Ignition System 3UR-FE Land Cruiser

Parts location

System diagram

ON-Vehicle inspection

 

Parts location

 

System diagram

 

ON-Vehicle inspection

PERFORM SPARK TEST

1. Check for DTCs .

   NOTICE:

   If any DTC is output, perform troubleshooting procedures for that DTC.

2. Check if sparks occur.

   1. Remove the ignition coils and spark plugs .

   2. Install the spark plug to the ignition coil and connect the ignition coil connector.

   3. Disconnect the 8 injector connectors.

   4. Ground the spark plug.

   5. Visually check that sparks occur while the engine is being cranked.

      NOTICE:

      1. Be sure to ground the spark plug when checking.
      2. If the ignition coil has been struck or dropped, replace it.
      3. Do not crank the engine for more than 2 seconds.

3. Check that the wire harness side connector of the ignition coil with igniter is securely connected.

   Result

   Result	Proceed to
   NG	Connect securely
   OK	Go to next step

4. Perform a spark test on each ignition coil with igniter.

   1. If there is a cylinder where sparks do not occur, replace its ignition coil with the ignition coil of a cylinder where sparks occur normally.

   2. Crank the engine and visually check that sparks occur at the cylinder with the normally operating ignition coil.

      Result

      Result	Proceed to
      OK	Replace ignition coil with igniter
      NG	Go to next step

5. Check spark plug.

   Result

   Result	Proceed to
   NG	Replace spark plug
   OK	Go to next step

6. Check the power supply to the ignition coil with igniter.

   1. Turn the engine switch on (IG).

   2. Check that there is battery voltage at the ignition coil positive (+) terminal.

      Result

      Result	Proceed to
      NG	Check wiring between engine switch and ignition coil with igniter
      OK	Go to next step

7. Check the VVT sensor for intake side .

8. Check the VVT sensor for exhaust side .

9. Check the camshaft position sensor .

10. Check the crankshaft position sensor .

11. Check the IGT signal circuit .

12. Connect the 8 injector connectors.

13. Install the ignition coils and spark plugs .

2. INSPECT SPARK PLUG

NOTICE:

1. Do not use a wire brush for cleaning.
2. Do not attempt to adjust the electrode gap of a used spark plug.

1. Check the electrode.

   

   1. Using a megohmmeter, measure the insulation resistance.

      Standard Insulation Resistance:

      Tester Connection	Condition	Specified Condition
      Spark plug (terminal part) - Body ground	Always	10 M? or higher

      Text in Illustration

      *1

      Ground

      If the insulation resistance is below the specified range, replace the spark plug.

      HINT:

      If a megohmmeter is not available, perform the following simple inspection instead.

2. Alternative inspection method:

   1. Quickly accelerate the engine to 4000 rpm 5 times.

   2. Remove the spark plug.

   3. Visually check the spark plug. If the electrode is dry, the spark plug is functioning properly. If the electrode is damp, proceed to the next step.

3. Check the spark plug for any damage to its threads and insulator. If there is any damage, replace the spark plug.

   Recommended Spark Plug:

   Manufacturer	Type
   DENSO made	SK20HR11

   HINT:

   Maximum electrode gap for a used spark plug: 1.3 mm (0.0512 in.).

   If the gap is more than the maximum, replace the spark plug.

   Electrode gap for a new spark plug: 1.0 to 1.1 mm (0.0394 to 0.0433 in.).

   NOTICE:

   If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap of a used plug.

   If the electrode has traces of wet carbon, allow it to dry and then clean it with a spark plug cleaner.

   Standard air pressure:

   588 kPa (6.0 kgf/cm², 85 psi)

   Standard duration:

   20 seconds or less

   HINT:

   Only use the spark plug cleaner when the electrode is free of oil. If the electrode has traces of oil, use gasoline to clean off the oil before using the spark plug cleaner.