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.
*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 |
Inspection
INSPECTION
PROCEDURE
1. INSPECT GENERATOR WITH CLUTCH PULLEY
(a) Hold the center of the generator with clutch pulley and check that the outer
ring turns counterclockwise and does not turn clockwise.
Text in Illustration
Free
...
Display does not Dim when Light Control Switch is Turned ON
PROCEDURE
1.
CHECK IMAGE QUALITY SETTING
(a) Turn the light control switch to the tail or head position.
(b) Check that the daytime screen setting on the display adjustment screen is
set to on.
Result
...