Engine Immobiliser System (w/ Smart Key System)

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/ Smart Key System): B2784: Antenna Coil Open / Short

DTC B2784 - Antenna Coil Open / Short

DESCRIPTION

This DTC is output when there is an open or short in the key coil (built into the engine switch).






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: If the certification ECU (smart key ECU assembly) is replaced, register the key and ECU communication ID Engine Immobiliser System (W/ Smart Key System).

PROCEDURE

1. CHECK DTC OUTPUT
(a) Delete the DTCs Engine Immobiliser System (w/ Smart Key System).
(b) Recheck for DTCs.
OK:
B2784 output does not recur.
NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)
OK -- USE SIMULATION METHOD TO CHECK
2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)




(a) Disconnect the certification ECU (smart key ECU assembly) and engine switch 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 ENGINE SWITCH
(a) Replace the engine switch Removal.
NEXT -- Continue to next step.
4. CHECK DTC OUTPUT
(a) Delete the DTCs Engine Immobiliser System (w/ Smart Key System).
(b) Recheck for DTCs.
OK:
B2784 output does not recur.
NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
OK -- END (ENGINE SWITCH IS DEFECTIVE)