Toyota Tacoma (2015-2018) Service Manual: Engine does not Start because No Initial Combustion

Toyota Tacoma (2015-2018) Service Manual / Engine Immobiliser / Engine Immobiliser System(w/o Smart Key System) / Engine does not Start because No Initial Combustion

DESCRIPTION

When a key is inserted into the ignition key cylinder, the transponder key coil receives the key ID code and sends it to the transponder key ECU assembly.
If an error in communication between the transponder key coil and transponder key ECU assembly occurs, this symptom may occur.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the transponder key ECU assembly or key 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 SECURITY INDICATOR LIGHT OPERATION

(a) Check that the security indicator light turns off when a registered key is inserted into the ignition key cylinder.

OK:

Security indicator light turns off.

Result

Result	Proceed to
NG	A
OK	B

GO TO OTHER DIAGNOSIS PROCEDURE (Engine does not Start but Initial Combustion Occurs)

5.	CHECK SECURITY INDICATOR LIGHT OPERATION

(a) Check that the security indicator light turns off when another registered key is inserted into the ignition key cylinder.

OK:

Security indicator light turns off.

GO TO STEP 7

6.	CHECK WHETHER ENGINE STARTS

(a) Using another 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
Engine cannot be started	A
Engine can be started	B

GO TO OTHER DIAGNOSIS PROCEDURE (Engine does not Start but Initial Combustion Occurs)

GO TO STEP 11

7.	REPLACE TRANSPONDER KEY COIL

(a) Replace the transponder key coil (See page ).

8.	CHECK WHETHER ENGINE STARTS

(a) Using another 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
Engine can be started	A
Engine cannot be started	B

END (TRANSPONDER KEY COIL WAS DEFECTIVE)

9.	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 ).

10.	CHECK WHETHER ENGINE STARTS

(a) Using another 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
Engine can be started	A
Engine cannot be started	B

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

11.	REPLACE KEY

(a) Replace the key.

NOTICE:

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

12.	CHECK WHETHER ENGINE STARTS

(a) Using another 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
Engine can be started	A
Engine cannot be started (for 2TR-FE)	B
Engine cannot be started (for 2GR-FKS)	C

END (KEY WAS DEFECTIVE)

GO TO SFI SYSTEM

Transponder Chip Malfunction (B2793,B2794,B2797,B2798)

DESCRIPTION DTC B2793 is stored when a malfunction is found in the key during key code registration or a key code is not registered normally. Replace the key if key code registration c ...

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 co ...

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