NOTE: In this article, the terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10°C (14°F) to 50°C (122°F). "Hot" means approximately 50°C (122°F) to 100°C (212°F).

INSPECT IGNITION COIL ASSY (WITH IGNITER) AND PERFORM SPARK TEST
1. Check for DTCs.
  NOTE: If a DTC is present, perform troubleshooting in accordance with the procedure for that DTC.
2. Check if sparks occur.
  1. Remove the ignition coil (see REPLACEMENT ).
  2. Remove the spark plug.
  3. Install the spark plug to the ignition coil, and connect the ignition coil connector.
  4. Disconnect the 8 injector connectors.
  5. Ground the spark plug.
  6. Visually check if spark occurs while the engine is being cranked.
    NOTE:
    Be sure to ground the spark plug when checking.
    
    Replace the ignition coil if it is given physical impact.
    
    Do not crank the engine for more than 2 seconds.
    If a spark does not occur, perform the test as follows:
    
    Fig 1: Spark Test Flow Diagram
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Using a 16 mm (0.63 in.) plug wrench, install the spark plugs.
    Torque: 18 N.m (180 kgf.cm, 13 ft.lbf)
  8. Install the ignition coils (see REPLACEMENT ).

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

On-Vehicle Inspection

Use the Manual With the Right Hardware

When to See a Mechanic

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