On-Vehicle Inspection

CHECK IGNITION COIL ASSEMBLY 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 that spark occurs.
1. Remove the ignition coils and spark plugs (See IGNITION COIL AND SPARK PLUG ).
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 then connect the ignition coil connector.
4. Ground the spark plug.
5. Check that spark occurs while the engine is being cranked.
  NOTE:
  - Be sure to ground the spark plugs when checking them.
  - If the ignition coil has been struck or dropped, replace it.
  - Do not crank the engine for more than 2 seconds.
  If spark does not occur, perform the following procedure.
  
  Fig 2: Checking Spark Plug Spark
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Perform the following spark test procedure.

Check that the ignition coil connector is securely connected.

Result

RESULT CHART

Result	Action
NG	Connect securely
OK	Go to next step

Perform a spark test on each ignition coil.

Replace the ignition coil with a known good one.

Perform the spark test again.

Result

RESULT CHART

Result	Action
NG	Go to next step
OK	Replace ignition coil

Perform a spark test.

Replace the spark plug with a known good one.

Perform the spark test again.

Result

RESULT CHART

Result	Action
NG	Go to next step
OK	Replace the spark plug

Check power supply to each ignition coil.

Disconnect each ignition coil connector.

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

Standard Resistance (Check for Open)

TESTER CONNECTION SPECIFIED CONDITION CHART

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

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.

Fig 3: Identifying Ignition Coil Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

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 CHART

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

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

Result

RESULT CHART

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

Check the IGT signal 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 CHART

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

INSPECT SPARK PLUG

Check the electrode.
1. Using a megohmmeter, measure the resistance.
  Standard 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 4: Measuring Resistance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Alternative inspection method:
1. Quickly accelerate the engine to 4000 rpm 5 times.
2. Remove each spark plug (See IGNITION COIL AND 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 on its threads and insulator.

Fig 5: Identifying Spark Plug Condition

If there is any damage, replace the spark plug.

Recommended Spark Plug

MANUFACTURER CHART

Manufacturer	Spark Plug Type
DENSO	SC20HR11

Check the spark plug electrode gap.

Maximum Electrode Gap for Used Spark Plug

SPARK PLUG ELECTRODE GAP CHART

Electrode Gap
1.3 mm (0.0512 in.)

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

Electrode Gap for New Spark Plug

ELECTRODE GAP REFERENCE

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

Fig 6: Identifying Spark Plug Electrode Gap

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 (6.0 kgf/cm ² , 85 psi)

Standard duration: 20 seconds or less .

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.

Fig 7: Cleaning Spark Plugs
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002