Engine Immobiliser System (w/o Smart Key System)
ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): B2784: Antenna Coil Open / Short
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 is then output to the transponder key ECU assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
If the transponder key ECU assembly is replaced, register the key and ECU communication ID Engine Immobiliser System (W/O Smart Key System).
PROCEDURE
1. READ VALUE USING TECHSTREAM (TRANSPONDER KEY AMPLIFIER)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the Techstream on.
(d) Select the following menu items: Body Electrical / Immobiliser / Data List.
(e) Select Antenna Coil Status in the Data List and read the tester display.
Immobiliser (Transponder Key ECU):
OK:
NORMAL (Antenna coil is normal) appears on the screen.
NG -- CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal
2. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)
(a) Disconnect the transponder key ECU assembly and transponder key amplifier connectors.
(b) 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.
3. REPLACE TRANSPONDER KEY AMPLIFIER
(a) Temporarily replace the engine switch with a new or normally functioning one Removal.
NEXT -- Continue to next step.
4. CLEAR DTC
(a) Delete the DTCs Engine Immobiliser System (w/o Smart Key System).
NEXT -- Continue to next step.
5. CHECK FOR DTC
(a) Recheck for DTCs Engine Immobiliser System (w/o Smart Key System).
OK:
DTC B2784 does not recur.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal
OK -- END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE))