How To Proceed With Troubleshooting

HINT:

Use this procedure to troubleshoot the engine immobilizer system.

1. VEHICLE BROUGHT TO WORKSHOP 
   1. Go to next step.
2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (see  CUSTOMER PROBLEM ANALYSIS CHECK  ) 
   1. Go to next step.
3. CRANK ENGINE FOR MORE THAN 10 SECONDS 
   1. Go to next step.
4. CHECK PTC 
   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) reoccur, proceed to C.
   1. B: Go to SFI SYSTEM (2AZ-FE engine: See  DEFINITION OF TERMS (2AZ-FE)  ) (3MZ-FE engine: See  DEFINITION OF TERMS (3MZ-FE)  ) 
   2. C: Go to step   8 
   3. 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 assy: 

   NORMAL CONDITION DIAGNOSTIC CHART
   
   

   Item	Measurement Item/ Display (Range)	Normal Condition
   KEY Switch	Unlock warning switch signal/ON or OFF	ON: Key is in ignition key cylinder
   KEY Switch	Unlock warning switch signal/ON or OFF	OFF: No key is in ignition key cylinder

   1. NG: Go to DTC B2780 (see  DTC B2780 PUSH SWITCH/KEY UNLOCK WARNING SWITCH MALFUNCTION  ) 
   2. OK: GO TO NEXT STEP. 
6. PROBLEM SYMPTOMS TABLE (see  PROBLEM SYMPTOMS TABLE  ) 
   1. When the problem is not listed on the problem symptoms table, proceed to A.
   2. When the problem is listed on the problem symptoms table, proceed to B.
   1. B: Go to step   8 
   2. A: GO TO NEXT STEP. 
7. PERFORM TROUBLESHOOTING ACCORDING TO MALFUNCTION SYMPTOM 
   1. Pre-check (see PRE-CHECK )
      1. Inspect with the hand-held tester (ECU data monitor).
      2. Inspect with the hand-held tester (ACTIVE TEST).
   2. Terminals of ECU (see TERMINALS OF ECU )
   1. Go to next step.
8. ADJUST, REPAIR OR REPLACE 
   1. Go to next step.
   2. END