How To Proceed With Troubleshooting

HINT:

• Use this procedure to troubleshoot the engine immobilizer system.
• The intelligent tester should be used in steps  4,  5 and  7.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM 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  SFI SYSTEM 

   C : Go to step   8 

   A : Go to next step 

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

   Transponder key ECU 

   TRANSPONDER KEY ECU
   
   

   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. 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 : Go to next step 

7. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. Inspection with the intelligent tester (ECU DATA MONITOR).
   2. Inspection with the intelligent tester (ACTIVE TEST).
   3. TERMINALS OF ECU  .
8. ADJUST, REPAIR OR REPLACE 
9. CONFIRMATION TEST 

   END