B2796

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2796,B2798: No Communication in Immobiliser System

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 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:

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 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:

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 T6 ECU and I14 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.

5. INSPECT TRANSPONDER KEY ECU ASSEMBLY

(a) Reconnect the T6 ECU and I14 amplifier connectors.





(b) Measure the voltage according to the value(s) in the table below.

Voltage:





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

Resistance:





NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- Continue to next step.

6. REPLACE 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 (TRANSPONDER KEY AMPLIFIER DEFECTIVE)