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

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 and turn the Techstream main switch on.
(c) Select Immobiliser in the Data List and read the value displayed on the Techstream.

Immobiliser:





OK:
Unset (Ignition switch on) appears on the screen.
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 and turn the Techstream main switch on.
(c) Select Antenna Coil Status in the Data List and read the value displayed on the Techstream.

Immobiliser:





OK:
Normal (Antenna coil is normal) appears on the screen.
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 T8 ECU and I17 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 T8 ECU and I17 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 Removal, check that the engine starts.
OK:
The engine starts.

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