B2798

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: B2796,B2798: No Communication in Immobiliser System

DTC B2796 - No Communication in Immobiliser System

DTC B2798 - Communication Malfunction No. 2

DESCRIPTION

These DTCs are output if a key that does not have a transponder chip is inserted into the ignition key cylinder or if communication between the key and transponder key ECU assembly is impossible.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- If the transponder key ECU assembly is replaced, register the key and ECU communication ID Engine Immobiliser System.
- If the key is replaced, register the key Engine Immobiliser System.

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Immobiliser / Data List.
(e) Read the Data List according to the display on the Techstream.

Immobiliser (Transponder Key ECU Assembly)





OK:
On the Techstream screen, the item changes between UNSET and SET according to the chart above.
NG -- CHECK KEYS
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
2. CHECK KEYS
(a) Insert the vehicle's other key into the ignition key cylinder.
(b) Check that the engine starts with this key.
OK:
The engine starts.
NG -- REPLACE TRANSPONDER KEY AMPLIFIER
OK -- Continue to next step.

3. RE-REGISTER KEY
(a) Re-register the key Engine Immobiliser System.
NEXT -- Continue to next step.

4. CHECK ENGINE START
(a) Check that the engine starts.
OK:
The engine starts.
NG -- REPLACE KEY
OK -- END (PROBLEM WITH KEY REGISTRATION)
5. REPLACE TRANSPONDER KEY AMPLIFIER
(a) Replace the transponder key amplifier Removal.
NEXT -- Continue to next step.

6. CHECK ENGINE START
(a) Check that the engine starts.
OK:
The engine starts.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)