DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CLEAR DTC
CHECK FOR DTC
CHECK CONNECTION OF CONNECTOR
CHECK WHETHER ENGINE STARTS
CLEAR DTC
CHECK FOR DTC
CHECK TRANSPONDER KEY AMPLIFIER
CHECK TRANSPONDER KEY AMPLIFIER (VC5)
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY)
CHECK TRANSPONDER KEY AMPLIFIER (TXCT)
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY)
CHECK TRANSPONDER KEY AMPLIFIER (CODE)
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY)
DTC B2796 No Communication in Immobiliser System
DESCRIPTION
DTC B2796 is stored when a key is inserted into the ignition key cylinder but no communication occurs between the key and transponder key ECU assembly.
| DTC Code | DTC Detection Condition | Trouble Area | DTC Output Confirmation Operation |
| B2796 | The key code cannot be transmitted (1 trip detection logic*). | Key
Harness or connector
Transponder key ECU assembly
Transponder key amplifier
| Insert the key into the ignition key cylinder. |
*: Only output while a malfunction is present.
Vehicle Condition and Fail-safe Operation when Malfunction Detected| Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
| Engine cannot be started | - |
Related Data List and Active Test| DTC Code | Data List and Active Test |
| B2796 | Response |
WIRING DIAGRAM
INSPECTION PROCEDURE
When replacing the transponder key ECU assembly or key, refer to the Service Bulletin.
After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
Insert and remove each registered key one at a time, and check for DTCs each time ().
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
If DTC B2796 is output, check for DTCs with the next key after clearing the DTCs.
- OK:
- DTC B2796 is not output.
Result| Result | Proceed to |
| OK | A |
| NG (all keys) | B |
| NG (any key) | C |
| |
|
| | REPLACE KEY THAT CANNOT START ENGINE |
|
|
| A | |
| |
| USE SIMULATION METHOD TO CHECK ()
|
|
| 3.CHECK CONNECTION OF CONNECTOR |
Check the connection of the transponder key ECU assembly and transponder key amplifier connectors.
Visually inspect the terminals of the transponder key ECU assembly and transponder key amplifier connectors.
- OK:
- Connectors are properly connected.
| | CONNECT CONNECTORS PROPERLY |
|
|
| 4.CHECK WHETHER ENGINE STARTS |
Check that the engine starts with an already registered vehicle key.
- OK:
- Engine starts normally.
Check for DTCs ().
- Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
- OK:
- DTC B2796 is not output.
| OK | |
| |
| END (CONNECTOR WAS NOT PROPERLY CONNECTED) |
|
| 7.CHECK TRANSPONDER KEY AMPLIFIER |
Using an oscilloscope, check the waveform.
Waveform 1 (Reference)
Measurement Condition| Item | Content |
| Tester Connection | E95-1 (VC5) - Body ground |
| Tool Setting | 1 V/DIV., 20 ms./DIV. |
| Condition | Key inserted in ignition key cylinder |
Waveform 2 (Reference)
Measurement Condition| Item | Content |
| Tester Connection | E95-5 (TXCT) - Body ground |
| Tool Setting | 1 V/DIV., 20 ms./DIV. |
| Condition | Key inserted in ignition key cylinder |
Waveform 3 (Reference)
Measurement Condition| Item | Content |
| Tester Connection | E95-4 (CODE) - Body ground |
| Tool Setting | 1 V/DIV., 20 ms./DIV. |
| Condition | Key inserted in ignition key cylinder |
- OK:
- Waveform is output normally (refer to illustration).
Text in Illustration| *a | Component with harness connected
(Transponder Key Amplifier) |
| *b | Waveform 1 |
| *c | Waveform 2 |
| *d | Waveform 3 |
Result| Result | Proceed to |
| OK | A |
| NG (Waveform 1) | B |
| NG (Waveform 2) | C |
| NG (Waveform 3) | D |
| A | |
| |
| REPLACE TRANSPONDER KEY ECU ASSEMBLY |
|
| 8.CHECK TRANSPONDER KEY AMPLIFIER (VC5) |
Disconnect the E95 transponder key amplifier connector.
Using an oscilloscope, check the waveform.
Waveform (Reference)
Measurement Condition| Item | Content |
| Tester Connection | E95-1 (VC5) - Body ground |
| Tool Setting | 1 V/DIV., 20 ms./DIV. |
| Condition | Key inserted in ignition key cylinder |
- OK:
- Waveform is output normally (refer to illustration).
Text in Illustration| *a | Front view of wire harness connector
(to Transponder Key Amplifier) |
| *b | Waveform |
| OK | |
| |
| REPLACE TRANSPONDER KEY AMPLIFIER ()
|
|
| 9.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY) |
Disconnect the E95 transponder key amplifier connector.
Disconnect the E96 transponder key ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E95-1 (VC5) - E96-14 (VC5) | Always | Below 1 Ω |
| E95-7 (AGND) - E96-5 (AGND) | Always | Below 1 Ω |
| E95-1 (VC5) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPLACE TRANSPONDER KEY ECU ASSEMBLY |
|
| 10.CHECK TRANSPONDER KEY AMPLIFIER (TXCT) |
Disconnect the E95 transponder key amplifier connector.
Using an oscilloscope, check the waveform.
Waveform (Reference)
Measurement Condition| Item | Content |
| Tester Connection | E95-5 (TXCT) - Body ground |
| Tool Setting | 1 V/DIV., 20 ms./DIV. |
| Condition | Key inserted in ignition key cylinder |
- OK:
- Waveform is output normally (refer to illustration).
Text in Illustration| *a | Front view of wire harness connector
(to Transponder Key Amplifier) |
| *b | Waveform |
| OK | |
| |
| REPLACE TRANSPONDER KEY AMPLIFIER ()
|
|
| 11.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY) |
Disconnect the E95 transponder key amplifier connector.
Disconnect the E96 transponder key ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E95-5 (TXCT) - E96-4 (TXCT) | Always | Below 1 Ω |
| E95-5 (TXCT) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPLACE TRANSPONDER KEY ECU ASSEMBLY |
|
| 12.CHECK TRANSPONDER KEY AMPLIFIER (CODE) |
Disconnect the E95 transponder key amplifier connector.
Using an oscilloscope, check the waveform.
Waveform (Reference)
Measurement Condition| Item | Content |
| Tester Connection | E95-4 (CODE) - Body ground |
| Tool Setting | 1 V/DIV., 20 ms./DIV. |
| Condition | Key inserted in ignition key cylinder |
- OK:
- Waveform is output normally (refer to illustration).
Text in Illustration| *a | Front view of wire harness connector
(to Transponder Key Amplifier) |
| *b | Waveform |
| OK | |
| |
| REPLACE TRANSPONDER KEY AMPLIFIER ()
|
|
| 13.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY AMPLIFIER - TRANSPONDER KEY ECU ASSEMBLY) |
Disconnect the E95 transponder key amplifier connector.
Disconnect the E96 transponder key ECU assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E95-4 (CODE) - E96-15 (CODE) | Always | Below 1 Ω |
| E95-4 (CODE) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| REPLACE TRANSPONDER KEY ECU ASSEMBLY |
|
