How To Proceed With Troubleshooting

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILIZER SYSTEM: 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 with the power switch off.

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. POWER 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 How to Proceed With Troubleshooting
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 LIN Communication System
A -- Continue to next step.

7. CHECK FOR DTCS (ENGINE IMMOBILIZER SYSTEM)*

(a) Check for DTCs and note any codes that are output.

(b) Clear the DTCs Engine Immobilizer System.

(c) Recheck for DTCs. Based on the DTCs output above, try to duplicate the engine immobilizer system DTC by simulating the symptoms indicated by the DTCs.

Result:





B -- GO TO DIAGNOSTIC TROUBLE CODE CHART Engine Immobilizer System
A -- Continue to next step.

8. CHECK FOR DTCS (HYBRID CONTROL SYSTEM)*

(a) Clear the DTCs Hybrid Control System.

(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 hybrid control system.

Result:





B -- GO TO DIAGNOSTIC TROUBLE CODE CHART Engine Immobilizer System

C -- GO TO HYBRID CONTROL SYSTEM Hybrid Control System
A -- Continue to next step.

9. PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table Problem Symptoms Table.

Result:





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

10. OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Data List / Active Test Engine Immobilizer System

(b) Terminals of ECU Engine Immobilizer System

NEXT -- Continue to next step.

11. REPAIR OR REPLACE

NEXT -- Continue to next step.

12. CONFIRMATION TEST

NEXT -- END