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 is stuck on HI output, the ECM stores this DTC.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT

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

(b) Recheck for DTCs.

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 - ECM)

(a) Disconnect the E50 ID code box and A24 ECM connectors.

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

Resistance:

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

3. CHECK ID CODE BOX (WAVEFORM)

(a) Reconnect the E50 ID code box and A24 ECM connectors.

(b) Using an oscilloscope, check the waveform.

Waveform (Reference):

OK:

Normal waveform is output (see illustration).

NG -- REPLACE ID CODE BOX

OK -- REPLACE ECM (for 2AR-FE) Removal

4. REPLACE ID CODE BOX

(a) Replace the ID code box Removal.

NEXT -- Continue to next step.

5. ECU CODE REGISTRATION

(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.

OK:

DTC B279A is not output.

NG -- REPLACE ECM (for 2AR-FE) Removal

OK -- END (ID CODE BOX WAS DEFECTIVE)