DESCRIPTION
When the communication line (IMI - EFIO) between the ECM and certification ECU (smart key ECU assembly) is stuck high, the ECM stores this DTC.
DTC Code |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
---|---|---|---|
B279A12 |
The communication line (IMI - EFIO) between the ECM and certification ECU (smart key ECU assembly) is stuck high (1 trip detection logic*1). |
|
Turn the engine switch on (IG) and wait 6 seconds. |
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
---|---|
Engine cannot be started (initial ignition occurs and engine cranks, then ignition stops) |
Engine cannot be started |
DTC Code |
Data List and Active Test |
---|---|
B279A12 |
- |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
HINT:
When DTC B279A12 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
2. |
CHECK FOR DTC |
(a) Turn the engine switch on (IG) and wait 10 seconds.
(b) Check for DTCs (See page ).
Result
Result |
Proceed to |
---|---|
DTC or B279A12 is output |
A |
DTC or B279A12 and other DTCs are output |
B |
HINT:
If DTCs other than DTC B279A12 are output, troubleshoot those DTCs first.
B |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
3. |
CHECK CONNECTION OF CONNECTOR |
(a) Turn the engine switch off.
(b) Check that the connectors are properly connected to the ECM and certification ECU (smart key ECU assembly).
OK:
Connectors are properly connected.
NG |
CONNECT CONNECTORS PROPERLY |
|
4. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM) |
(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the E14 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
C27-6 (EFIO) - E14-8 (IMI) |
Always |
Below 1 Ω |
C27-6 (EFIO) or E14-8 (IMI) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Replace the certification ECU (smart key ECU assembly) with a new one (See page ).
|
6. |
REGISTER RECOGNITION CODES |
(a) Register the key (See page ).
|
7. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page ).
|
8. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
9. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
HINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
OK:
DTC B279A12 is not output.
OK |
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
NG |
REPLACE ECM |
Inspection
INSPECTION
PROCEDURE
1. INSPECT PROPELLER SHAFT WITH CENTER BEARING ASSEMBLY
(a) Using a dial indicator, check the propeller shaft runout.
Maximum runout:
0.6 mm (0.0236 in.)
If the shaft runout is greater than the maximum, replace the shaft.
2. INSPECT PROPELLER SHAFT
(a) Using a dial ...
Precaution
PRECAUTION
CAUTION:
The vehicle is equipped with SRS, which consists of a driver airbag,
front passenger airbag, side airbags and curtain shield airbags and knee
airbags. Failure to carry out service operations in the correct sequence
could cause the SRS to unexpectedly deploy ...
Parts Location
PARTS LOCATION
ILLUSTRATION
*A
for Hydraulic Brake Booster
*B
for Vacuum Brake Booster
*C
w/ Toyota Safety Sense P
-
-
*1
BRAKE BOOSTER ASSEMBLY (SKID CONTROL ECU)
...