B279A
ENGINE IMMOBILISER: 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 is stuck on HI output, the hybrid vehicle control ECU stores this DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK DTC OUTPUT
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(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
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ID CODE BOX - HYBRID VEHICLE CONTROL ECU)
(a) Disconnect the E50 ID code box and A61 hybrid vehicle control ECU connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:
(c) Measure the voltage according to the value(s) in the table below.
Voltage:
NOTICE:
Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
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 A61 hybrid vehicle control ECU connectors.
(b) Using an oscilloscope, check the waveform.
Waveform (Reference):
OK:
Normal waveform is output (see illustration).
NG -- REPLACE ID CODE BOX
OK -- REPLACE HYBRID VEHICLE CONTROL ECU 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 Programming and Relearning.
NEXT -- Continue to next step.
6. REGISTER ECU COMMUNICATION ID
(a) Register the ECU communication ID Programming and Relearning.
NEXT -- Continue to next step.
7. CHECK DTC OUTPUT
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs.
OK:
DTC B279A is not output.
NG -- REPLACE HYBRID VEHICLE CONTROL ECU Removal
OK -- END (ID CODE BOX WAS DEFECTIVE)