How To Proceed With Troubleshooting

HINT:

Use this procedure to troubleshoot the engine immobilizer system.

The hand-held tester should be used in steps 4, 5 and 7.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (See  CUSTOMER PROBLEM ANALYSIS CHECK   ) 
3. CRANK ENGINE FOR MORE THAN 10 SECONDS 
4. 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 (SFI system and engine immobilizer system) by simulating the original activity that the DTC suggested.
      1. If the DTC does not reoccur, proceed to A.
      2. If the DTC (SFI system) reoccurs, proceed to B.
      3. If the DTC (engine immobilizer system) reoccurs, proceed to C.

   B: Go to  HOW TO PROCEED WITH TROUBLESHOOTING  ) 

   C: Go to step   8 

   A 

5. READ VALUE OF HAND-HELD TESTER (IMMOBILIZER ECU (TRANSPONDER KEY ECU ASSY) (SWITCH CONDITION)) 
   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON and push the hand-held tester main switch ON.
   3. Select the item KEY SW in the DATA LIST and read its value displayed on the hand-held tester.

   Transponder key ECU: 

   DATA LIST DISPLAY
   
   

   Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
   KEY SW	Unlock warning switch signal/ON or OFF	ON: Key is in ignition key cylinder OFF: No key is in ignition key cylinder	-

   NG: Go to  DTC B2780  

   OK: Go To Next Step. 

6. (See  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   8 

   A 

7. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. (See PRE-CHECK  )
      1. Inspection with the hand-held tester (ECU DATA MONITOR).
      2. Inspection with the hand-held tester (ACTIVE TEST).
   2. (See TERMINALS OF ECU  )
8. (See  DIAGNOSTIC TROUBLE CODE CHART   ) 
9. ADJUST, REPAIR OR REPLACE 
10. CONFIRMATION TEST 

    END