Engine Immobiliser System (w/ Smart Key System)

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (w/ Smart Key System): B279A: Theft Deterrent System Communication Line High Fixation
B279A - Theft Deterrent System Communication Line High Fixation

DESCRIPTION

If the communication line (EFIO-IMI) to the ID code box is stuck on HI output, the ECM stores this DTC.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
- When the ID code box is replaced, refer to Registration Engine Immobiliser System (W/ Smart Key System).
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTCs Engine Immobiliser System (w/ Smart Key System).

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTCs Engine Immobiliser System (w/ Smart Key System).

HINT
If DTCs other than DTC B279A are output, troubleshoot those DTCs first.

Result

C -- CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

B -- Go to DIAGNOSTIC TROUBLE CODE CHART Engine Immobiliser System (w/ Smart Key System)

A -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

3. CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

(a) Disconnect the F72 box connector.

(b) Disconnect the F50 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK ID CODE BOX (OUTPUT)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

Measurement Condition

OK:

Waveform is output normally (refer to illustration).

NG -- CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)

OK -- REPLACE ECM Removal

5. CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)

(a) Disconnect the F72 box connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. REPLACE ID CODE BOX

(a) Replace the ID code box Removal.

NEXT -- Continue to next step.

7. REGISTER RECOGNITION CODES

(a) Register the recognition codes in the ECUs Engine Immobiliser System (W/ Smart Key System).

NEXT -- Continue to next step.

8. REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID Engine Immobiliser System (W/ Smart Key System).

NEXT -- Continue to next step.

9. CLEAR DTC

(a) Clear the DTCs Engine Immobiliser System (w/ Smart Key System).

NEXT -- Continue to next step.

10. CHECK FOR DTC

(a) Check for DTCs Engine Immobiliser System (w/ Smart Key System).

OK:

DTC B279A is not output.

NG -- REPLACE ECM Removal

OK -- END (ID CODE BOX IS DEFECTIVE)