DTC B2799-86: Engine Immobilizer System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [01/2017 - ]: Procedure

1. Register the communication ID codes.

   Refer to REGISTRATION [01/2017 - 09/2018] , or refer to REGISTRATION [09/2018 - 04/2020] , or refer to REGISTRATION [04/2020 - 05/2023] , or refer to REGISTRATION [05/2023 - ]

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

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   P64-12 (IMO) - Body ground	Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery	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 length or shape is abnormal, or IMO terminal stuck at Hi (12 V)	C

Result: 

B 

See step  6

Result: 

C 

See step  8

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 Assembly)	*b	Waveform
   *c	Approximately 160 ms.	*d	Approximately 270 ms.

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   P64-11 (IMI) - Body ground	Within 3 seconds of hybrid control system start or within 3 seconds of power switch turned on (IG) after cable disconnected and reconnected to auxiliary battery	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to  REMOVAL [01/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

OK 

See step  4

1. Register the ECU communication ID codes.

   Refer to REGISTRATION [01/2017 - 09/2018] , or refer to REGISTRATION [09/2018 - 04/2020] , or refer to REGISTRATION [04/2020 - 05/2023] , or refer to REGISTRATION [05/2023 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Check that the hybrid control system starts.

   Result

   Result	Proceed to
   Hybrid control system was started	A
   Hybrid control system was not started	B

Result: 

A 

END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED) 

Result: 

B 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [01/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

1. Disconnect the hybrid vehicle control ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Hybrid Vehicle Control ECU Assembly)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   P64-12 (IMO) - Body ground	Power switch turned on (IG) 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

Result: 

B 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [01/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

A 

See step  7

1. Disconnect the P51 ID code box (immobilizer code ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P51-3 (EFII) - P64-12 (IMO)	Always	Below 1 Ω
   P51-3 (EFII) or P64-12 (IMO) - Other terminals and body ground	Always	10 kΩ or higher
   P51-4 (EFIO) - P64-11 (IMI)	Always	Below 1 Ω
   P51-4 (EFIO) or P64-11 (IMI) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to  REMOVAL [01/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the P51 ID code box (immobilizer code ECU) connector.
2. Disconnect the P64 hybrid vehicle control ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P51-3 (EFII) - P64-12 (IMO)	Always	Below 1 Ω
   P51-3 (EFII) or P64-12 (IMO) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [01/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR