B2784
THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILIZER SYSTEM: B2784: Antenna Coil Open / Short
B2784 - Antenna Coil Open / Short
DESCRIPTION
When an open or short circuit is detected in the transponder key amplifier coil built into the engine switch, the certification ECU stores this DTC. This DTC is also stored as a past DTC.
* *: Only output while a malfunction is present.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Related Data List and Active Test
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Before replacing the certification ECU, refer to Registration Engine Immobilizer System.
* The certification ECU outputs a fixed 5 V power source voltage through a resistance from terminal CODE. The engine switch grounds or does not ground this power source voltage accordingly.
* The certification ECU outputs a fixed 5 V power source voltage through a resistance and transistor. The engine switch grounds or does not ground this signal accordingly.
* After performing repair, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
PROCEDURE
1. CLEAR DTC
(a) Clear the DTCs Engine Immobilizer System.
NEXT -- Continue to next step.
2. CHECK FOR DTC
(a) Perform the operation that fulfills the DTC output confirmation operation.
(b) Check for DTCs Engine Immobilizer System.
OK:
DTC B2784 is not output.
NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)
OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)
(a) Disconnect the G26 ECU connector.
(b) Disconnect the G24 switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. REPLACE ENGINE SWITCH
(a) Temporarily replace the engine switch with a new or normally functioning one Removal.
NEXT -- Continue to next step.
5. CLEAR DTC
(a) Clear the DTCs Engine Immobilizer System.
NEXT -- Continue to next step.
6. CHECK FOR DTC
(a) Perform the operation that fulfills the DTC output confirmation operation.
(b) Check for DTCs Engine Immobilizer System.
OK:
DTC B2784 is not output.
NG -- REPLACE CERTIFICATION ECU Removal
OK -- END (ENGINE SWITCH IS DEFECTIVE)