DESCRIPTION
When an open or short circuit is detected in the antenna coil built into the transponder key coil, the transponder key ECU assembly stores this DTC.
DTC No. |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
---|---|---|---|
B2784 |
The antenna coil in the transponder key coil is open/shorted. |
|
Insert the door control transmitter assembly into the ignition key cylinder, turn the ignition switch from off to ON and wait at least 20 seconds. |
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
---|---|
Engine cannot be started |
- |
DTC No. |
Data List and Active Test |
---|---|
B2784 |
Antenna Coil Status |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
2. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
OK:
DTC B2784 is not output.
Result
Result |
Proceed to |
---|---|
DTC B2784 is output |
A |
DTC B2784 is not output |
B |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
|
3. |
CHECK CONNECTION OF CONNECTOR |
(a) Check that the connector is properly connected to the transponder key coil.
|
4. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
5. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs. (See page ).
OK:
DTC B2784 is not output.
Result
Result |
Proceed to |
---|---|
DTC B2784 is not output |
A |
DTC B2784 is output |
B |
A | ![]() |
END (CONNECTOR WAS NOT CONNECTED PROPERLY) |
|
6. |
CHECK TRANSPONDER KEY COIL (OUTPUT) |
(a) Using an oscilloscope, check the waveform.
*a |
Component with harness connected (Transponder Key Coil) |
*b |
Waveform 1 |
*c |
Waveform 2 |
- |
- |
Measurement Condition:
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
---|---|---|---|
T9-1 (ANT1) - Body ground |
Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 1) |
T9-5 (ANT2) - Body ground |
Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 2) |
OK:
Waveform is similar to that shown in the illustration.
Result
Result |
Proceed to |
---|---|
NG |
A |
OK |
B |
B | ![]() |
REPLACE TRANSPONDER KEY COIL |
|
7. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL) |
(a) Disconnect the T10 transponder key ECU assembly connector.
(b) Disconnect the T9 transponder key coil connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
T10-4 (ANT1) - T9-1 (ANT1) |
Always |
Below 1 Ω |
T10-15 (ANT2) - T9-5 (ANT2) |
Always |
Below 1 Ω |
T10-4 (ANT1) or T9-1 (ANT1) - Body ground |
Always |
10 kΩ or higher |
T10-15 (ANT2) or T9-5 (ANT2) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
(a) Replace the transponder key ECU assembly with a new one (See page
).
NOTICE:
Key ID code registration is necessary when replacing the transponder key ECU
assembly, refer to Registration (See page ).
|
9. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
10. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
OK:
DTC B2784 is not output.
Result
Result |
Proceed to |
---|---|
DTC B2784 is not output |
A |
DTC B2784 is output |
B |
A | ![]() |
END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE) |
B | ![]() |
REPLACE TRANSPONDER KEY COIL |
Parts Location
PARTS LOCATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
...
Clutch Start Cancel Switch
Inspection
INSPECTION
PROCEDURE
1. INSPECT CLUTCH START CANCEL SWITCH ASSEMBLY
(a) Using an ohmmeter, check that there is resistance between terminals
2 and 4.
Standard:
10 kΩ or higher
If the result is not as specified, replace the clutch start cancel switch.
...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT REFRIGERANT PRESSURE
(a) This method uses a refrigerant recovery unit set to locate problem areas.
Read the refrigerant pressure when the test conditions are established.
Test conditions:
Temperature at the air inlet with the air recirculation ...