Immobilizer System does not Operate Properly [10/2022 - 08/2023]: Procedure

1. Check for DTCs.

   Body Electrical > Smart Access > Trouble Codes 

   Powertrain > Hybrid Control > 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 [10/2022 - ] 

Result: 

A 

See step  2

1. Check that the hybrid control system starts within 5 seconds of the ignition switch being turned ON (READY).

   OK

   Hybrid control system starts normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

Result: 

NG 

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)	*b	Approximately 160 ms.
   *c	Approximately 270 ms.	*d	Approximately 40 ms.
   *e	Approximately 60 ms.	*f	Terminal IMO
   *g	Terminal IMI	*h	Waveform 1
   *i	Waveform 2	*j	Waveform 3
   *k	Waveform 1 (detail)	-	-

   NOTE:

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

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   C59-39 (IMO) - Body ground	Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after auxiliary battery cable disconnected and reconnected	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 2)
   C59-53 (IMI) - Body ground	Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after auxiliary battery cable disconnected and reconnected	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 1 and 3)

   Result

   Result	Proceed to
   Normal waveform	A
   Waveform 1 is not output, or has abnormal wavelength or shape	B
   Waveform 2 is not output, or has abnormal wavelength or shape	C
   Waveform 3 is not output, or has abnormal wavelength or shape	D

Result: 

B 

See step  6

Result: 

C 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [10/2022 - ] 

Result: 

D 

See step  7

Result: 

A 

See step  4

1. Register the ECU communication ID codes.

   Refer to REGISTRATION [10/2022 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Check that the hybrid control system starts.

   OK

   Hybrid control system starts normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE) 

Result: 

NG 

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to  REMOVAL [10/2022 - 08/2023] 

1. Disconnect the C54 ID code box (immobilizer code ECU) connector.
2. Disconnect the C59 hybrid vehicle control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C54-3 (EFII) - C59-39 (IMO)	Always	Below 1 Ω
   C54-3 (EFII) or C59-39 (IMO) - Other terminals and body ground	Always	10 kΩ or higher
   C54-4 (EFIO) - C59-53 (IMI)	Always	Below 1 Ω
   C54-4 (EFIO) or C59-53 (IMI) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  7

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Replace the ID code box (immobilizer code ECU) with a new one.

   Refer to REMOVAL [10/2022 - 08/2023]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  8

1. Register the recognition codes to the ECUs.

   Refer to REGISTRATION [10/2022 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  9

1. Register the ECU communication ID codes.

   Refer to REGISTRATION [10/2022 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  10

1. Check that the hybrid control system starts.

   OK

   Hybrid control system starts normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (ID CODE BOX (IMMOBILIZER CODE ECU) WAS DEFECTIVE) 

Result: 

NG 

GO TO HYBRID CONTROL SYSTEM 

for THS-HEV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]

for 1Motor-HEV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]