Toyota Venza: Short to GND in Immobiliser System Power Source Circuit (B278A)
DESCRIPTION
This DTC is stored when the engine switch power source supply line is open or shorted.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B278A |
Engine switch power source supply line is open or shorted. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the certification ECU (smart key ECU assembly) is replaced, register the key
(See page .gif)
).
PROCEDURE
|
1. |
CHECK DTC OUTPUT |
(a) Clear the DTCs (See page ).
(b) Recheck for DTCs (See page ).
OK:
DTC B278A is not output.
| OK | .gif) |
USE SIMULATION METHOD TO CHECK |
|
.gif)
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH) |
(a) Disconnect the certification ECU (smart key ECU assembly) connector.
|
(b) Disconnect the engine switch connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D25-28 (VC5) - D13-14 (VC5) |
Always |
Below 1 Ω |
|
D25-36 (AGND) - D13-8 (AGND) |
Always |
Below 1 Ω |
|
D25-28 (VC5) - Body ground |
Always |
10 kΩ or higher |
|
D25-36 (AGND) - Body ground |
Always |
10 kΩ or higher |
|
*1 |
Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly)) |
|
*2 |
Front view of wire harness connector (to Engine Switch) |
| 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 engine switch connector.
(c) Using an oscilloscope, check the waveform.
Waveform (Reference):
|
Item |
Content |
|---|---|
|
Tester Connection |
D25-28 (VC5) - D25-36 (AGND) |
|
Tool Setting |
2 V/DIV., 200 ms./DIV. |
|
Condition |
|
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 |
| A | |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| B | |
REPLACE ENGINE SWITCH |
| C | |
REPLACE ENGINE SWITCH |
Theft Deterrent System Communication Line High Fixation (B279A)
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.
...
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DESCRIPTION
This DTC is stored when one of the following occurs: 1) the ECM detects an error
in its own communication with the certification ECU (smart key ECU assembly); 2)
the ECM detects an er ...
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