On-Vehicle Inspection

INSPECT IGNITION COIL AND PERFORM SPARK TEST

Check for DTCs (See DTC CHECK / CLEAR ).
NOTE: If any DTC is present, perform troubleshooting in accordance with the procedure for that DTC.
Check whether spark occurs.
1. Remove the 4 ignition coils and 4 spark plugs (See REMOVAL ).
2. Disconnect the 4 fuel injector connectors.
  
  Fig 1: Locating Fuel Injector Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Install the spark plug into the ignition coil and connect the ignition coil connector.
4. Ground the spark plug.
5. Check that spark occurs while the engine is being cranked.
  
  Fig 2: Identifying Ignition Coils Connector Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - Ground the spark plug when checking it.
  - Replace any ignition coils that have been subjected to any physical impact.
  - Do not crank the engine for more than 2 seconds.
  If spark does not occur, perform the following procedure.

Perform the following spark test procedure.

Check that the wire harness side connector of the ignition coil with igniter is securely connected.

Result

RESULT REFERENCE

Result	Action
NG	Connect securely
OK	Go to next step

Perform the spark test on each ignition coil with igniter.

Replace the ignition coil with igniter with a known good one.
Perform the spark test again.

Result

RESULT REFERENCE

Result	Action
NG	Go to next step
OK	Replace ignition coil with igniter

Check the spark plug.

Replace the spark plug with a known good one.
Perform the spark test again.

Result

RESULT REFERENCE

Result	Action
NG	Go to next step
OK	Replace spark plug

Check that power is supplied to each ignition coil with igniter.

Disconnect each ignition coil connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open)

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
4 (GND) - Body ground	Always	Below 1 Ω

Fig 3: Checking Spark Plug Ignition

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Perform the same procedure for each ignition coil.

Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
1 (+B) - 4 (GND)	Ignition switch ON	11 to 14 V

HINT:

Perform the same procedure for each ignition coil.

Result

RESULT REFERENCE

Result	Action
NG	Check wiring between ignition switch and ignition coil with igniter
OK	Go to next step

Check the resistance of the crankshaft position sensor (See REMOVAL ).

Result

RESULT REFERENCE

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

Check the IGT signals from the 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 ).

Result

RESULT REFERENCE

Result	Action
NG	Check ECM
OK	Repair wiring between ignition coil and ECM

Connect the 4 injector connectors.
Install the 4 ignition coils and 4 spark plugs (See REMOVAL ).

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.

Fig 4: Identifying Ignition Coil Connector Terminal

Check the electrode.
1. Using a megohmmeter, measure the insulation resistance.
  Standard Resistance:
  
  10 MΩ or more
  
  Fig 5: Measuring Insulation Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.
  - If a megohmmeter is not available, perform the following simple inspection instead.
Alternative inspection method:
1. Quickly accelerate the engine to 4000 rpm 5 times.
2. Remove the spark plug (See REMOVAL ).
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.

If there is any damage, replace the spark plug.

Fig 6: Identifying Spark Plug Electrode

Recommended Spark Plug

SPARK PLUG SPECIFICATION

Manufacturer	Product
DENSO	SK20R11
NGK	IFR6A11

Reference:

Maximum Electrode Gap for Used Spark Plug

ELECTRODE GAP SPECIFICATION

Electrode Gap
1.3 mm (0.0512 in.)

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

Fig 7: Identifying Spark Plug Electrode Gap

Electrode Gap for New Spark Plug

ELECTRODE GAP SPECIFICATION

Electrode Gap
1.0 to 1.1 mm (0.0394 to 0.0433 in.)

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

Air pressure:

588 kPa (6.0 kgf/cm ² , 85 psi)

Duration:

20 seconds or less

Fig 8: Cleaning Spark Plug
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.