Engine Immobiliser System (w/ Smart Key System)

ENGINE IMMOBILISER: 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 (immobiliser code ECU) is stuck high (e. g. shorted to +B), the ECM stores this DTC.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID Engine Immobiliser System (W/ Smart Key System).

PROCEDURE

1. CHECK DTC OUTPUT

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

(b) Recheck for DTCs Engine Immobiliser System (w/ Smart Key System).

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

Result:

B -- GO TO DIAGNOSTIC TROUBLE CODE CHART Engine Immobiliser System (w/ Smart Key System)
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)

(a) Disconnect the ID code box (immobiliser code ECU) connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Standard Voltage:

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

3. CHECK ID CODE BOX (IMMOBILISER CODE ECU) (OUTPUT)

(a) Reconnect the ID code box (immobiliser code ECU) connector.

(b) Reconnect the ECM connector.

OK:

Waveform is output normally (see illustration).

Text in Illustration

NG -- REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

OK -- REPLACE ECM Removal

4. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

(a) Replace the ID code box (immobiliser code ECU) Removal.

NEXT -- Continue to next step.

5. REGISTER ECU CODE

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

NEXT -- Continue to next step.

6. REGISTER ECU COMMUNICATION ID

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

NEXT -- Continue to next step.

7. CHECK DTC OUTPUT

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

(b) Recheck for DTCs Engine Immobiliser System (w/ Smart Key System).

OK:

DTC B279A is not output.

NG -- REPLACE ECM Removal

OK -- END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)