How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the engine immobilizer system.
• *: Use the intelligent tester.

1. VEHICLE BROUGHT TO WORKSHOP 

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2. CRANK ENGINE FOR MORE THAN 10 SECONDS 

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3. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN)* 
   1. Using the intelligent tester, check if the Multiplex Communication System (MPX) is functioning normally (see DATA LIST / ACTIVE TEST  ).

   Result: 

   PROBLEM SYMPTOM CHART
   
   

   Result	Proceed to
   MPX DTC is not output	A
   MPX DTC is output	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 DATA LIST / ACTIVE TEST  ).
   2. Delete the DTC.
   3. Recheck for DTCs. Based on the DTCs output above, try to force output of the same SFI system DTC or engine immobilizer system DTC by simulating the symptoms indicated by the DTC.

   Result: 

   PROBLEM SYMPTOM CHART
   
   

   Result	Proceed to
   DTC output does not reoccur	A
   SFI system (3GR-FSE) DTC output reoccurs	B
   SFI system (3UZ-FE) DTC output reoccurs	C
   Engine immobilizer system DTC output reoccurs	D

   B : Go to SFI SYSTEM (3GR-FSE) 

   C : Go to SFI SYSTEM (3UZ-FE) 

   D : Go to step   7 

   A : GO TO NEXT STEP 

5. PROBLEM SYMPTOMS TABLE 

   Result: 

   PROBLEM SYMPTOM CHART
   
   

   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. DATA LIST / ACTIVE TEST 
   2. TERMINALS OF ECU 

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7. ADJUST, REPAIR OR REPLACE 

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8. CONFIRMATION TEST 

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   END