Toyota Tacoma (2015-2018) Service Manual: Engine does not Start but Initial Combustion Occurs

Toyota Tacoma (2015-2018) Service Manual / Engine Immobiliser / Engine Immobiliser System(w/o Smart Key System) / Engine does not Start but Initial Combustion Occurs

DESCRIPTION

If the key ID codes of the key and transponder key ECU assembly match, the engine immobiliser system is unset and the engine start permission signal is sent to the ECM. When the ID codes of the transponder key ECU assembly and ECM match, the engine starts.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the transponder key ECU assembly or ECM is replaced, refer to Registration (See page PROCEDURE ).

PROCEDURE

CLEAR DTC

(a) Clear the DTCs (See page ).

2.	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

3.	READ VALUE USING TECHSTREAM (IMMOBILISER FUEL CUT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

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

Engine and ECT (for 2TR-FE)

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

Engine (for 2GR-FKS)

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 ignition switch is turned ON.

Result

Result	Proceed to
NG	A
OK (for 2TR-FE)	B
OK (for 2GR-FKS)	C

GO TO SFI SYSTEM

4.	CHECK WHETHER ENGINE STARTS

(a) Using a registered key, turn the ignition switch to ON.

(b) Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK:

Engine starts normally.

Result

Result	Proceed to
NG (for 2TR-FE)	A
NG (for 2GR-FKS)	B
OK	C

GO TO STEP 15

USE SIMULATION METHOD TO CHECK

5.	CHECK ECM (TERMINAL IMI)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

*A	for Automatic Transmission	*B	for Manual Transmission
*a	Component with harness connected (ECM)	*b	Waveform 1
*c	Waveform 2	*d	Approximately 160 ms
*e	Approximately 270 ms	-	-

Measurement Condition:

Tester Connection	Condition	Tool Setting	Specified Condition
E20-10 (IMI) - Body ground	Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

Tester Connection

Condition

Tool Setting

Specified Condition

E20-10 (IMI) - Body ground

Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

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

Pulse generation

(See waveform)

Result

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

GO TO STEP 12

GO TO STEP 13

6.	CHECK ECM (TERMINAL IMO)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

for Automatic Transmission

for Manual Transmission

Component with harness connected

(ECM)

Waveform

Approximately 160 ms

Approximately 270 ms

Measurement Condition:

Tester Connection	Condition	Tool Setting	Specified Condition
E20-9 (IMO) - Body ground	Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

Tester Connection

Condition

Tool Setting

Specified Condition

E20-9 (IMO) - Body ground

Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

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

Pulse generation

(See waveform)

Result

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

GO TO STEP 9

7.	REGISTER ECU COMMUNICATION ID

(a) Register the communication ID between the transponder key ECU assembly and ECM (See page ).

8.	CHECK WHETHER ENGINE STARTS

(a) Using a registered key, turn the ignition switch to ON.

(b) Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK:

Engine starts normally.

END (REGISTERED COMMUNICATION ID WAS DEFECTIVE)

GO TO STEP 13

9.	REPLACE ECM

(a) Temporarily replace the ECM with a new one (See page ).

10.	REGISTER ECU COMMUNICATION ID

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

11.	CHECK WHETHER ENGINE STARTS

(a) Using a registered key, turn the ignition switch to ON.

(b) Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK:

Engine starts normally.

END (ECM WAS DEFECTIVE)

GO TO SFI SYSTEM

12.	CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)

(a) Disconnect the T10 transponder key ECU assembly connector.

(b) Disconnect the E20 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
T10-13 (EFIO) - E20-10 (IMI)	Always	Below 1 Ω
T10-13 (EFIO) or E20-10 (IMI) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	REPLACE TRANSPONDER KEY ECU ASSEMBLY

(a) Replace the transponder key ECU assembly with a new one (See page NOTICE: ).

NOTICE:

Key ID code registration is necessary when replacing the transponder key ECU assembly, refer to Registration (See page ).

14.	CHECK WHETHER ENGINE STARTS

(a) Using a registered key, turn the ignition switch to ON.

(b) Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK:

Engine starts normally.

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

GO TO SFI SYSTEM

15.	CHECK ECM (TERMINAL IMI)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

Component with harness connected

(ECM)

Waveform 1

Waveform 2

Approximately 160 ms

Approximately 270 ms

Measurement Condition:

Tester Connection

Condition

Tool Setting

Specified Condition

E14-8 (IMI) - Body ground

Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

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

Pulse generation

(See waveform)

Result

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

GO TO STEP 22

GO TO STEP 23

16.	CHECK ECM (TERMINAL IMO)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

Component with harness connected

(ECM)

Waveform

Approximately 160 ms

Approximately 270 ms

Measurement Condition:

Tester Connection

Condition

Tool Setting

Specified Condition

E14-9 (IMO) - Body ground

Within 3 seconds of starter operation and initial combustion, or within 3 seconds of ignition switch first being turned to ON after cable disconnected and reconnected to negative (-) battery terminal

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

Pulse generation

(See waveform)

Result

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

GO TO STEP 19

17.	REGISTER ECU COMMUNICATION ID

(a) Register the communication ID between the transponder key ECU assembly and ECM (See page ).

18.	CHECK WHETHER ENGINE STARTS

(a) Using a registered key, turn the ignition switch to ON.

(b) Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK:

Engine starts normally.

END (REGISTERED COMMUNICATION ID WAS DEFECTIVE)

GO TO STEP 23

19.	REPLACE ECM

(a) Temporarily replace the ECM with a new one (See page ).

20.	REGISTER ECU COMMUNICATION ID

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

21.	CHECK WHETHER ENGINE STARTS

(a) Using a registered key, turn the ignition switch to ON.

(b) Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK:

Engine starts normally.

END (ECM WAS DEFECTIVE)

GO TO SFI SYSTEM

22.	CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)

(a) Disconnect the T10 transponder key ECU assembly connector.

(b) Disconnect the E14 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
T10-13 (EFIO) - E14-10 (IMI)	Always	Below 1 Ω
T10-13 (EFIO) or E14-10 (IMI) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

23.	REPLACE TRANSPONDER KEY ECU ASSEMBLY

(a) Replace the transponder key ECU assembly with a new one (See page NOTICE: ).

NOTICE:

Key ID code registration is necessary when replacing the transponder key ECU assembly, refer to Registration (See page ).

24.	CHECK WHETHER ENGINE STARTS

(a) Using a registered key, turn the ignition switch to ON.

(b) Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK:

Engine starts normally.

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

GO TO SFI SYSTEM

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