Ignition System: Inspection

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

INSPECT SPARK PLUG

NOTE:

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

Check the electrode.
1. Using an mega Ω meter, measure the insulation resistance.
  Insulation resistance: 10 MΩ or higher
  
  If the resistance is less than the specified value, proceed to step ( d).
  
  HINT:
  
  If an ohmmeter is not available, perform the following simple inspection instead.
  
  Fig 1: Checking Electrode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Alternative inspection method:
1. Quickly accelerate the engine to 4,000 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 steps below.
Fig 2: Alternative Inspection Method
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the spark plug for any damage on its thread and insulator.

If there is a damage, replace the spark plug. If not, reinstall the spark plug.

Recommended spark plug:

SPARK PLUG SPECIFICATION

DENSO made	SK20R11
NGK made	IFR6A11

Check the spark plug electrode gap.
Maximum electrode gap for used spark plug: 1.3 mm (0.051 in.)

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

Electrode gap for new spark plug: 1.0 to 1.1 mm (0.039 to 0.043 in.)

NOTE: 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.

Fig 3: Checking Spark Plug Electrode Gap
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CRANKSHAFT POSITION SENSOR

Measure the resistance between the terminals.

Standard:

CRANKSHAFT POSITION SENSOR

Temperature	Specified Condition
Cold	835 to 1,400 ohms
Hot	1,060 to 1,645 ohms

If the resistance is not as specified, replace the sensor.

Fig 4: Inspecting Crankshaft Position Sensor

INSPECT CAMSHAFT POSITION SENSOR

Measure the resistance between the terminals.

Standard:

CAMSHAFT POSITION SENSOR

Temperature	Specified Condition
Cold	1,630 to 2,740 ohms
Hot	2,065 to 3,225 ohms

If the resistance is not as specified, replace the sensor.

Fig 5: Inspecting Camshaft Position Sensor