B2798

ENGINE IMMOBILIZER: ENGINE IMMOBILIZER SYSTEM: B2796,B2798: No Communication in Immobilizer System

DTC B2796 - No Communication in Immobilizer System

DTC B2798 - Communication Malfunction No. 2

DESCRIPTION

These codes are stored in the memory when a key that does not have a transponder chip is inserted or if communication between the key and transponder key ECU is impossible.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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

Immobilizer (Transponder Key ECU Assembly)





OK:
On the Techstream screen, the item changes between UNSET and SET according to the chart above.
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
NG -- Continue to next step.
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.
OK -- RE-REGISTER OR REPLACE KEY
NG -- Continue to next step.
3. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Immobilizer / Data List.
(e) Read the Data List according to the display on the Techstream.

Immobilizer (Transponder Key ECU Assembly)





OK:
On the Techstream screen, the item displays Normal according to the chart above.
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
NG -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY AMPLIFIER)




(a) Disconnect the T9 ECU and T8 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.
5. INSPECT TRANSPONDER KEY ECU ASSEMBLY




(a) Reconnect the T9 ECU and T8 amplifier connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- Continue to next step.
6. CHECK TRANSPONDER KEY AMPLIFIER
(a) After replacing the transponder key amplifier with a normally functioning transponder key amplifier, check that the engine starts.
OK:
The engine starts.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END