How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the engine immobilizer system.
• The Techstream 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 Techstream 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 SECTION

   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 CHART
      
      

      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 DTC CHART 

   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. DATA LIST/ACTIVE TEST (See DATA LIST / ACTIVE TEST  ).
   2. Terminals of ECU (See TERMINALS OF ECU  ).
7. ADJUST, REPAIR OR REPLACE 
8. CONFIRMATION TEST 

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