How To Proceed With Troubleshooting

HINT:

Use the following procedure to troubleshoot the engine immobilizer system.

*: Use a Techstream.

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 POINTS
   
   

   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 (see DTC CHECK / CLEAR  ).
   3. Recheck for DTCs. Try to duplicate the DTCs (SFI system and engine immobilizer system) by simulating the symptoms indicated by the DTCs.

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      DTC does not recur	A
      DTC (SFI system) recurs	B
      DTC (engine immobilizer system) recurs	C

   B: GO TO DTC CHART (see  DIAGNOSTIC TROUBLE CODE CHART  ) 

   C:  GO TO DTC CHART 

   A: Go to Next Step 

6. READ VALUE USING TECHSTREAM* 
   1. Connect a Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the tester ON.
   4. Enter the following menus: Body Electrical / Immobilizer / Data List.
   5. According to the display on tester, read the "Data List".

      IMMOBILIZER: 

      MEASUREMENT ITEM/RANGE CHART
      
      

      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 REFERENCE
   
   

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

   B:  GO TO STEP  9

   A: Go to Next Step 

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

    NEXT: END