DTC B2799-86: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [11/2015 -]: Procedure

1. Register the communication ID codes.

   Refer to REGISTRATION [11/2015 - 12/2018] , or refer to REGISTRATION [12/2018 -]

   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 (Hybrid Vehicle Control ECU)	*b	Waveform
   *c	Approximately 160 ms.	*d	Approximately 270 ms.

   Measurement Condition

   (F3)

   (F3)

   Tester Connection	Condition	Tool Setting	Specified Condition
   F3-23 (IMO) - Body ground	Turn the power switch on (READY)	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   Result

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

Result: 

B 

See step  6

Result: 

C 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

Result: 

A 

See step  3

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Hybrid Vehicle Control ECU)	*b	Waveform
   *c	Approximately 160 ms.	*d	Approximately 270 ms.

   Measurement Condition

   (F3)

   (F3)

   Tester Connection	Condition	Tool Setting	Specified Condition
   F3-10 (IMI) - Body ground	Power switch turned on (IG) using registered electrical key transmitter sub-assembly	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ID CODE BOX (IMMOBILISER CODE ECU). Refer to  REMOVAL [11/2015 -] 

Result: 

OK 

See step  4

1. Register the ECU communication ID codes.

   Refer to REGISTRATION [11/2015 - 12/2018] , or refer to REGISTRATION [12/2018 -]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the power switch on (IG).
2. Check that the hybrid control system starts 5 seconds after the power switch turned on (IG).

   OK

   Hybrid control system starts normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED) 

Result: 

NG 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

1. Disconnect the F3 hybrid vehicle control ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   (F3)

   (F3)

   Tester Connection	Condition	Specified Condition
   F3-23 (IMO) - Body ground	Power switch turned on (IG) using registered electrical key transmitter sub-assembly	Terminal IMO stuck low (2.4 V or less)
   F3-23 (IMO) - Body ground	Power switch turned on (IG) using registered electrical key transmitter sub-assembly	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

Result: 

B 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

Result: 

A 

See step  7

1. Disconnect the F19 ID code box (immobiliser code ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   (F19, F3)

   (F19)

   (F3)

   Tester Connection	Condition	Specified Condition
   F19-3 (EFII) - F3-23 (IMO)	Always	Below 1 Ω
   F19-3 (EFII) or F3-23 (IMO) - Body ground	Always	10 kΩ or higher
   F19-4 (EFIO) - F3-10 (IMI)	Always	Below 1 Ω
   F19-4 (EFIO) or F3-10 (IMI) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

1. Replace the ID code box (immobiliser code ECU) with a new one.

   Refer to REMOVAL [11/2015 -]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  9

1. Register the ECU communication ID code.

   Refer to REGISTRATION [11/2015 - 12/2018] , or refer to REGISTRATION [12/2018 -]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  10

1. Check that the hybrid control system starts.

   OK

   Hybrid control system starts normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

Result: 

OK 

See step  11

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2015 -]

   Powertrain > Hybrid Control > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  12

1. Check for DTCs.

   Powertrain > Hybrid Control > Trouble Codes 

   HINT: 

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

   OK

   DTC B2799-86 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE) 

Result: 

NG 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 -]