DESCRIPTION
If the communication line (EFIO - IMI) to the certification ECU (smart key ECU assembly) is stuck high output (e.g. shorted to +B), the ECM stores this DTC.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
B279A |
When the communication line (EFIO - IMI) between ECM and certification ECU (smart key ECU assembly) is stuck high output. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the certification ECU (smart key ECU assembly) is replaced, register the key (See page ).
PROCEDURE
1. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page ).
(b) Recheck for DTCs (See page ).
HINT:
If any DTCs other than DTC B279A are output, troubleshoot those DTCs first.
Result |
Proceed to |
---|---|
DTC B279A is output |
A |
DTC B279A and other DTCs are output |
B |
B |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ECM) |
(a) Disconnect the certification ECU (smart key ECU assembly) connector.
(b) Disconnect the ECM connector. |
|
(c) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
for 2GR-FE
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D25-35 (EFIO) - A41-40 (IMI) |
Always |
Below 1 Ω |
D25-35 (EFIO) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D25-35 (EFIO) - A49-11 (IMI) |
Always |
Below 1 Ω |
D25-35 (EFIO) - Body ground |
Always |
10 kΩ or higher |
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D25-35 (EFIO) - Body ground |
Always |
Below 1 V |
*1 |
Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly)) |
*2 |
Front view of wire harness connector (to ECM) |
*3 |
for 2GR-FE |
*4 |
for 1AR-FE |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Reconnect the certification ECU (smart key ECU assembly) connector.
(b) Reconnect the ECM connector.
(c) Using an oscilloscope, check the waveform.
Waveform (Reference):
Item |
Content |
---|---|
Terminal No. (Symbol) |
D25-35 (EFIO) - D25-15 (E) |
Tool Setting |
5 V/DIV., 100 msec./DIV. |
Condition |
Engine switch on (IG) |
OK:
Waveform is output normally (see illustration).
Result |
Proceed to |
---|---|
NG |
A |
OK (for 2GR-FE) |
B |
OK (for 1AR-FE) |
C |
*1 |
Component with harness connected (Certification ECU (Smart Key ECU Assembly)) |
*2 |
GND |
B |
REPLACE ECM |
C |
REPLACE ECM |
|
4. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Replace the certification ECU (smart key ECU assembly) (See page ).
|
5. |
KEY REGISTRATION |
(a) Register the key (See page ).
|
6. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page ).
|
7. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page ).
(b) Recheck for DTCs (See page ).
OK:
DTC B279A is not output.
Result |
Proceed to |
---|---|
OK |
A |
NG (for 2GR-FE) |
B |
NG (for 1AR-FE) |
C |
A |
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
B |
REPLACE ECM |
C |
REPLACE ECM |
Yaw Rate Sensor Output Malfunction (C1448/98)
DESCRIPTION
The skid control ECU receives signals from the yaw rate and acceleration sensor
via the CAN communication system.
The yaw rate sensor has a built-in acceleration sensor and detects the vehicle
condition.
DTC Code
DTC De ...
Off-road driving
Your vehicle is not designed to be driven off-road. However, in the event that
off-road driving cannot be avoided, please observe the following precautions to
help avoid the areas prohibited to vehicles.
• Drive your vehicle only in areas where off-road ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT CENTER AIRBAG SENSOR ASSEMBLY (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See page
).
2. INSPECT CENTER AIRBAG SENSOR ASSEMBLY (VEHICLE INVOLVED IN COLLISION AND AIRBAG
HAS NOT D ...