DTC B2799-790: Engine Immobiliser System Malfunction [10/2015 - ]: Procedure

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2015 - ] ).

Result: 

NEXT 

See step  2

1. Start the hybrid control system.
2. Wait 10 seconds or more.
3. Check for DTCs (Refer to DTC CHECK / CLEAR [10/2015 - ] ).

   HINT: 

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

   Result

   Result	Proceed to
   OK	A
   NG (DTC B2799-790 is output)	B
   NG (Other DTCs are output)	C

Result: 

A 

USE SIMULATION METHOD TO CHECK 

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

Result: 

C 

GO TO DIAGNOSTIC TROUBLE CODE CHART 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2015 - ] )

Result: 

B 

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

   MEASUREMENT CONDITION
   
   

   Item	Content
   Tester Connection	D105-23 (IMO) - Body ground
   Tool Setting	2 V/DIV., 500 ms./DIV.
   Condition	Within 3 seconds of hybrid control system start, or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected

   OK

   The 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

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

   *a

   Component with harness connected (Hybrid Vehicle Control ECU Assembly)

   *b

   Waveform

   MEASUREMENT CONDITION
   
   

   Item	Content
   Tester Connection	D105-22 (IMI) - Body ground
   Tool Setting	2 V/DIV., 500 ms./DIV.
   Condition	Within 3 seconds of hybrid control system start, or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected

   OK

   The waveform is similar to that shown in the 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 [10/2015 - ] ).

Result: 

NEXT 

See step  6

1. Check that the hybrid control system starts with an already registered vehicle key.

   OK

   Hybrid control system starts normally.

Result: 

OK 

END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE) 

Result: 

NG 

See step  12

1. Disconnect the D105 hybrid vehicle control ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

2. Turn the power 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

Result: 

B 

See step  12

Result: 

A 

See step  8

1. Disconnect the D127 certification ECU (smart key ECU assembly) connector.
2. Disconnect the D105 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
   D127-13 (EFIO) - D105-22 (IMI)	Always	Below 1 Ω
   D127-14 (EFII) - D105-23 (IMO)	Always	Below 1 Ω
   D127-13 (EFIO) or D105-22 (IMI) - Body ground	Always	10 kΩ or higher
   D127-14 (EFII) or D105-23 (IMO) - 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) (Refer to REMOVAL [10/2014 - ] ).

Result: 

NEXT 

See step  10

1. Reregister the ECU communication ID (Refer to REGISTRATION [10/2015 - ] ).

Result: 

NEXT 

See step  11

1. Check that the hybrid control system starts with an already registered vehicle key.

   OK

   Hybrid control system starts normally.

Result: 

OK 

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

Result: 

NG 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [10/2015 - ] )

1. Temporarily replace the hybrid vehicle control ECU assembly with a new or known good one (Refer to REMOVAL [10/2015 - ] ).

Result: 

NEXT 

See step  13

1. Reregister the ECU communication ID (Refer to REGISTRATION [10/2015 - ] ).

Result: 

NEXT 

See step  14

1. Check that the hybrid control system starts with an already registered vehicle key.

   OK

   Hybrid control system starts normally.

Result: 

OK 

END (HYBRID VEHICLE CONTROL ECU ASSEMBLY WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL [10/2014 - ] )