On-Vehicle Inspection

CHECK IGNITION COIL ASSEMBLY AND PERFORM SPARK TEST

NOTE: In this article, 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).

Check for DTCs.
NOTE: If any DTC is present, perform troubleshooting in accordance with the procedure for that DTC.
Check that sparks occur.
1. Remove the No. 1 engine cover.
2. Disconnect the 4 ignition coil connectors and remove the 4 bolts and ignition coils.
3. Using a 16 mm (0.63 in.) spark plug wrench, remove the 4 spark plugs.
  
  Fig 1: Removing Spark Plug
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Disconnect the 4 fuel injector connectors.
  
  Fig 2: Locating Fuel Injector Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Install the spark plug to each ignition coil, and connect the ignition coil connectors.
6. Ground the spark plug.
  
  Fig 3: Checking Ground Spark Plug
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Check if a spark occurs at each spark plug while the engine is being cranked.
  NOTE:
  - Be sure to ground the spark plugs when checking.
  - Replace the ignition coil if it receives an impact.
  - Do not crank the engine for more than 2 seconds.

Perform the spark test according to the flowchart below.

Check that the ignition coil connector is securely connected.

Result

SPARK TEST RESULT CHART (1 OF 2)

Result	Proceed to
NG	Connect securely
OK	Go to next step

Perform the spark test on each ignition coil.

Replace the ignition coil with a normal one.
Perform the spark test again.
Result

SPARK TEST RESULT CHART (2 OF 2)

Result	Proceed to
OK	Replace Ignition coil
NG	Go to next step

Check the power supply to the ignition coil.

Turn the ignition switch to the ON position.
Measure the voltage between the terminals of the wire harness side connector.

Fig 4: Measuring Voltage Between Terminals Of Wire Harness Side Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

POWER SUPPLY TO THE IGNITION COIL (1 OF 2)

Tester Connection	Specified Condition
1 (+B) - 4 (GND)	9 to 14 V

Result

POWER SUPPLY TO THE IGNITION COIL (2 OF 2)

Result	Proceed to
NG	Check wire harness and connector
OK	Go to next step

Measure the resistance of the camshaft position sensor.

Standard resistance

CAMSHAFT POSITION SENSOR (1 OF 2)

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

Result

CAMSHAFT POSITION SENSOR (2 OF 2)

Result	Proceed to
NG	Replace camshaft position sensor
OK	Go to next step

Measure the resistance of the crankshaft position sensor.

Standard resistance

CRANKSHAFT POSITION SENSOR (1 OF 2)

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

Result

CRANKSHAFT POSITION SENSOR (2 OF 2)

Result	Proceed to
NG	Replace crankshaft position sensor
OK	Go to next step

Check the IGT signal from the ECM.

Result

IGT SIGNAL FROM THE ECM

Result	Proceed to
NG	Check ECM (see DTC P0351 IGNITION COIL "A" PRIMARY / SECONDARY CIRCUIT; DTC P0352 IGNITION COIL "B" PRIMARY / SECONDARY CIRCUIT; DTC P0353 IGNITION COIL "C" PRIMARY / SECONDARY CIRCUIT; DTC P0354 IGNITION COIL "D" PRIMARY / SECONDARY CIRCUIT )
OK	Repair wiring between ignition coil and ECM

Using a 16 mm (0.63 in.) plug wrench, install the spark plug.
Torque: 19 N*m (194 kgf*cm, 14 ft.*lbf)
Install the 4 ignition coils with the 4 bolts and connect the 4 ignition coil connectors.
Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf)
Connect the 4 fuel injector connectors.
Install the No. 1 engine cover.

CHECK SPARK PLUG

Check the electrode.
1. Using a megohmmeter, measure the insulation resistance.
  Standard insulation resistance: 10 MΩ or more
  
  HINT:
  - If a megohmmeter is not available, perform the following simple inspection instead.
  - If the result is 10 MΩ or less, clean the plug and measure the resistance again.
  Fig 5: Measuring Insulation Resistance
  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 the next step.

Check the spark plug for any damage to its threads and insulator.

Fig 6: Identifying Spark Plug Condition

If there is damage, replace the spark plug.

Recommended spark plug

RECOMMENDED SPARK PLUG CHART

Manufacturer	Spark plug type
DENSO	SK20R11
NGK	IFR6A11

Check the spark plug electrode gap.

Fig 7: Identifying Spark Plug Electrode Gap
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.)
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 kgf*cm ² , 85 psi)

Standard duration: 20 seconds or less

Fig 8: Cleaning Electrode With Spark Plug Cleaner
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.