DESCRIPTION When an open or
short circuit is detected in the transponder key amplifier coil built
into the engine switch, the certification ECU (smart key ECU assembly)
stores this DTC. This DTC is also stored as a history DTC. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | B2784 |
Antenna Coil Open / Short |
The
transponder key amplifier coil built into the engine switch is open
(see below) or shorted (determined by communication with certification
ECU (smart key ECU assembly)). (1 trip detection logic*) |
- Engine switch
- Certification ECU (smart key ECU assembly)
- Wire harness or connector
| DTC output confirmation operation:
- With the shift lever in P and the electrical key transmitter
sub-assembly held near the engine switch, an engine start operation is
performed by pressing and holding the engine switch when the transmitter
battery is depleted.
|
- *: Only output while a malfunction is present.
Vehicle Condition and Fail-safe Operation when Malfunction Detected |
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected | |
Engine
cannot be started when transmitter battery is depleted by holding
electrical key transmitter sub-assembly near engine switch and pressing
and holding engine switch with shift lever in P |
- | Related Data List and Active Test |
DTC No. | Data List and Active Test | |
B2784 | - | WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the engine switch off, connect the
Techstream to the DLC3 and turn a courtesy light switch on and off at
intervals of 1.5 seconds or less until communication between the
Techstream and the vehicle begins. Then select the vehicle type under
manual mode and enter the following menus: Body Electrical / Smart Key.
While using the Techstream, periodically turn a courtesy light switch on
and off at intervals of 1.5 seconds or less to maintain communication
between the Techstream and the vehicle.
- The smart key system (for Start Function, Gasoline Model) uses the LIN
communication system and CAN communication system. Inspect the
communication function by following How to Proceed with Troubleshooting.
Troubleshoot the smart key system (for Start Function, Gasoline Model)
after confirming that the communication systems are functioning
properly.
Click here 
- Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here
- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE (a) Clear the DTCs. Body Electrical > Smart Key > Clear DTCs
|
NEXT |
 | |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs. Body Electrical > Smart Key > Trouble Codes OK:
DTC B2784 is not output.
| OK |  |
USE SIMULATION METHOD TO CHECK |
|
NG | |
| |
| 3. |
CHECK ENGINE SWITCH (OUTPUT) | (a) Using an oscilloscope, check the waveform.
|
*a | Component with harness connected
(Engine Switch) | *b |
Waveform | | *c |
Waveform (detail) | - |
- | OK: |
Tester Connection | Condition |
Tool Setting | Specified Condition | |
G41-8 (CODE) - G41-6 (AGND) |
Engine switch off, engine switch pressed with electrical key transmitter sub-assembly held near engine switch* |
1 V/DIV., 20 ms./DIV. |
Pulse generation (See waveform) | |
2 V/DIV., 100 μs./DIV. |
Pulse generation (See waveform (detail)) |
- *: Remove the transmitter battery before performing this inspection.
OK: The waveform is similar to that shown in the illustration
| OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| REPLACE ENGINE SWITCH | |
