Ignition System On-Vehicle Inspection

Check for DTCs (HILUX_TGN26 RM000000PDK0X5X.html).

NOTICE:

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

Check if sparks occur.

1. Remove the 6 spark plugs (HILUX_TGN26 RM0000015PS00BX.html).
   

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

3. Disconnect the 6 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.
      
   1. Replace the ignition coil if it receives an impact.
      
   1. Do not crank the engine for more than 2 seconds.
      

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

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

Inspect the spark plug.

1. Replace the spark plug with a normal one.
   

2. Perform spark test again.
   

   Result

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

Check the power supply to the ignition coil with igniter.

1. Turn the ignition switch to ON.
   

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

   Result

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

Check the VVT sensor (HILUX_TGN26 RM000000WBZ0J5X.html).

Check the crankshaft position sensor (HILUX_TGN26 RM000000TCW0QWX.html).

Check the IGT signal circuit (HILUX_TGN26 RM000000XH40PNX.html).

Install the 6 spark plugs (HILUX_TGN26 RM0000015PQ00EX.html).

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 MΩ or higher

   Text in Illustration

   *1	Body Ground

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

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.
   

Check the spark plug for any damage on its threads and insulator.
If there is damage, replace the spark plug. If not, reinstall the spark plug.

Recommended Spark Plug:

Manufacturer	Product
DENSO made	K20HR-U11
NGK made	LFR6C11

Clean the spark plugs.

Check and adjust the electrode gap.

Electrode gap for new spark plug:

1.0 to 1.1 mm (0.0394 to 0.0433 in.)

Maximum electrode gap for used spark plug:

1.3 mm (0.0512 in.)