Engine Immobilizer System (w/o Smart Key System)
THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): B2799: Engine Immobiliser System Malfunction
B2799 - Engine Immobiliser System Malfunction
DESCRIPTION
This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communications with the transponder key ECU assembly; 2) the ECM detects errors in the communication lines; or 3) the ECU - ECM communication ID between the transponder key ECU assembly and ECM is different and an engine start is attempted. Before troubleshooting for this DTC, make sure no engine immobiliser DTCs are output. If output, troubleshoot the engine immobiliser DTCs first.
* *1: Only output while a malfunction is present.
* *2: for Automatic Transaxle
* *3: for manual Transaxle
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Related Data List and Active Test
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* The fixed 12 V power source voltage in the ECM is output through a resistance from terminal IMI. The transponder key ECU assembly grounds or does not ground this power source voltage accordingly.
* The fixed 12 V power source voltage in the transponder key ECU assembly is output through a resistance from terminal EFII. The ECM grounds or does not ground this power source voltage accordingly.
* When replacing the transponder key ECU assembly or ECM, refer to Registration Engine Immobilizer System (w/o Smart Key System).
* After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
PROCEDURE
1. CLEAR DTC
(a) Clear the DTCs Engine Immobilizer System (w/o Smart Key System).
NEXT -- Continue to next step.
2. CHECK FOR DTC
(a) Check for DTCs Engine Immobilizer System (w/o Smart Key System).
OK:
DTC B2799 is not output.
Result
C -- Go to DIAGNOSTIC TROUBLE CODE CHART Engine Immobilizer System (W/O Smart Key System)
B -- CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)
A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
3. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)
(a) Using an oscilloscope, check the waveform.
Measurement Condition
HINT
The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.
OK:
Waveform is output normally (refer to illustration).
Text in Illustration
Result
C -- CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
B -- CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)
A -- Continue to next step.
4. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)
(a) Using an oscilloscope, check the waveform.
Measurement Condition
HINT
The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.
OK:
Waveform is output normally (refer to illustration).
Text in Illustration
Result
B -- CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)
A -- Continue to next step.
5. REREGISTER ECU - ECM COMMUNICATION ID
(a) Reregister the ECU - ECM communication ID Engine Immobilizer System (w/o Smart Key System).
NEXT -- Continue to next step.
6. CHECK WHETHER ENGINE STARTS
(a) Check that the engine starts with an already registered vehicle key.
OK:
Engine starts normally.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END (COMMUNICATION ID REGISTRATION IS DEFECTIVE)
7. REPLACE TRANSPONDER KEY ECU ASSEMBLY
(a) Temporarily replace the transponder key ECU assembly with a new one Removal.
NEXT -- Continue to next step.
8. REGISTER ECU - ECM COMMUNICATION ID (ECU COMMUNICATION ID REGISTRATION)
(a) Register the ECU - ECM communication ID Engine Immobilizer System (w/o Smart Key System).
NEXT -- Continue to next step.
9. CHECK WHETHER ENGINE STARTS
(a) Check that the engine starts with the key.
OK:
Engine starts normally.
NG -- REPLACE ECM Removal
OK -- END (TRANSPONDER KEY ECU IS DEFECTIVE)
10. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)
(a) Disconnect A35 ECM connector.
(b) Using an oscilloscope, check the waveform.
Measurement Condition
HINT
The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.
OK:
Waveform is output normally (refer to illustration).
Text in Illustration
Result
B -- CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
A -- REPLACE ECM Removal
11. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
(a) Disconnect the C39 transponder key ECU assembly connector.
(b) Disconnect the A35 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal
12. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFII)
(a) Disconnect the A35 ECM connector.
(b) Using an oscilloscope, check the waveform.
Measurement Condition
HINT
The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.
OK:
Waveform is output normally (refer to illustration).
Text in Illustration
Result
B -- CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
A -- Continue to next step.
13. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
(a) Disconnect the C39 transponder key ECU assembly connector.
(b) Disconnect the A35 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal
14. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
(a) Disconnect the C39 transponder key ECU assembly connector.
(b) Disconnect the A35 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal