How To Proceed With Troubleshooting

HINT:

Use this procedure to troubleshoot the engine immobilizer system.

Techstream 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 DTCS 
   1. Check for DTCs and note any codes that are output.
   2. Delete the DTC.
   3. Recheck for DTCs. Based on the DTC output, try to force output of the same SFI system DTC or engine immobilizer system DTC by simulating the operation indicated by the DTC.
      1. If the DTC does not reoccur, proceed to A.
      2. If the SFI system DTC reoccurs, proceed to B.
      3. If the engine immobilizer system DTC reoccurs, proceed to C.

   B: Go to SFI SYSTEM 

   C: Go to step  8

   A: Go to next step 

5. READ VALUE OF TECHSTREAM 
   1. Connect Techstream to the DLC3.
   2. Turn the ignition switch ON.
   3. Turn the tester on.
   4. Select the following menu items: Body Electrical/Immobilizer/Data List.
   5. Read the Data List according to the display on the tester.

   Immobilizer: 

   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 Push Switch/Key Unlock Warning Switch Malfunction  

   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. DATA LIST/ACTIVE TEST (See DTC CHECK/CLEAR )
   2. TERMINALS OF ECU (See TERMINALS OF ECU )
8. ADJUST, REPAIR OR REPLACE 
9. CONFIRMATION TEST 

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