B2798

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): B2796, B2798: No Communication in Immobiliser System
B2798 - Communication Malfunction No. 2

DESCRIPTION

* DTC B2796 is stored when a key is inserted into the ignition key cylinder but no communication occurs between the key and transponder key ECU assembly.

* DTC B2798 is stored when a key is inserted into the ignition key cylinder but a communication error occurs between the key and transponder key ECU assembly.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When the transponder key ECU assembly is replaced, refer to Registration Engine Immobilizer System (w/o Smart Key System).

PROCEDURE

1. CLEAR DTC

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

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTCs Engine Immobilizer System (w/o Smart Key System).

OK:

DTC B2796 or B2798 is not output.

NG -- READ VALUE USING TECHSTREAM (ENGINE IMMOBILISER SYSTEM)

OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

3. READ VALUE USING TECHSTREAM (ENGINE IMMOBILISER SYSTEM)

(a) Use the Data List to check if the engine immobiliser system is functioning properly Engine Immobilizer System (w/o Smart Key System).

Immobiliser





OK:

Set (the key is not inserted in the ignition key cylinder) and Unset (the key is inserted in the ignition key cylinder) appear on the screen according to the key insertion condition.

NG -- CHECK WHETHER ENGINE STARTS WITH OTHER KEYS

OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal

4. CHECK WHETHER ENGINE STARTS WITH OTHER KEYS

(a) Check if the engine starts with an already registered vehicle key.

OK:

Engine starts.

NG -- CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

OK -- REREGISTER KEY CODE OR REPLACE KEY THAT CANNOT START ENGINE

5. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

(a) Disconnect the F34 ECU connector.

(b) Disconnect the F17 amplifier 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.

6. REPLACE TRANSPONDER KEY AMPLIFIER

(a) Temporarily replace the transponder key amplifier with a new or normally functioning one Removal.

NEXT -- Continue to next step.

7. CHECK WHETHER ENGINE STARTS

(a) Check that the engine starts normally.

OK:

Engine starts normally.

NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal

OK -- END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)