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 past DTC.
DTC Code |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
---|---|---|---|
B2784 |
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*).
|
|
With the shift lever in P, the key held near the engine switch and an engine start operation is performed by pressing and holding the engine switch when the key battery is depleted. |
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
---|---|
Engine cannot be started when key battery is depleted by holding key near engine switch and pressing and holding engine switch with shift lever in P |
- |
DTC Code |
Data List and Active Test |
---|---|
B2784 |
- |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
2. |
CHECK DTC OUTPUT |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
OK:
DTC B2784 is not output.
OK |
USE SIMULATION METHOD TO CHECK |
|
3. |
CHECK ENGINE SWITCH (OUTPUT) |
(a) Using an oscilloscope, check the waveform.
Text in Illustration
*a |
Component with harness connected (Engine Switch) |
*b |
Waveform |
*c |
Waveform (detail) |
- |
- |
Measurement Condition:
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
---|---|---|---|
E28-8 (CODE) - E28-6 (AGND) |
Engine switch off, engine switch pressed with key 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)) |
OK:
The waveform is similar to that shown in the illustration
NG |
REPLACE ENGINE SWITCH |
|
4. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Replace the certification ECU (smart key ECU assembly) with a new one (See page ).
|
5. |
REGISTER RECOGNITION CODE |
(a) Register the key (See page ).
|
6. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page ).
|
7. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
8. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
OK:
DTC B2784 is not output.
OK |
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
NG |
REPLACE ENGINE SWITCH |
Terminals Of Ecu
TERMINALS OF ECU
CHECK ECM
HINT:
The standard voltage, resistance and waveform between each pair of the ECM terminals
is shown in the table below. The appropriate conditions for checking each pair of
the terminals is also indicated. The result of checks should be compared with the
standar ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (for Vehicle not Involved
in Collision)
(a) Perform a diagnostic system check (See page
).
(b) With the lower No. 1 instrument panel airbag assembly ...
Open Circuit in IG1/IG2 Power Source Circuit (C1242)
DESCRIPTION
If there is a problem with the skid control ECU (master cylinder solenoid) power
supply circuit, the skid control ECU outputs the DTC and prohibits operation under
the fail safe function.
If the voltage supplied to terminal IG1 and/or IG2 is not within the DTC detection
threshold ...