B2798

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2796: No Communication in Immobiliser System

DTC B2796 - No Communication in Immobiliser System

DTC B2798 - Communication Malfunction No. 2

DESCRIPTION

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

Immobiliser:





OK:
"SET" (Ignition switch ON) appears on the screen.

NG -- CHECK KEYS
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
2. CHECK KEYS
(a) Check if the engine starts with the vehicle's other keys.
OK:
Engine starts.

NG -- CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY AMPLIFIER)
OK -- RE-REGISTER OR REPLACE KEY
3. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY AMPLIFIER)





(a) Disconnect the D33 ECU and D32 amplifier connectors.
(b) Measure the resistance according to the value(s) in the table below.
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:
Engine starts.

NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END