How To Proceed With Troubleshooting

HINT:

Use this procedure to troubleshoot the engine immobilizer system.

The intelligent tester should be used in steps 4, 5 and 7.

VEHICLE BROUGHT TO WORKSHOP
NEXT: GO TO NEXT STEP
CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK
NEXT: GO TO NEXT STEP
CRANK ENGINE FOR MORE THAN 10 SECONDS
NEXT: GO TO NEXT STEP
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 in ( a), try to force output of the same SFI system DTC or engine immobilizer system DTC by simulating the original activity 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

READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and push the intelligent tester main switch ON.

On the intelligent tester, enter the following menus: DIAGNOSIS/OBD MOBD/DATA LIST/IMMOBILIZER/KEY SW. Read the values.

Transponder key ECU assembly

TRANSPONDER KEY ECU REFERENCE TABLE

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

OK: "ON" (key is in ignition key cylinder) appears on the screen.

NG: Go to DTC B2780

OK: GO TO NEXT STEP

PROBLEM SYMPTOMS TABLE
1. If the fault is not listed in the problem symptoms table, proceed to A.
2. If the fault is listed in the problem symptoms table, proceed to B.
B: Go to step 8

A: Go To Next Step
OVERALL ANALYSIS AND TROUBLESHOOTING
1. See DATA LIST/ACTIVE TEST
  1. Inspection with the intelligent tester (DATA LIST)
  2. Inspection with the intelligent tester (ACTIVE TEST)
2. See TERMINALS OF ECU
NEXT: GO TO NEXT STEP
ADJUST, REPAIR OR REPLACE
NEXT: GO TO NEXT STEP
CONFIRMATION TEST