B2799

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DTC Code	DTC Name
B2799	Engine Immobiliser System Malfunction

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DESCRIPTION

The ECM stores this DTC when a communication line between the ECM and transponder key ECU assembly is malfunctioning or the communication ID of the ECM and transponder key ECU assembly do not match.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B2799	Engine Immobiliser System Malfunction	One of the following conditions is met: Error in communication between ECM and transponder key ECU assembly. Error in communication lines. Communication ID is different during communication between ECM and transponder key ECU assembly.	Harness or connector Transponder key ECU assembly ECM	DTC Output Confirmation Operation: Start the engine and wait 10 seconds. After disconnecting and reconnecting the cable to the negative (-) battery terminal, turn the ignition switch to ON and wait 10 seconds.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2799

Engine Immobiliser System Malfunction

One of the following conditions is met:

Error in communication between ECM and transponder key ECU assembly.
Error in communication lines.
Communication ID is different during communication between ECM and transponder key ECU assembly.

Harness or connector
Transponder key ECU assembly
ECM

DTC Output Confirmation Operation:
Start the engine and wait 10 seconds.
After disconnecting and reconnecting the cable to the negative (-) battery terminal, turn the ignition switch to ON and wait 10 seconds.

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected	Fail-safe Operation when Malfunction Detected
Engine cannot be started	-

Table 2. Related Data List and Active Test
DTC No.	Data List and Active Test
B2799	-

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

If the transponder key ECU assembly or ECM is replaced, refer to Service Bulletin.
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

Tip:

If transponder key ECU assembly DTCs are output simultaneously, troubleshoot the transponder key ECU assembly DTCs first.

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PROCEDURE

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CLEAR DTC

Clear the DTCs.

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Powertrain > Engine > Clear DTCs

Result

Proceed to
NEXT

NEXTClick here

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CHECK FOR DTC

Start the engine.

Check for DTCs.

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Powertrain > Engine > Trouble Codes

Tip:

Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

OK
B2799 is not output.

Result

Result	Proceed to
OK	A
NG (B2799 is output)	B
NG (Other DTCs are output)	C

A
USE SIMULATION METHOD TO CHECKClick here
BClick here
C
GO TO DIAGNOSTIC TROUBLE CODE CHARTClick here

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INSPECT ECM (TERMINAL IMO)

*A	for 2TR-FE (for Automatic Transmission)	*B	for 1TR-FE, 2TR-FE (for Manual Transmission)
*C	for 1KD-FTV, 2KD-FTV	*D	for 1GD-FTV, 2GD-FTV
*E	for 1GR-FE	-	-
*a	Component with harness connected (ECM)	*b	Waveform

Using an oscilloscope, check the waveform.

Table 3. Measurement Condition
Item	Content
Tester Connection	G45-9 (IMO) - Body ground1 G83-29 (IMO) - Body ground2 G86-17 (IMO) - Body ground3 G88-8 (IMO) - Body ground4
Tool Setting	2 V/DIV., 500 ms./DIV.
Condition	Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

*1: for 1TR-FE, 2TR-FE
*2: for 1KD-FTV, 2KD-FTV
*3: for 1GD-FTV, 2GD-FTV
*4: for 1GR-FE

OK
Waveform is similar to that shown in the illustration.

Result

Result	Proceed to
OK	A
NG (Terminal IMO stuck low (2.4 V or less))	B
NG (Terminal IMO stuck high (12 V) or abnormal waveform)	C

AClick here
BClick here
CClick here
GO TO STEP 7

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INSPECT ECM (TERMINAL IMI)

*A	for 2TR-FE (for Automatic Transmission)	*B	for 1TR-FE, 2TR-FE (for Manual Transmission)
*C	for 1KD-FTV, 2KD-FTV	*D	for 1GD-FTV, 2GD-FTV
*E	for 1GR-FE	-	-
*a	Component with harness connected (ECM)	*b	Waveform

Using an oscilloscope, check the waveform.

Table 4. Measurement Condition
Item	Content
Tester Connection	G45-10 (IMI) - Body ground1 G83-30 (IMI) - Body ground2 G86-16 (IMI) - Body ground3 G88-10 (IMI) - Body ground4
Tool Setting	2 V/DIV., 500 ms./DIV.
Condition	Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

*1: for 1TR-FE, 2TR-FE
*2: for 1KD-FTV, 2KD-FTV
*3: for 1GD-FTV, 2GD-FTV
*4: for 1GR-FE

OK
Waveform is similar to that shown in the illustration.

Result

Proceed to
OK
NG

OKClick here
NGClick here
GO TO STEP 12

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Reregister the ECU communication ID.

Tip:

Refer to Service Bulletin.

Result

Proceed to
NEXT

NEXTClick here

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CHECK WHETHER ENGINE STARTS

Using a registered key, turn the ignition switch to ON.

Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK
Engine starts normally.

Result

Proceed to
OK
NG

OK
END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)
NGClick here

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REPLACE ECM

Temporarily replace the ECM with a new one.

for 1TR-FE:

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for 2TR-FE:

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for 1KD-FTV:

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for 2KD-FTV:

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for 1GD-FTV:

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for 2GD-FTV:

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for 1GR-FE:

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Result

Proceed to
NEXT

NEXTClick here

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Reregister the ECU communication ID.

Tip:

Refer to Service Bulletin.

