B2798

ENGINE IMMOBILIZER: ENGINE IMMOBILIZER SYSTEM: B2796: No Communication in Immobilizer System

DTC B2796 - No Communication in Immobilizer System

DTC B2798 - Communication Malfunction No. 2

DESCRIPTION

When a key is inserted into the ignition key cylinder but no communication occurs between the key and transponder key ECU, DTC B2796 is output.
When a key is inserted into the ignition key cylinder but a communication error occurs between the key and transponder key ECU, DTC B2798 is output.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (IMMOBILIZER SYSTEM)
(a) Check the Date List for proper functioning of the engine immobilizer system.

Immobilizer:





OK:
Unset (ignition switch ON) appears on the screen.
OK -- CHECK WIRE HARNESS (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU)
NG -- Continue to next step.
2. CHECK KEY (OPERATION)
(a) Temporarily replace the key with a new or normally functioning one.
(b) Check that the engine starts.
OK:
Engine starts.
OK -- END (KEY IS DEFECTIVE)
NG -- Continue to next step.
3. CHECK WIRE HARNESS (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU)




(a) Disconnect the T12 amplifier connector.
(b) Disconnect the T13 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK TRANSPONDER KEY AMPLIFIER (OPERATION)
(a) Temporarily replace the transponder key amplifier with a new or normally functioning one Removal.
(b) Check that the engine starts.
OK:
Engine starts.
NG -- REPLACE TRANSPONDER KEY ECU
OK -- END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)