DESCRIPTION
This DTC is stored when a communication error occurs between the transponder key amplifier and transponder key ECU assembly. Some possible reasons for the communication error are: 1) 2 or more ignition keys are positioned too close together, or 2) noise is occurring in the communication line.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B2797 |
2 or more ignition keys are positioned too close to each other or noise occurs in the communication line. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When the transponder key ECU assembly is replaced, refer to Registration (See
page ).
PROCEDURE
1. |
CHECK KEY |
(a) Check whether the ignition key being used is near other ignition keys, as shown in the illustration. Also, check whether a key ring is in contact with the key grip. Result
|
|
B | ![]() |
GO TO STEP 3 |
|
2. |
CHECK FOR DTC |
(a) Separate the keys from each other or remove the key ring.
(b) Clear the DTCs (See page ).
(c) Insert a key into the ignition key cylinder, and then remove it. Repeat this for all the other keys.
(d) Check that no DTC is output (See page ).
OK:
DTC B2797 is not output.
OK | ![]() |
END |
|
3. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER) |
(a) Disconnect the F34 ECU connector.
(b) Disconnect the F17 amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F34-15 (CODE) - F17-4 (CODE) |
Always |
Below 1 Ω |
F34-15 (CODE) or F17-4 (CODE) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK TRANSPONDER KEY ECU ASSEMBLY (NOISE) |
(a) Using an oscilloscope, check for noise in the waveform between the terminals of the F17 amplifier connector and F34 ECU connector.
Item |
Content |
---|---|
Tester Connection |
F17-4 (CODE) - F34-15 (CODE) |
Tool Setting |
5 V/DIV., 20 ms./DIV. |
Condition |
Key inserted in ignition key cylinder |
OK:
No noise is present.
Text in Illustration
*a |
Component with harness connected (Transponder Key Amplifier) |
*b |
Component with harness connected (Transponder Key ECU Assembly) |
*c |
Noise should not appear |
NG | ![]() |
FIND CAUSE OF NOISE AND REMOVE IT |
|
5. |
REPLACE TRANSPONDER KEY AMPLIFIER |
(a) Temporarily replace the transponder key amplifier with a new or normally
functioning one (See page ).
|
6. |
CHECK WHETHER ENGINE STARTS |
(a) Check that the engine starts normally.
OK:
Engine starts.
OK | ![]() |
END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE) |
NG | ![]() |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
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 Code
DTC Detection Condition
Trouble Area
B278A
The engine switch power source supply line i ...
Side Auto Step ECU Power Source Circuit
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following
inspection procedure.
PROCEDURE
1.
CHECK HARNESS AND CONNECTOR (SIDE AUTO STEP CONTROLLER ECU - ...