How To Proceed With Troubleshooting

HINT:

Use this procedure to troubleshoot the engine immobilizer system.

Techstream should be in used steps  3,  4,  5 and  7.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CHECK HYBRID CONTROL SYSTEM 
   1. Check hybrid control system.

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      When the ignition switch is turned to the ACC or ON position, the vehicle does not respond normally and the hybrid control system also does not start.	A
      When the ignition switch is turned to the ACC or ON position, the vehicle responds normally, but the hybrid control system does not start.	B

   B:  Go to HYBRID CONTROL SYSTEM

   A: Go to next step 

3. INSPECT COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
   1. Use Techstream to check for normal function of the multiplex communication system.
      1. (ECU unconnected, communication line malfunctioning) With out code outputs, proceed to A.
      2. (ECU unconnected, communication line malfunctioning) With code outputs, proceed to B.

   B:  Go to MULTIPLEX COMMUNICATION SYSTEM

   A: Go to next step 

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 by simulating the original activity that the DTC suggested.
      1. If DTC does not reoccurs, proceed to A.
      2. If DTC reoccurs, proceed to B (See DIAGNOSTIC TROUBLE CODE CHART  ).

   B: Go to DTC CHART 

   A: Go to next step 

5. READ VALUE OF TECHSTREAM 
   1. Connect Techstream to the DLC3.
   2. Turn the ignition switch on and turn the tester on.
   3. Select item Key SW in the Data List and read the value displayed on Techstream.

      Immobilizer: 

      DIAGNOSTIC NOTE
      
      

      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: Both ON (Key is in ignition key cylinder) and OFF (No key is in ignition key cylinder) appear on the screen. 

   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: After repair, go to step  8

   A: Go to next step 

7. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. Data list / Active test (See DATA LIST / ACTIVE TEST  ).
   2. Terminals of ECU (See TERMINALS OF ECU  ).
8. ADJUST, REPAIR OR REPLACE 
9. CONFIRMATION TEST 

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