Ignition system 2ZR-FXE

Ignition system Lexus
Parts location

Ignition system lexus
System diagram

Ignition system lexus
On-vehicle inspection

1. Check for DTCs .

   NOTICE:

   If any DTC is present, perform troubleshooting in accordance with the procedure for that DTC.

2. Check that spark occurs.

   1. 

      Remove the ignition coils and spark plugs .

   2. Disconnect the 4 fuel injector connectors.

   3. Set the vehicle to inspection mode (Step 3) .

   4. Install the spark plug into the ignition coil, and then connect the ignition coil connector. (Step 4)

   5. Ground the spark plug. (Step 5)

   6. 

      Check that spark occurs while the engine is being cranked. (Step 6)

      HINT:

      Repeat steps 3 to 6 for each spark plug and ignition coil.

      NOTICE:

      1. Ground the spark plugs when checking them.
      2. Replace any ignition coils that have been subjected to any physical impacts.
      3. Do not crank the engine for more than 2 seconds.
      If spark does not occur, perform the following procedure for the malfunctioning cylinder.

3. Perform the following spark test procedure.

   1. Check that the ignition coil connector is securely connected.

      Result:

      Result	Action
      NG	Connect securely
      OK	Go to next step

   2. Perform a spark test.

      1. Replace the ignition coil with a known good one.
      2. Set the vehicle to inspection mode .
      3. Perform the spark test again.

      Result:

      Result	Action
      NG	Go to next step
      OK	Replace ignition coil

   3. Perform a spark test.

      1. Replace the spark plug with a known good one.
      2. Set the vehicle to inspection mode .
      3. Perform the spark test again.

      Result:

      Result	Action
      NG	Go to next step
      OK	Replace the spark plug

   4. Check the power supply.

      Text in Illustration

      *a	Front view of wire harness connector (to Ignition Coil)

      1. Turn the power switch on (IG).
      2. Measure the voltage according to the value(s) in the table below.

         

         Standard Voltage:

         Tester Connection	Condition	Specified Condition
         1 (+B) - 4 (GND)	Power switch on (IG)	11 to 14 V

         Result:

         Result	Action
         NG	Check wiring between auxiliary battery and ignition coil and check ground circuit
         OK	Replace the ECM

   5. Connect the 4 fuel injector connectors.

   6. 

      Install the ignition coils and spark plugs .

1. Check the electrode.

   Text in Illustration

   *a

   Ground

   1. Using a megohmmeter, measure the resistance.

      Standard Resistance:

      10 M? or more

      If the result is 10 M? or less, clean the plug and measure the resistance again.

      HINT:

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

2. Alternative inspection method:

   1. Quickly accelerate the engine to approximately 2500 rpm 5 times.

   2. Remove each 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	Spark Plug Type
   DENSO	SC20HR11

4. Check the spark plug electrode gap.

   Text in Illustration

   *a	Spark Plug Electrode Gap

   Maximum Electrode Gap for Used Spark Plug:

   Electrode Gap

   1.3 mm (0.0512 in.)

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

   Electrode Gap for New Spark Plug:

   Electrode Gap

   1.0 to 1.1 mm (0.0394 to 0.0433 in.)

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

   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.