B279A

ENGINE IMMOBILIZER: ENGINE IMMOBILIZER 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 outputs this DTC.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Engine Immobilizer System.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Recheck for DTC Engine Immobilizer System.

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

Result:





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

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

(a) Disconnect the L32 box connector.





(b) Disconnect the A13 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.

4. CHECK ECM (INPUT)

(a) Measure the waveform.





Waveform 1 (Reference):





OK:

Waveform is output normally (see illustration).

NG -- CHECK ID CODE BOX (POWER SOURCE AND BODY GROUND)

OK -- REPLACE ID CODE BOX Removal

5. CHECK ID CODE BOX (POWER SOURCE AND BODY GROUND)





(a) Turn engine switch on (IG).

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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal