Toyota Tacoma 2015-2018 Service Manual: Immobiliser System does not Operate Properly

Toyota Tacoma 2015-2018 Service Manual / Engine Immobiliser / Engine Immobiliser System(w/ Smart Key System) / Immobiliser System does not Operate Properly

DESCRIPTION

The engine immobiliser system compares the ID code that is registered in the certification ECU (smart key ECU assembly) with the ID code of the transponder chip that is embedded in the electrical key transmitter sub-assembly.

WIRING DIAGRAM

(See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

CAUTION:

The engine immobiliser system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the engine immobiliser system after confirming that the communication systems are functioning properly (See page ).
Before replacing the ECM or certification ECU (smart key ECU assembly), refer to Registration (See page ).
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT:

If an engine immobiliser system or SFI system DTC is output, first perform troubleshooting for the engine immobiliser system or SFI system DTC.

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs (See page Result ).

Result

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

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	READ VALUE USING TECHSTREAM (IMMOBILISER FUEL CUT)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) Read the Data List according to the display on the Techstream.

Engine

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

OK:

OFF is displayed after the engine is started.

Result

Result	Proceed to
NG	A
OK	B

GO TO SFI SYSTEM

3.	CHECK WHETHER ENGINE STARTS

(a) Check that the engine starts 5 seconds after the engine switch turned on (IG).

OK:

Engine starts normally.

Result

Result	Proceed to
NG	A
OK	B

USE SIMULATION METHOD TO CHECK

4.	INSPECT ECM (TERMINAL IMI AND IMO)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

*a	Component with harness connected (ECM)	*b	Approximately 160 ms
*c	Approximately 270 ms	*d	Approximately 40 ms
*e	Approximately 60 ms	*f	Waveform (IMO)
*g	Waveform (IMI)	*h	Waveform A
*i	Waveform B	*j	Waveform C
*i	Waveform A (detail)	-	-

NOTICE:

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
E14-9 (IMO) - E11-1 (E1)	Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform (IMO))
E14-8 (IMI) - E11-1 (E1)	Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform (IMI))

Tester Connection

Condition

Tool Setting

Specified Condition

E14-9 (IMO) - E11-1 (E1)

Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

2 V/DIV., 500 ms./DIV.

Pulse generation

(See waveform (IMO))

E14-8 (IMI) - E11-1 (E1)

Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected

2 V/DIV., 500 ms./DIV.

Pulse generation

(See waveform (IMI))

Result

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

GO TO STEP 7

REPLACE ECM

GO TO STEP 8

5.	REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID (See page ).

6.	CHECK WHETHER ENGINE STARTS

(a) Check that the engine starts.

OK:

Engine starts normally.

END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

GO TO STEP 8

7.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM)

(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the E14 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C27-7 (EFII) - E14-9 (IMO)	Always	Below 1 Ω
C27-6 (EFIO) - E14-8 (IMI)	Always	Below 1 Ω
C27-7 (EFII) or E14-9 (IMO) - Body ground	Always	10 kΩ or higher
C27-6 (EFIO) or E14-8 (IMI) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

9.	REGISTER RECOGNITION CODE

(a) Register the recognition codes in the ECUs (See page ).

10.	REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID (See page ).

11.	CHECK WHETHER ENGINE STARTS

(a) Check that the engine starts.

OK:

Engine starts normally.

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

GO TO SFI SYSTEM

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