Engine Immobilizer System (w/ Smart Key System)

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

NOTICE:
If the certification ECU (smart key ECU assembly) is replaced, register the key and ECU communication ID Engine Immobilizer System (w/ Smart Key System).

PROCEDURE

1. CHECK DTC OUTPUT

(a) Delete the DTCs Engine Immobilizer 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 How To Proceed With Troubleshooting

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 .

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Delete the DTCs Engine Immobilizer System (w/ Smart Key System).

(b) Recheck for DTCs.

OK:

B2784 output does not recur.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (ENGINE SWITCH IS DEFECTIVE)