How To Proceed With Troubleshooting

HINT:

• Use the following procedure to troubleshoot the engine Immobilizer system.
• *: Using the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CUSTOMER PROBLEM ANALYSIS 

   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:
     VEHICLE MODEL REFERENCE
     
     

     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.
   2. Clear the DTCs.
   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 for 2ZR-FE) recurs	B
   DTC (SFI system for 2AZ-FE) recurs	C
   DTC (engine Immobilizer system) recurs	D

   B: See DIAGNOSTIC TROUBLE CODE CHART

   C: See DIAGNOSTIC TROUBLE CODE CHART

   D: See  DIAGNOSTIC TROUBLE CODE CHART  

   A: Go to Next Step 

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

   Immobilizer (Transponder Key ECU Assembly) 

   ITEM/RANGE REFERENCE 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 the Techstream screen, the item changes between ON and OFF according to the chart above  .

   NG: Go to DTC B2780 (See  DTC B2780 PUSH SWITCH / KEY UNLOCK WARNING SWITCH MALFUNCTION  ) 

   OK: Go to Next Step 

7. PROBLEM SYMPTOMS TABLE 
   1. Refer to Problem Symptoms Table (See PROBLEM SYMPTOMS TABLE ).

   Result 

   RESULT REFERENCE
   
   

   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. See DATA LIST / ACTIVE TEST 
   2. See TERMINALS OF ECU 
9. REPAIR OR REPLACE 
10. CONFIRMATION TEST