How To Proceed With Troubleshooting

THEFT DETERRENT / KEYLESS ENTRY: ENGINE Immobilizer SYSTEM (w/ Smart Key System): HOW TO PROCEED WITH TROUBLESHOOTING

HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
- Use the following procedure to troubleshoot the engine Immobilizer system.
- *: Using the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP
NEXT -- Continue to next step.

2. CUSTOMER PROBLEM ANALYSIS
HINT:
- When troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
- Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

- The following 5 items are important points in the problem analysis:





NEXT -- Continue to next step.

3. INSPECT BATTERY VOLTAGE
(a) Measure the battery voltage.
Standard Voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
NEXT -- Continue to next step.

4. ENGINE SWITCH ON (IG)
NEXT -- Continue to next step.

5. INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*
(a) Use the Techstream to check if the CAN communication system is functioning normally.
Result:





B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.

6. INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*
(a) Use the Techstream to check if the LIN communication system is functioning normally.
Result:





B -- GO TO LIN COMMUNICATION SYSTEM
A -- Continue to next step.

7. CHECK FOR DTCS (SMART KEY SYSTEM)*
(a) Check for DTCs and note any codes that are output.
(b) Clear the DTCs Engine Immobilizer System (w/ Smart Key System).
(c) Recheck for DTCs. Based on the DTCs output above, try to duplicate the engine Immobilizer system DTC or steering lock system DTC by simulating the symptoms indicated by the DTCs.
Result:





B -- GO TO STEERING LOCK SYSTEM
C -- GO TO DIAGNOSTIC TROUBLE CODE CHART
A -- Continue to next step.

8. CHECK FOR DTCS (SFI SYSTEM)*
(a) Clear the DTCs DTC Check / Clear.
(b) Recheck for DTCs.
HINT: The DTCs for the engine Immobilizer system are specified above. If other codes are output, check the DTC chart for the SFI system.

Result:





B -- GO TO DIAGNOSTIC TROUBLE CODE CHART
C -- GO TO SFI SYSTEM
D -- GO TO SFI SYSTEM
A -- Continue to next step.

9. PROBLEM SYMPTOMS TABLE
(a) Refer to Problem Symptoms Table Engine Immobilizer System (w/ Smart Key System).
Result:





B -- Go to step 11
A -- Continue to next step.

10. OVERALL ANALYSIS AND TROUBLESHOOTING*
(a) Data List / Active Test Engine Immobilizer System (w/ Smart Key System)
(b) Terminals of ECU Engine Immobilizer System (w/ Smart Key System)
NEXT -- Continue to next step.

11. REPAIR OR REPLACE
NEXT -- Continue to next step.

12. CONFIRMATION TEST
NEXT -- END