On-Vehicle Inspection

PERFORM SPARK TEST

Check for DTCs. Refer to DTC CHECK / CLEAR .
NOTE:
If any DTC is output, perform troubleshooting procedures for that DTC.
Check if sparks occur.
1. Remove the ignition coils and spark plugs. Refer to REMOVAL .
2. Install the spark plug to the ignition coil and connect the ignition coil connector.
3. Disconnect the 8 injector connectors.
4. Ground the spark plug.
  
  Fig 1: Checking For Sparks And Ignition
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Visually check that sparks occur while the engine is being cranked.
  NOTE:
  - Be sure to ground the spark plug when checking.
  - If the ignition coil has been struck or dropped, replace it.
  - Do not crank the engine for more than 2 seconds.

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

RESULT

Result	Proceed to
NG	Connect securely
OK	Go to next step

Perform a spark test on each ignition coil with igniter.

If there is a cylinder where sparks do not occur, replace its ignition coil with the ignition coil of a cylinder where sparks occur normally.

Crank the engine and visually check that sparks occur at the cylinder with the normally operating ignition coil.

RESULT

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

Check spark plug.

RESULT

Result	Proceed to
NG	Replace spark plug
OK	Go to next step

Check the power supply to the ignition coil with igniter.

Turn the engine switch on (IG).

Check that there is battery voltage at the ignition coil positive (+) terminal.

RESULT

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

Check the VVT sensor for intake side. Refer to DTC P0340: Camshaft Position Sensor Circuit Malfunction; DTC P0342: Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor); DTC P0343: Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor); DTC P0345: Camshaft Position Sensor "A" Circuit (Bank 2); DTC P0347: Camshaft Position Sensor "A" Circuit Low Input (Bank 2); DTC P0348: Camshaft Position Sensor "A" Circuit High Input (Bank 2) .
Check the VVT sensor for exhaust side. Refer to DTC P0365: Camshaft Position Sensor "B" Circuit (Bank 1); DTC P0367: Camshaft Position Sensor "B" Circuit Low Input (Bank 1); DTC P0368: Camshaft Position Sensor "B" Circuit High Input (Bank 1); DTC P0390: Camshaft Position Sensor "B" Circuit (Bank 2); DTC P0392: Camshaft Position Sensor "B" Circuit Low Input (Bank 2); DTC P0393: Camshaft Position Sensor "B" Circuit High Input (Bank 2) .
Check the camshaft position sensor. Refer to DTC P1340: Camshaft Position Sensor "A" (Bank 1 Sensor 2); DTC P1342: Camshaft Position Sensor "A" Low Input (MRE); DTC P1343: Camshaft Position Sensor "A" High Input (MRE) .
Check the crankshaft position sensor. Refer to DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0337: Crankshaft Position Sensor "A" Circuit Low Input; DTC P0338: Crankshaft Position Sensor "A" Circuit High Input; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent .
Check the IGT signal circuit. Refer to 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; DTC P0355: Ignition Coil "E" Primary / Secondary Circuit; DTC P0356: Ignition Coil "F" Primary / Secondary Circuit; DTC P0357: Ignition Coil "G" Primary / Secondary Circuit; DTC P0358: Ignition Coil "H" Primary / Secondary Circuit .
Connect the 8 injector connectors.
Install the ignition coils and spark plugs. Refer to INSTALLATION .

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.

Using a megohmmeter, measure the insulation resistance.

Fig 2: Measuring Insulation Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Insulation Resistance

Tester Connection	Condition	Specified Condition
Spark plug (terminal part) - Body ground	Always	10 MΩ or higher

If the insulation resistance is below the specified range, replace the spark plug.

HINT:

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.
3. Visually check the spark plug.
  
  Fig 3: Identifying Spark Plug Condition
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  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.

Recommended Spark Plug

Manufacturer	Type
DENSO made	SK20HR11

HINT:

Fig 4: Checking Spark Plug Electrode Gap

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

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

Electrode gap for a 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.

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

Fig 5: Cleaning Electrode With Spark Plug Cleaner

Standard air pressure

588 kPa (6.0 kgf/cm² , 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.