Toyota Tacoma (2015-2018) Service Manual: Theft Deterrent System Communication Line High Fixation (B279A,B279A12)
DESCRIPTION
If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high (e.g. shorted to +B), the ECM stores this DTC.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
|---|---|---|---|
|
B279A*1 |
Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high. |
|
Turn the ignition switch to ON and wait 6 seconds. |
|
B279A12*2 |
Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high. |
|
Turn the ignition switch to ON and wait 6 seconds. |
- *1: for 2TR-FE
- *2: for 2GR-FKS
|
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 No. |
Data List and Active Test |
|---|---|
|
B279A*1 |
- |
|
B279A12*1 |
- |
- *1: for 2TR-FE
- *2: for 2GR-FKS
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- If the transponder key ECU assembly or ECM is replaced, refer to Registration
(See page
.gif)
). - After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
.gif)
|
2. |
CHECK DTC OUTPUT |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
|
Result |
Proceed to |
|---|---|
|
DTC B279A (for 2TR-FE) or B279A12 (for 2GR-FKS) is output |
A |
|
DTC B279A (for 2TR-FE) or B279A12 (for 2GR-FKS) is not output |
B |
| B | .gif) |
USE SIMULATION METHOD TO CHECK |
|
|
3. |
CHECK CONNECTION OF CONNECTOR |
(a) Check that the connectors are properly connected to the ECM and transponder key ECU assembly.
OK:
Connectors are properly connected.
| NG | |
CONNECT CONNECTORS PROPERLY |
|
|
4. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM) |
(a) Disconnect the T10 transponder key ECU assembly connector.
(b) Disconnect the E14*1 or E20*2 ECM connector.
- *1: for 2GR-FKS
- *2: for 2TR-FE
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
T10-13 (EFIO) - E14-8 (IMI)*1 |
Always |
Below 1 Ω |
|
T10-13 (EFIO) or E14-8 (IMI) - Body ground*1 |
Always |
10 kΩ or higher |
|
T10-13 (EFIO) - E20-10 (IMI)*2 |
Always |
Below 1 Ω |
|
T10-13 (EFIO) or E20-10 (IMI) - Body ground*2 |
Always |
10 kΩ or higher |
- *1: for 2GR-FKS
- *2: for 2TR-FE
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
(a) Replace the transponder key ECU assembly with a new one (See page
).
|
|
6. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
|
7. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
|
Result |
Proceed to |
|---|---|
|
DTC B279A (for 2TR-FE) or B279A12 (for 2GR-FKS) is not output |
A |
|
DTC B279A is output (for 2TR-FE) |
B |
|
DTC B279A12 is output (for 2GR-FKS) |
C |
| A | |
END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE) |
| B | |
REPLACE ECM |
| C | |
REPLACE ECM |
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
HINT:
If a trouble code is stored during the DTC check, inspect the trouble areas listed
for that code. For details of the code, refer to "See page" below.
...
Theft Deterrent System Presence Detection (B279C,B279C95)
DESCRIPTION
If an ECM that is incompatible with the engine immobiliser system is installed,
the ECM stores this DTC.
DTC No.
DTC Detection Condition
Trouble Area
...
Other materials:
Theft Deterrent System is not Unset when Engine is Running
DESCRIPTION
The theft deterrent system is unset when the IG signal and engine speed signal
are input to the main body ECU (multiplex network body ECU) for 2 seconds or more
continuously.
The engine speed signal is sent from the ECM to the main body ECU (multiplex
network body ECU). For this ...
Engine Coolant Temperature Receiver Gauge Malfunction
DESCRIPTION
In this circuit, the meter CPU receives engine coolant temperature signals from
the ECM using the CAN communication system (CAN V1 Bus). The meter CPU displays
engine coolant temperature that is calculated based on the data received from the
ECM.
WIRING DIAGRAM
CAUTION / NOTIC ...
Rear Door Courtesy Switch
Inspection
INSPECTION
PROCEDURE
1. INSPECT REAR DOOR COURTESY SWITCH
(a) Check the resistance.
(1) Measure the resistance using an ohmmeter, and check the results in accordance
with the value( s) in the table below.
Standard:
Tester Connection
Condition
S ...
