Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).

NEXT

2.

CHECK FOR DTC

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

Result

Result

Proceed to

DTCs are not output

A

DTCs are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

3.

READ VALUE USING TECHSTREAM (IMMOBILISER FUEL CUT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream 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

B

GO TO SFI SYSTEM

C

GO TO SFI SYSTEM

A

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

B

GO TO STEP 15

C

USE SIMULATION METHOD TO CHECK

A

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)

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

B

GO TO STEP 12

C

GO TO STEP 13

A

6.

CHECK ECM (TERMINAL IMO)

(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

*c

Approximately 160 ms

*d

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)

Result

Result

Proceed to

Normal waveform

A

Waveform not output, or has abnormal wavelength or shape

B

B

GO TO STEP 9

A

7.

REGISTER ECU COMMUNICATION ID

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

NEXT

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.

OK

END (REGISTERED COMMUNICATION ID WAS DEFECTIVE)

NG

GO TO STEP 13

9.

REPLACE ECM

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

NEXT

10.

REGISTER ECU COMMUNICATION ID

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

NEXT

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.

OK

END (ECM WAS DEFECTIVE)

NG

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.

(c) Measure the resistance according to the value(s) in the table below.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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 ).

NEXT

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.

OK

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

NG

GO TO SFI SYSTEM

15.

CHECK ECM (TERMINAL IMI)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

*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

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

B

GO TO STEP 22

C

GO TO STEP 23

A

16.

CHECK ECM (TERMINAL IMO)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

*a

Component with harness connected

(ECM)

*b

Waveform

*c

Approximately 160 ms

*d

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

B

GO TO STEP 19

A

17.

REGISTER ECU COMMUNICATION ID

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

NEXT

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.

OK

END (REGISTERED COMMUNICATION ID WAS DEFECTIVE)

NG

GO TO STEP 23

19.

REPLACE ECM

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

NEXT

20.

REGISTER ECU COMMUNICATION ID

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

NEXT

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.

OK

END (ECM WAS DEFECTIVE)

NG

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.

(c) Measure the resistance according to the value(s) in the table below.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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 ).

NEXT

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.

OK

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

NG

GO TO SFI SYSTEM

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