B2796

ENGINE IMMOBILISER SYSTEM: B2796: No Communication in Immobiliser System

DTC B2796 - No Communication in Immobiliser System

DTC B2798 - Communication Malfunction No. 2

DESCRIPTION

These DTCs are output when 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 not possible.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Read the Data List according to the display on the tester.





OK:
"SET" (Ignition switch ON) appears on the screen.
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
NG -- Continue to next step.
2. CHECK KEYS
(a) Check if the engine starts with the vehicle's other keys.
OK:
The engine starts.
OK -- RE-REGISTER OR REPLACE KEY
NG -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)





(a) Disconnect the T10 ECU and T9 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.
4. CHECK TRANSPONDER KEY AMPLIFIER
(a) After replacing the transponder key amplifier with a normally functioning amplifier, check that the engine starts.
OK:
The engine starts.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END