Engine Ignition System (2AZ-FE): Inspection

NOTE: In this section 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 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 ohmmeter, measure the insulation resistance.
  
  Fig 1: Measuring Insulation Resistance Using Ohmmeter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Correct insulation resistance: 10 MΩ or more

If the resistance is less than the specified value, proceed to step (d).

HINT:

If the ohmmeter is not available, perform the following simple inspection instead.
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. Proceed to step 2.
  - If the electrode is damp, proceed to steps ( c), ( d) and ( e).
4. Install the spark plug.

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

Fig 2: Checking Spark Plug Electrode

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If there is damage, replace the spark plug.

Recommended spark plug:

RECOMMENDED SPARK PLUG REFERENCE

DENSO made	SK20R1
NGK made	IFR6A11

Check the spark plug electrode gap.

Fig 3: Checking Spark Plug Electrode Gap

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Maximum electrode gap for used spark plug:

SPARK PLUG ELECTRODE GAP SPECIFICATION

P-ZEV	1.33 mm (0.052 in.)
Except P-ZEV	1.3 mm (0.051 in.)

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

Correct 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 on a used plug.

Clean the spark plugs.

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

Fig 4: Cleaning Spark Plug Electrode Using Spark Plug Cleaner

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Air pressure: 588 kPa (6 kgf/cm ² , 85 psi)

Duration: 20 seconds or less

HINT:

Use the spark plug cleaner only 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.

INSPECT CAMSHAFT POSITION SENSOR

Using an ohmmeter, measure the resistance between the terminals.

Standard:

CAMSHAFT POSITION SENSOR TERMINAL RESISTANCE SPECIFICATION

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

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

INSPECT CRANKSHAFT POSITION SENSOR

Using an ohmmeter, measure the resistance between the terminals.

Standard:

CRANKSHAFT POSITION SENSOR TERMINAL RESISTANCE SPECIFICATION

Temperature	Specified Condition
Cold	985 to 1,600 Ω
Hot	1,265 to 1,890 Ω

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