Ignition System On-Vehicle Inspection

Check for DTCs (HILUX_TGN26 RM000000PDK0SXX.html).

NOTICE:

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

Check if sparks occur.

1. Remove the ignition coils and spark plugs (HILUX_TGN26 RM000000SK7015X.html).
   

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

3. Disconnect the 4 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.
      

Spark test procedure.

1. 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

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

   1. 1. Replace the ignition coil with igniter with a normal one.
      
   2. 2. Perform a spark test again.
      

      Result:

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

3. Check the spark plug.
   

   Result:

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

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

   1. 1. Turn the ignition switch to ON.
      
   2. 2. Check that there is battery voltage at the ignition coil positive (+) terminal.
      

      Result:

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

5. Check the camshaft position sensor (HILUX_TGN26 RM000000WBZ0GLX.html).
   

6. Check the crankshaft position sensor (HILUX_TGN26 RM000000TCW0NZX.html).
   

7. Check the IGT signal circuit (HILUX_TGN26 RM000000XH40MRX.html).
   

Connect the 4 injector connectors.

Install the 4 ignition coils and 4 spark plugs (HILUX_TGN26 RM000000SK5017X_01_0016.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

   HINT:

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

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	K20HR-U11

Check and adjust the spark plug electrode gap.

Standard electrode gap:

1.0 to 1.1 mm (0.0394 to 0.0433 in.)

Maximum electrode gap:

1.3 mm (0.0512 in.)

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

Air pressure:

588 kPa (6.0 kgf/cm², 85 psi)

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.