DTC B2799-86: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [12/2023 - ]: Procedure

1. Register the ECU communication ID code.

   Refer to REGISTRATION [12/2023 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (ID Code Box (Immobiliser Code ECU))	*b	Waveform
   *c	Approximately 160 ms.	*d	Approximately 270 ms.

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   E83-3 (EFII) - Body ground	Within 3 seconds of the engine start operation being performed or within 3 seconds of the ignition switch being turned to ON after connecting the cable to the negative (-) auxiliary battery terminal	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   Result

   Result	Proceed to
   Normal waveform	A
   Terminal EFII stuck low (2.4 V or less)	B
   Waveform not output, or has abnormal wavelength or shape, or terminal EFII stuck high (12 V)	C

Result: 

B 

See step  7

Result: 

C 

See step  9

Result: 

A 

See step  3

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (ID Code Box (Immobiliser Code ECU))	*b	Waveform
   *c	Approximately 160 ms.	*d	Approximately 270 ms.

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   E83-4 (EFIO) - Body ground	Within 3 seconds of the engine start operation being performed or within 3 seconds of the ignition switch being turned to ON after connecting the cable to the negative (-) auxiliary battery terminal	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  6

Result: 

OK 

See step  4

1. Register the ECU communication ID codes.

   Refer to REGISTRATION [12/2023 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

Pre-procedure1

1. Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the ignition switch to ON.

   Procedure1

2. Check that the engine can be started 5 seconds after the ignition switch turned to ON.

   OK

   Engine starts normally.

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. None

Result: 

OK 

END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED) 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [12/2023 - ] 

Pre-procedure1

1. Disconnect the E83 ID code box (immobiliser code ECU) connector.
2. Disconnect the A2 ECM connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E91-4 (EFIO) - A2-24 (IMI)	Always	Below 1 Ω
   E91-4 (EFIO) or A2-24 (IMI) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

OK 

REPLACE ID CODE BOX (IMMOBILISER CODE ECU). Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

1. Disconnect the A2 ECM connector.

   Procedure1

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A2-23 (IMO) - Body ground	Ignition switch turned to ON using registered electrical key transmitter sub-assembly	Terminal IMO stuck low (2.4 V or less)
   		Terminal IMO stuck high (12 V) or abnormal waveform

   Result

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

   Post-procedure1

3. None

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [12/2023 - ] 

Result: 

A 

See step  8

Pre-procedure1

1. Disconnect the E83 ID code box (immobiliser code ECU) connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E91-3 (EFII) - A2-23 (IMO)	Always	Below 1 Ω
   E91-3 (EFII) or A2-23 (IMO) - Other terminals and body ground	Always	10 kΩ or higher
   E91-4 (EFIO) - A2-24 (IMI)	Always	Below 1 Ω
   E91-4 (EFIO) or A2-24 (IMI) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. None

Result: 

OK 

REPLACE ID CODE BOX (IMMOBILISER CODE ECU). Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

1. Disconnect the E83 ID code box (immobiliser code ECU) connector.
2. Disconnect the A2 ECM connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E91-3 (EFII) - A2-23 (IMO)	Always	Below 1 Ω
   E91-3 (EFII) or A2-23 (IMO) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR