DTC B2799: Engine Immobilizer System Malfunction [10/2014 - ]: Procedure

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

Result: 

NEXT 

See step  2

1. Start the engine.
2. Wait 10 seconds or more.
3. Check for DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

   HINT: 

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

   OK

   DTC B2799 is not output.

   RESULT
   
   

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

Result: 

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

Result: 

C 

GO TO DIAGNOSTIC TROUBLE CODE CHART 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2014 - ] )

Result: 

B 

See step  3

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component with harness connected (ECM)

   *b

   Waveform

   MEASUREMENT CONDITION
   
   

   Item	Content
   Tester Connection	A18-30 (IMO) - B10-49 (E1)
   Tool Setting	2 V/DIV., 500 ms./DIV.
   Condition	Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

   OK

   Waveform is output normally (refer to 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

Result: 

B 

See step  7

Result: 

C 

See step  12

Result: 

A 

See step  4

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component with harness connected (ECM)

   *b

   Waveform

   MEASUREMENT CONDITION
   
   

   Item	Content
   Tester Connection	A18-31 (IMI) - B10-49 (E1)
   Tool Setting	2 V/DIV., 500 ms./DIV.
   Condition	Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

   OK

   Waveform is output normally (refer to illustration).

   RESULT
   
   

   Result	Proceed to
   Normal waveform	A
   Not output waveform or abnormal waveform	B

Result: 

B 

See step  9

Result: 

A 

See step  5

1. Reregister the ECU communication ID (Refer to REGISTRATION [10/2014 - ] ).

Result: 

NEXT 

See step  6

1. Check that the engine starts with an already registered vehicle key.

   OK

   Engine starts normally.

Result: 

OK 

END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE) 

Result: 

NG 

See step  12

1. Disconnect the A18 ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Result

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

   TEXT IN ILLUSTRATION
   
   

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

Result: 

B 

See step  12

Result: 

A 

See step  8

1. Disconnect the A28 certification ECU (smart key ECU assembly) connector.
2. Disconnect the A18 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A28-14 (EFII) - A18-30 (IMO)	Always	Below 1 Ω
   A28-14 (EFII) or A18-30 (IMO) - Body ground	Always	10 kΩ or higher
   A28-13 (EFIO) - A18-31 (IMI)	Always	Below 1 Ω
   A28-13 (EFIO) or A18-31 (IMI) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one (Refer to REGISTRATION [10/2014 - ] ).

Result: 

NEXT 

See step  10

1. Reregister the ECU communication ID (Refer to REGISTRATION [10/2014 - ] ).

Result: 

NEXT 

See step  11

1. Check that the engine starts with an already registered vehicle key.

   OK

   Engine starts normally.

Result: 

OK 

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) 

Result: 

NG 

REPLACE ECM 

(Refer to REMOVAL [10/2014 - ] )

1. Temporarily replace the ECM with a new one (Refer to REMOVAL [10/2014 - ] ).

Result: 

NEXT 

See step  13

1. Reregister the ECU communication ID (Refer to REGISTRATION [10/2014 - ] ).

Result: 

NEXT 

See step  14

1. Check that the engine starts with an already registered vehicle key.

   OK

   Engine starts normally.

Result: 

OK 

END (ECM WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)