Result

Proceed to
NEXT

NEXTClick here

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CHECK WHETHER ENGINE STARTS

Using a registered key, turn the ignition switch to ON.

Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK
Engine starts normally.

Result

Proceed to
OK
NG

OK
END (ECM WAS DEFECTIVE)
NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY

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INSPECT ECM (IMO TERMINAL VOLTAGE)

Disconnect the ECM connector.
Turn the ignition switch to ON.

for 1TR-FE, 2TR-FE

for 1KD-FTV, 2KD-FTV

for 1GD-FTV, 2GD-FTV

for 1GR-FE

Front view of wire harness connector

(to ECM)

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection

Condition

Result

G45-9 (IMO) - Body ground*1

G83-29 (IMO) - Body ground*2

G86-17 (IMO) - Body ground*3

G88-8 (IMO) - Body ground*4

Ignition switch turned to ON using registered key

Terminal IMO stuck low (2.4 V or less)

Terminal IMO stuck high (12 V) or abnormal waveform

*1: for 1TR-FE, 2TR-FE
*2: for 1KD-FTV, 2KD-FTV
*3: for 1GD-FTV, 2GD-FTV
*4: for 1GR-FE

Result

Result	Proceed to
Terminal IMO stuck low (2.4 V or less)	A
Terminal IMO stuck high (12 V) or Abnormal waveform	B

AClick here
BClick here
GO TO STEP 7

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CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM AND BODY GROUND)

Disconnect the G16 transponder key ECU assembly connector.
Disconnect the G45*1, G83*2, G86*3 or G88*4 ECM connector.
- *1: for 1TR-FE, 2TR-FE
- *2: for 1KD-FTV, 2KD-FTV
- *3: for 1GD-FTV, 2GD-FTV
- *4: for 1GR-FE

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Table 5. for 1TR-FE, 2TR-FE
Tester Connection	Condition	Specified Condition
G16-12 (EFII) - G45-9 (IMO)	Always	Below 1 Ω
G16-13 (EFIO) - G45-10 (IMI)	Always	Below 1 Ω
G45-9 (IMO) - Body ground	Always	10 kΩ or higher
G16-12 (EFII) - Body ground	Always	10 kΩ or higher
G45-10 (IMI) - Body ground	Always	10 kΩ or higher
G16-13 (EFIO) - Body ground	Always	10 kΩ or higher

Table 6. for 1KD-FTV, 2KD-FTV
Tester Connection	Condition	Specified Condition
G16-12 (EFII) - G83-29 (IMO)	Always	Below 1 Ω
G16-13 (EFIO) - G83-30 (IMI)	Always	Below 1 Ω
G83-29 (IMO) - Body ground	Always	10 kΩ or higher
G16-12 (EFII) - Body ground	Always	10 kΩ or higher
G83-30 (IMI) - Body ground	Always	10 kΩ or higher
G16-13 (EFIO) - Body ground	Always	10 kΩ or higher

Table 7. for 1GD-FTV, 2GD-FTV
Tester Connection	Condition	Specified Condition
G16-12 (EFII) - G86-17 (IMO)	Always	Below 1 Ω
G16-13 (EFIO) - G86-16 (IMI)	Always	Below 1 Ω
G86-17 (IMO) - Body ground	Always	10 kΩ or higher
G16-12 (EFII) - Body ground	Always	10 kΩ or higher
G86-16 (IMI) - Body ground	Always	10 kΩ or higher
G16-13 (EFIO) - Body ground	Always	10 kΩ or higher

Table 8. for 1GR-FE
Tester Connection	Condition	Specified Condition
G16-12 (EFII) - G88-8 (IMO)	Always	Below 1 Ω
G16-13 (EFIO) - G88-10 (IMI)	Always	Below 1 Ω
G88-8 (IMO) - Body ground	Always	10 kΩ or higher
G16-12 (EFII) - Body ground	Always	10 kΩ or higher
G88-10 (IMI) - Body ground	Always	10 kΩ or higher
G16-13 (EFIO) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

OKClick here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

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REPLACE TRANSPONDER KEY ECU ASSEMBLY

Replace the transponder key ECU assembly with a new one.

Tip:

Refer to Service Bulletin.

Result

Proceed to
NEXT

NEXTClick here

Click here

Tip:

Refer to Service Bulletin.

Result

Proceed to
NEXT

NEXTClick here

Click here

Tip:

Refer to Service Bulletin.

Result

Proceed to
NEXT

NEXTClick here

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CHECK WHETHER ENGINE STARTS

Using a registered key, turn the ignition switch to ON.

Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK
Engine starts normally.

Result

Proceed to
OK
NG (for 1TR-FE)
NG (for 2TR-FE)
NG (for 1KD-FTV)
NG (for 2KD-FTV)
NG (for 1GD-FTV)
NG (for 2GD-FTV)
NG (for 1GR-FE)

OK
END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)
NG (for 1TR-FE)
REPLACE ECMClick here
NG (for 2TR-FE)
REPLACE ECMClick here
NG (for 1KD-FTV)
REPLACE ECMClick here
NG (for 2KD-FTV)
REPLACE ECMClick here
NG (for 1GD-FTV)
REPLACE ECMClick here
NG (for 2GD-FTV)
REPLACE ECMClick here
NG (for 1GR-FE)
REPLACE ECMClick here

IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B2799