DESCRIPTION
If the communication line (EFIO-IMI) to the ID code box is stuck on HI output, the ECM stores this DTC.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B279A |
The communication line (EFIO-IMI) between the ECM and the ID code box is stuck on HI output. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
HINT:
If DTCs other than DTC B279A are output, troubleshoot those DTCs first.
Result
Result |
Proceed to |
---|---|
DTC B279A is not output |
A |
DTC B279A and other DTCs are output |
B |
DTC B279A is output |
C |
A |
USE SIMULATION METHOD TO CHECK |
B |
Go to DIAGNOSTIC TROUBLE CODE CHART |
|
3. |
CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM) |
(a) Disconnect the F72 box connector.
(b) Disconnect the F50 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F72-6 (EFIO) - F50-14 (IMI) |
Always |
Below 1 Ω |
F72-6 (EFIO) or F50-14 (IMI) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK ID CODE BOX (OUTPUT) |
(a) Using an oscilloscope, check the waveform.
Text in Illustration
*a |
Component with harness connected (ECM) |
- |
- |
Item |
Content |
---|---|
Tester Connection |
F50-14 (IMI) - Body ground |
Tool Setting |
10 V/DIV., 100 ms./DIV. |
Condition |
Engine switch on (IG) |
OK:
Waveform is output normally (refer to illustration).
OK |
REPLACE ECM |
|
5. |
CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND) |
(a) Disconnect the F72 box connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F72-1 (+B) - Body ground |
Always |
11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F72-8 (GND) - Body ground |
Always |
Below 1 Ω |
*a |
Front view of wire harness connector (to ID Code Box) |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
REPLACE ID CODE BOX |
(a) Replace the ID code box (See page ).
|
7. |
REGISTER RECOGNITION CODES |
(a) Register the recognition codes in the ECUs (See page ).
|
8. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page ).
|
9. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
10. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B279A is not output.
OK |
END (ID CODE BOX IS DEFECTIVE) |
NG |
REPLACE ECM |
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ON-VEHICLE INSPECTION
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