Engine Immobiliser System (w/o Smart Key System)

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): B2796: No Communication in Immobiliser System

DTC B2796 - No Communication in Immobiliser System

DTC B2798 - Communication Malfunction No. 2

DESCRIPTION

When a key is inserted into the key slot but no communication occurs between the key and transponder key ECU, DTC B2796 is output. When a key is inserted into the key slot but a communication error occurs between the key and transponder key ECU, DTC B2798 is output.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (ENGINE IMMOBILISER SYSTEM)
(a) Check the Data List for proper functioning of the engine immobiliser system.

Transponder Key ECU:





OK:
"UNSET" (power switch ON (IG)) appears on screen.
OK -- REPLACE TRANSPONDER KEY ECU
NG -- Continue to next step.

2. CHECK DOOR CONTROL TRANSMITTER (OPERATION)
(a) Temporarily replace the door control transmitter with a new or normally functioning one.
(b) Check that change the power switch can be turned ON (IG).
OK:
Power switch can be turned ON (ACC and IG) and hybrid control system can be started.
OK -- END (DOOR CONTROL TRANSMITTER IS DEFECTIVE)
NG -- Continue to next step.

3. READ VALUE USING TECHSTREAM (TRANSPONDER KEY COIL)
(a) Check the Data List for proper functioning of the transponder key coil.

Transponder Key ECU:





OK:
"NORMAL" (transponder key coil is normal) is appears on screen.
NG -- REPLACE KEY SLOT
OK -- Continue to next step.

4. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - KEY SLOT)




(a) Disconnect the T5 ECU connector.
(b) Disconnect the K3 key slot connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

5. CHECK KEY SLOT (OPERATION)
(a) Temporarily replace the key slot with a new or normally functioning one.
(b) Check that the power switch can be turned ON (ACC and IG) and the hybrid control system can be started.
OK:
Power switch can be turned ON (ACC and IG) and hybrid control system can be started.
NG -- REPLACE TRANSPONDER KEY ECU
OK -- END (KEY SLOT IS DEFECTIVE)