B2798

ENGINE IMMOBILIZER SYSTEM: B2796: 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 OF TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch on and turn the tester on.
(c) Select Immobilizer in the Data List and read the value displayed on Techstream.

Immobilizer:





OK:
Both UNSET (Ignition switch on) and SET (Without key) appear on the screen.
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
NG -- Continue to next step.
2. CHECK WHETHER HYBRID CONTROL SYSTEM STARTS WITH OTHER KEYS
(a) Insert the vehicle's other key into the ignition key cylinder.
(b) Check that the hybrid control system starts with this key.
OK:
Hybrid control system starts
OK -- RE-REGISTER OR REPLACE KEY
NG -- Continue to next step.
3. READ VALUE OF TECHSTREAM
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch on and turn the tester on.
(c) Select Antenna Coil Status in the Data List and read the value displayed on Techstream.

Immobilizer:





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 T9 ECU and T8 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 T9 ECU and T8 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. CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER
(a) After replacing the transponder key amplifier with a normally functioning transponder key amplifier, check that the hybrid control system starts.
OK:
Hybrid control system starts.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END (TRANSPONDER KEY AMPLIFIER DEFECTIVE)