Immobiliser System does not Operate Properly [08/2020 - 12/2021]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical or Powertrain / Smart Key or Engine / Trouble Codes.
5. Check for DTCs.

   Body Electrical > Smart Key > Trouble Codes 

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

Result: 

B 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 12/2021] 

Result: 

A 

See step  2

1. Enter the following menus: Powertrain / Engine / Data List.
2. Read the Data List according to the display on the Techstream.

   Powertrain > Engine > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Immobiliser Fuel Cut Status	Status of immobiliser fuel cut	OFF or ON	OFF: Fuel cut off ON: Fuel cut oN

   Powertrain > Engine > Data List 

   Tester Display
   Immobiliser Fuel Cut Status

   OK

   OFF is displayed after the engine is started.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ] 

Result: 

NG 

See step  3

1. Check that the engine starts within 5 seconds of the engine switch being turned on (IG).

   OK

   Engine starts normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

NG 

See step  4

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))	*b	Approximately 160 ms.
   *c	Approximately 270 ms.	*d	Approximately 40 ms.
   *e	Approximately 60 ms.	*f	IMO Waveform
   *g	IMI Waveform	*h	Waveform A
   *i	Waveform B	*j	Waveform C
   *k	Waveform A (detail)	-	-

   NOTE:

   The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   A15-3 (EFII) - Body ground	Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 2)
   A15-4 (EFIO) - Body ground	Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after cable disconnected and reconnected to battery	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 1 and 3)

   Result

   Result	Proceed to
   Normal waveform	A
   Waveform A is not output, or has abnormal wavelength or shape	B
   Waveform B is not output, or has abnormal wavelength or shape	C
   Waveform C is not output, or has abnormal wavelength or shape	D

Result: 

B 

See step  7

Result: 

C 

REPLACE ECM. Refer to  REMOVAL [08/2020 - 10/2022] 

Result: 

D 

See step  8

Result: 

A 

See step  5

1. Register the ECU communication ID codes.

   HINT: 

   Refer to Registration.

   Refer to REGISTRATION [08/2020 - 12/2021]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check that the engine starts.

   OK

   Engine starts normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (COMMUNICATION ID WAS NOT REGISTERED) 

Result: 

NG 

See step  8

1. Disconnect the A15 certification ECU (smart key ECU assembly) connector.
2. Disconnect the A24 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A15-3 (EFII) - A24-25 (IMO)	Always	Below 1 Ω
   A15-4 (EFIO) - A24-26 (IMI)	Always	Below 1 Ω
   A15-3 (EFII) or A24-25 (IMO) - Other terminals and body ground	Always	10 kΩ or higher
   A15-4 (EFIO) or A24-26 (IMI) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  8

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Replace the certification ECU (smart key ECU assembly) with a new one.

   Refer to REMOVAL [08/2020 - 12/2021]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  9

1. Register the recognition codes to the ECUs.

   HINT: 

   Refer to Registration.

   Refer to REGISTRATION [08/2020 - 12/2021]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  10

1. Register the ECU communication ID codes.

   HINT: 

   Refer to Registration.

   Refer to REGISTRATION [08/2020 - 12/2021]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  11

1. Check that the engine starts.

   OK

   Engine starts normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ]