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 |
Operation Check
OPERATION CHECK
1. INSPECT DRIVER SIDE SEAT BELT WARNING LIGHT
(a) Turn the ignition switch to ON.
(b) When the driver seat belt is not fastened, check that the seat belt warning
light on the combination meter assembly blinks for 6 seconds. After 1.8 seco ...
Reassembly
REASSEMBLY
PROCEDURE
1. INSTALL FOG LIGHT ASSEMBLY LH
2. INSTALL FOG LIGHT ASSEMBLY RH
HINT:
Use the same procedure as for the LH side.
3. INSTALL FRONT BUMPER MOULDING SUB-ASSEMBLY
(a) Attach the 4 claws and 12 guides to install the front bumper mou ...