Toyota Tundra Service Manual: Engine does not Start because No Initial Combustion

Toyota Tundra Service Manual / Vehicle Interior / 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.

Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

HINT:

Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

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 / Data List.

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

Engine and ECT

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Immobiliser Fuel Cut

Status of engine immobiliser system fuel cut / ON or OFF

ON: Immobiliser fuel cut on

OFF: Immobiliser fuel cut off

-

OK:

OFF is displayed after the engine is started.

OK (for 1UR-FE)

GO TO SFI SYSTEM

OK (for 3UR-FE)

GO TO SFI SYSTEM

OK (for 3UR-FBE)

GO TO SFI SYSTEM

NG

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.

OK

GO TO ENGINE DOES NOT START BUT INITIAL COMBUSTION OCCURS

NG

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.

NG

GO TO STEP 7

OK

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.

OK

GO TO STEP 13

NG

GO TO ENGINE DOES NOT START BUT INITIAL COMBUSTION OCCURS

7.

REPLACE TRANSPONDER KEY COIL

(a) Replace the transponder key coil.

Click here

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.

Result

Proceed to

Engine can be started

A

Engine cannot be started

B
A

END (TRANSPONDER KEY COIL WAS DEFECTIVE)
B

9.

REPLACE TRANSPONDER KEY ECU ASSEMBLY

(a) Replace the transponder key ECU assembly with a new one.

Click here

NEXT

10.

REGISTER KEY

(a) Register the key.

Click here

NEXT

11.

REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID.

Click here

NEXT

12.

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

13.

REPLACE KEY

(a) Replace the key.

NOTICE:

Key ID code registration is necessary when replacing the key.

Click here

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 (KEY WAS DEFECTIVE)
NG (for 1UR-FE)

GO TO SFI SYSTEM

NG (for 3UR-FE)

GO TO SFI SYSTEM

NG (for 3UR-FBE)

GO TO SFI SYSTEM

    Dtc Check / Clear

    Engine does not Start but Initial Combustion Occurs

    See More:

    Toyota Tundra Service Manual > Theft Deterrent: Security Horn Assembly
    Components COMPONENTS ILLUSTRATION Inspection INSPECTION PROCEDURE 1. INSPECT SECURITY HORN ASSEMBLY (a) Apply battery voltage and check operation of the horn. OK: Measurement Condition Specified Condition Battery positive (+) → Terminal 1 Battery negative (-) → Horn bracket Horn sounds If the r ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2025 Copyright www.ttundra.com
    0.0095