Up to 08/2009

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER 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 output (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 Immobilizer System.

PROCEDURE

1. CHECK DTC OUTPUT

(a) Clear the DTCs Engine Immobiliser System.

(b) Recheck for DTCs Engine Immobiliser 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
A -- Continue to next step.

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

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

(b) Disconnect the ECM connector.

Standard Voltage:

Text in Illustration

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

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

(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. ECU CODE REGISTRATION

(a) Register the ECU code Engine Immobilizer System.

NEXT -- Continue to next step.

6. CHECK DTC OUTPUT

(a) Clear the DTCs Engine Immobiliser System.

(b) Recheck for DTCs Engine Immobiliser System.

OK:

DTC B279A is not output.

NG -- REPLACE ECM Removal

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