How To Proceed With Troubleshooting

HINT:

• Use the following procedure to troubleshoot the engine immobiliser system.
• Techstream should be used in steps  5,  6, and  8.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CUSTOMER PROBLEM ANALYSIS CHECK 

   HINT:

   • In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
   • Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
   • The following 5 items are important points in the problem analysis:
     PROBLEM ANALYSIS CHART
     
     

     What	Vehicle model, system name
     When	Date, time, occurrence frequency
     Where	Road conditions
     Under what conditions?	Driving conditions, weather conditions
     How did it happen?	Problem symptoms

3. INSPECT BATTERY VOLTAGE 
   1. Measure the battery voltage.

      Standard voltage: 

      11 to 14 V 

      If the voltage is below 11V, recharge or replace the battery before proceeding to the next step.

4. CRANK ENGINE FOR MORE THAN 10 SECONDS 
5. CHECK FOR DTCS 
   1. Check for DTCs and note any codes that are output (See DTC CHECK/CLEAR  ).
   2. Delete the DTCs.
   3. Recheck for DTCs. Try to duplicate the DTCs (SFI system and engine immobiliser system) by simulating the symptoms indicated by the DTCs.

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      DTC (SFI system) recurs	A (See DIAGNOSTIC TROUBLE CODE CHART for 2GR-FE) (See DIAGNOSTIC TROUBLE CODE CHART for 1AR-FE)
      DTC (engine immobiliser system) recurs	B (See DIAGNOSTIC TROUBLE CODE CHART  )
      DTC does not recur	C

      A: GO TO SFI SYSTEM (DTC CHART) 

      B:  GO TO ENGINE IMMOBILISER SYSTEM (DTC CHART) 

      C: Go to next step 

6. READ VALUE ON TECHSTREAM 
   1. Connect Techstream to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Turn the tester on.
   4. Select the following menu items: Body Electrical/Immobiliser/Data List.
   5. Select Key SW in the Data List and read the tester display.

      Immobiliser (Transponder Key ECU): 

      DATA LIST
      
      

      Tester Display	Measurement Item/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	-

      OK: 

      ON (Key is in ignition key cylinder) appears on the screen. 

      NG:  GO TO DTC B2780 

      OK: Go to next step 

7. PROBLEM SYMPTOMS TABLE 

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   Fault is listed in problem symptoms table	A
   Fault is not listed in problem symptoms table	B

   A:  GO TO STEP  9

   B: Go to next step 

8. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. DATA LIST/ACTIVE TEST (See DATA LIST/ACTIVE TEST  )
   2. TERMINALS OF ECU (See TERMINALS OF ECU  )
9. ADJUST, REPAIR OR REPLACE 
10. CONFIRMATION TEST 

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