Dtc B2796 No Communication In Immobiliser System

Vehicle Interior. Corolla. Zre142 Aze141
Theft Deterrent Keyless Entry. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

CHECK KEY

RE-REGISTER KEY

CHECK ENGINE START

REPLACE TRANSPONDER KEY AMPLIFIER

CHECK ENGINE START

DTC B2796 No Communication in Immobiliser System

DTC B2798 Communication Malfunction No. 2


DESCRIPTION

These DTCs are output if a key that does not have a transponder chip is inserted into the ignition key cylinder or if communication between the key and the transponder key ECU assembly is impossible.

DTC No.
DTC Detection Condition
Trouble Area
B2796
The key code cannot be transmitted
  1. Key
  2. Transponder key amplifier
  3. Transponder key ECU assembly
B2798
Key code identification cannot be completed within the specified time (0.15 to 0.5 sec.)
  1. Key
  2. Transponder key amplifier
  3. Transponder key ECU assembly

WIRING DIAGRAM


Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B2796 No Communication In Immobiliser System


INSPECTION PROCEDURE

NOTICE:
  1. If the transponder key ECU assembly is replaced, register the key and ECU communication ID (COROLLA_ZRE142 RM00000120Y02CX.html).
  2. If the key is replaced, register the key (COROLLA_ZRE142 RM00000120Y02CX.html).
1.READ VALUE USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Body Electrical / Immobiliser / Data List.

  1. Read the Data List according to the display on the Techstream.

    Immobiliser (Transponder Key ECU Assembly)
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Immobiliser
    		Immobiliser system status/SET or UNSET
    		UNSET: Ignition switch ON
    SET: Without key
    		-
    OK:
    On the Techstream screen, the item changes between UNSET and SET according to the chart above.


NG
Go to step 2
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY (COROLLA_ZRE142 RM000003G05004X.html)

2.CHECK KEY

  1. Insert the vehicle's other key into the ignition key cylinder.

  1. Check that the engine starts with this key.

    OK:
    The engine starts.


NG
Go to step 5
OK


3.RE-REGISTER KEY

  1. Re-register the key (COROLLA_ZRE142 RM00000120Y02CX.html).


NEXT


4.CHECK ENGINE START

  1. Check that the engine starts.

    OK:
    The engine starts.


NG
REPLACE KEY
OK

END (KEY REGISTRATION IS DEFECTIVE)

5.REPLACE TRANSPONDER KEY AMPLIFIER

  1. Replace the transponder key amplifier (COROLLA_ZRE142 RM000003G0L004X.html).


NEXT


6.CHECK ENGINE START

  1. Check that the engine starts.

    OK:
    The engine starts.


NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY (COROLLA_ZRE142 RM000003G05004X.html)
OK

END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)