result	Proceed to
   DTC output does not reoccur	A
   SFI system DTC output reoccurs	B
   Engine immobilizer system DTC output reoccurs	C

   B: Go to  SFI SYSTEM 

   C: Go to  DIAGNOSTIC TROUBLE CODE TABLE  

   A: Go to next step 

5. PROBLEM SYMPTOMS TABLE 
   1. If the fault is not listed on the problem symptoms table, proceed to A.
   2. If the fault is listed on the problem symptoms table, proceed to B.

   B: Go to step   7 

   A: Go to next step 

6. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. See DATA LIST/ACTIVE TEST  .
   2. See TERMINALS OF ECU  .
7. ADJUST, REPAIR OR REPLACE 
8. CONFIRMATION TEST 

   END