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DTC B2799 Engine Immobiliser System Malfunction: Description

The document provides troubleshooting steps for a DTC B2799 error related to the engine immobilizer system. It describes the error as occurring due to communication issues between the transponder key ECU and ECM. The inspection procedure involves re-registering the ECU communication ID, checking the wiring harness and connectors, and replacing components if needed.

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Teddy Khant
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9K views2 pages

DTC B2799 Engine Immobiliser System Malfunction: Description

The document provides troubleshooting steps for a DTC B2799 error related to the engine immobilizer system. It describes the error as occurring due to communication issues between the transponder key ECU and ECM. The inspection procedure involves re-registering the ECU communication ID, checking the wiring harness and connectors, and replacing components if needed.

Uploaded by

Teddy Khant
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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EI–36 ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM

DTC B2799 Engine Immobiliser System Malfunction


DESCRIPTION
This DTC is output when the ECM detects errors in communication between the transponder key ECU
and the ECM, or in the communication lines. This DTC is also output when an engine start is attempted
while the ECU communication ID between the transponder key ECU and the ECM are different. Before
troubleshooting for this DTC, make sure that there is no DTC detected in the transponder key ECU. If
there is key code-related DTC detected in the transponder key ECU, repair it first.
DTC No. DTC Detection Condition Trouble Area
• Error in communication between ECM and
• Wire harness
transponder key ECU, and in communication line
B2799 • Transponder key ECU assembly
• Communication ID is different during communication
• ECM
with transponder key ECU

WIRING DIAGRAM

T8
Transponder Key
ECU Assembly

ECM

16
W-R 6
IMI E7 EFIO

15
LR 7
IMO E7 EFII

B118496E08

EI INSPECTION PROCEDURE

1 RE-REGISTER ECU COMMUNICATION ID

(a) Re-register the ECU communication ID (See page EI-3)


between the transponder key ECU assembly and ECM.
(b) Check that the engine starts.
OK:
The engine starts.
OK END

NG
ENGINE IMMOBILISER – ENGINE IMMOBILISER SYSTEM EI–37

2 CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)

(a) Disconnect the T8 ECU and E7 ECM connectors.


Wire Harness Side Connector Front View: (b) Check the resistance of the wire harness side
connectors.
Transponder Key ECU Assembly Standard resistance
Tester Connection Specified Condition
T8-6 (EFIO) - E7-16 (IMI)
T8 Below 1 Ω
T8-7 (EFII) - E7-15 (IMO)
T8-6 (EFIO) - Body ground
10 kΩ or higher
T8-7 (EFII) - Body ground
EFIO EFII
NG REPAIR OR REPLACE HARNESS OR
ECM CONNECTOR

E7

IMO IMI B066229E10

OK

3 CHECK TRANSPONDER KEY ECU ASSEMBLY

(a) After replacing the transponder key ECU assembly with


a normally functioning transponder key ECU assembly,
check that the engine starts.
OK:
The engine starts.
NG REPLACE ECM

OK
EI
END

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