B2784

ENGINE IMMOBILIZER SYSTEM: B2784: Antenna Coil Open / Short

DTC B2784 - Antenna Coil Open / Short

DESCRIPTION

The transponder key coil is built into the transponder key amplifier and receives a key code signal from the transponder chip in the key. This signal is amplified by the amplifier, and output to the transponder key ECU.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch on and turn the tester on.
(c) Select Antenna Coil Status in the Data List and read the value displayed on Techstream.

Immobilizer:





OK:
NORMAL (Antenna coil is normal) appears on the screen.
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY AMPLIFIER)





(a) Disconnect the T9 ECU and T8 switch connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT TRANSPONDER KEY ECU ASSEMBLY





(a) Reconnect the T9 ECU and T8 amplifier connectors.
(b) Measure the voltage according to the value(s) in the table below.
Voltage:





(c) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- Continue to next step.
4. CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER
(a) After replacing the transponder key amplifier with a normally functioning transponder key amplifier, check that the hybrid control system starts.
OK:
Hybrid control system starts.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END (TRANSPONDER KEY AMPLIFIER DEFECTIVE)