How To Proceed With Troubleshooting

HINT:

Use this procedure to troubleshoot the engine immobilizer system.

The hand-held tester should be used in steps 4, 5 and 7.

1. VEHICLE BROUGHT TO WORKSHOP 
   • GO TO NEXT STEP 
2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (See  CUSTOMER PROBLEM ANALYSIS CHECK   ) 
   • GO TO NEXT STEP 
3. CRANK ENGINE FOR MORE THAN 10 SECONDS 
   • 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 (SFI system and engine immobilizer system) by simulating the original activity that the DTC suggested.
      1. If the DTC does not reoccur, proceed to A.
      2. If the DTC (SFI system) reoccurs, proceed to B.
      3. If the DTC (engine immobilizer system) reoccurs, proceed to C.

   B: Go to SFI SYSTEM (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 

   C: Go to step   8 

   A: Go to next step. 

5. READ VALUE OF HAND-HELD TESTER (IMMOBILIZER ECU (TRANSPONDER KEY ECU ASSY) (SWITCH CONDITION)) 
   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON and push the hand-held tester main switch ON.
   3. Select the item KEY SW in the DATA LIST and read its value displayed on the hand-held tester.

      Transponder key ECU 

      Fig 1: Transponder Key ECU Chart

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   OK: Go to next step. 

6. PROBLEM SYMPTOMS TABLE (See  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. Pre-check (See PRE-CHECK  )
      1. Inspection with the hand-held tester (ECU DATA MONITOR).
      2. Inspection with the hand-held tester (ACTIVE TEST).
   2. Terminals of ECU (See TERMINALS OF ECU  )
8. DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART   ) 
   • GO TO NEXT STEP 
9. ADJUST, REPAIR OR REPLACE 
   • GO TO NEXT STEP 
10. CONFIRMATION TEST 

    END