DTC B2799: Engine Immobilizer System Malfunction [08/2015 - ]: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

NEXT: Go to next step 

1. Perform "DTC Output Confirmation Operation" procedure.
2. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   OK

   DTC B2799 is not output.

   Result

   Result	Proceed to
   DTC B2799 is output	A
   Other DTCs are output	B
   DTC B2799 is not output	C

B → See step   16 

C → See step   14 

A: Go to next step 

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (ECM)	*b	Waveform
   *c	Approximately 160 ms	*d	Approximately 270 ms

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   A25-29 (IMO) - Body ground	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	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   OK

   Waveform is similar to that shown in the illustration.

   Result

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

B → See step   7 

C → See step   11 

A: Go to next step 

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (ECM)	*b	Waveform
   *c	Approximately 160 ms	*d	Approximately 270 ms

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   A25-28 (IMI) - Body ground	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	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

   OK

   Waveform is similar to that shown in the illustration.

NG → See step   9 

OK: Go to next step 

1. Register the ECU communication ID. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Using a registered door control transmitter assembly, turn the ignition switch to ON.
2. Check that the engine starts 5 seconds after the ignition switch was turned to ON

   OK

   Engine starts normally.

NG → See step   11 

OK → END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE) 

1. Disconnect the A25 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A25-29 (IMO) - Body ground	Ignition switch turned to ON using registered door control transmitter assembly	Terminal IMO stuck low (2.4 V or less)

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to ECM)

   Result

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

B → See step   11 

A: Go to next step 

1. Disconnect the I19 transponder key ECU assembly connector.
2. Disconnect the A25 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I19-12 (EFII) - A25-29 (IMO)	Always	Below 1 Ω
   I19-12 (EFII) or A25-29 (IMO) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the transponder key ECU assembly with a new one. Refer to REMOVAL [08/2015 - ] .
   NOTE:

   Key ID code registration is necessary when replacing the transponder key ECU assembly, refer to Registration. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Using a registered door control transmitter assembly, turn the ignition switch to ON.
2. Check that the engine starts 5 seconds after the ignition switch was turned to ON

   OK

   Engine starts normally.

NG → See step   17 

OK → END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE) 

1. Temporarily replace the ECM with a new one. Refer to REMOVAL [08/2015 - ] .

NEXT: Go to next step 

1. Register the ECU communication ID. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

1. Using a registered door control transmitter assembly, turn the ignition switch to ON.
2. Check that the engine starts 5 seconds after the ignition switch was turned to ON

   OK

   Engine starts normally.

NG → See step   15 

OK → END (ECM WAS DEFECTIVE)