On-Vehicle Inspection [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM SPARK TEST

Pre-procedure1

Check for DTCs.
Powertrain > Engine > Trouble Codes

NOTE:
If any DTCs are output, perform troubleshooting in accordance with the procedure for each DTC.
Remove the 6 ignition coil assemblies and 6 spark plugs.
HINT:

Refer to REMOVAL [12/2023 - ]

Disconnect the 2 No. 5 engine wire connectors (for Port Injection).

NOTE:

Perform this step in order to stop fuel injection to prevent damage to the catalyst due to unburned fuel.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the No. 6 engine wire connector and No. 7 engine wire connector (for Direct Injection).

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

Perform this step in order to stop fuel injection to prevent damage to the catalyst due to unburned fuel.

Install the spark plug to the ignition coil assembly, and then connect the ignition coil assembly connector.

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

Ground the spark plug.

Check that spark occurs at each spark plug while the engine is being cranked.
NOTE:
- Be sure to ground the spark plugs when checking them.
- Do not crank the engine for more than 2 seconds.
- If an ignition coil assembly or spark plug has been struck or dropped, replace it.
HINT:

If spark does not occur, perform the following procedure.

Post-procedure1

Connect the No. 6 engine wire connector and No. 7 engine wire connector (for Direct Injection).
Connect the 2 No. 5 engine wire connectors (for Port Injection).
Install the 6 spark plugs and 6 ignition coil assemblies.
HINT:

Refer to INSTALLATION [12/2023 - ]
Check for DTCs.
Powertrain > Engine > Clear DTCs
Clear the DTCs.
Powertrain > Engine > Trouble Codes

INSPECT IGNITION COIL ASSEMBLY AND SPARK TEST

Pre-procedure1

None

Check that the ignition coil assembly connector is securely connected.

Result

Result	Action
NG	Connect securely
OK	Go to next step

Perform a spark test on each ignition coil assembly.

Replace the ignition coil assembly with a known good one.

Perform the spark test again.

Result

Result	Action
NG	Go to next step
OK	Replace ignition coil assembly

Perform a spark test on each spark plug.

Replace the spark plug with a known good one.

Perform the spark test again.

Result

Result	Action
NG	Inspect the ignition system HINT: Refer to DTC P0351-13: Ignition Coil "A" Circuit Open; DTC P0352-13: Ignition Coil "B" Circuit Open; DTC P0353-13: Ignition Coil "C" Circuit Open; DTC P0354-13: Ignition Coil "D" Circuit Open; DTC P0355-13: Ignition Coil "E" Circuit Open; DTC P0356-13: Ignition Coil "F" Circuit Open [12/2023 - ]
OK	Replace spark plug

NOTE:

If an ignition coil assembly or spark plug has been struck or dropped, replace it.

Post-procedure1

Connect the No. 6 engine wire connector and No. 7 engine wire connector (for Direct Injection).
Connect the 2 No. 5 engine wire connectors (for Port Injection).
Install the 6 spark plugs and 6 ignition coil assemblies.
HINT:

Refer to INSTALLATION [12/2023 - ]
Check for DTCs.
Powertrain > Engine > Clear DTCs
Clear the DTCs.
Powertrain > Engine > Trouble Codes

INSPECT SPARK PLUG

NOTE:

Do not damage the iridium tip and platinum tip.
Check the iridium tip visually since the iridium tip may be damaged.
Never attempt to adjust the electrode gap of a used spark plug.
Replace with new spark plugs if extremely dirty due to sludge, etc.
Replace with new spark plugs if damaged at all.
Replace with a new spark plug if it has been struck or dropped.
When replacing with a new spark plug, do not remove the cap for protecting the spark plug tip until it is installed to the engine.

Pre-procedure1

None

Check the electrode.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Body Ground

Using a megohmmeter, measure the insulation resistance.

Standard Insulation Resistance

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

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.

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

Start the engine.
NOTE:
Do not perform this step when any of the following DTCs are output; P0300-00, P0300-27, P0300-85, P0301-00, P0302-00, P0303-00, P0304-00, P0305-00, P0306-00 (Cylinder Misfire Detected).
Quickly accelerate the engine to 2500 RPM 5 times.
NOTE:
Do not perform this step when any of the following DTCs are output; P0300-00, P0300-27, P0300-85, P0301-00, P0302-00, P0303-00, P0304-00, P0305-00, P0306-00 (Cylinder Misfire Detected).
Remove the spark plug.
HINT:

Refer to REMOVAL [12/2023 - ]
Visually check the spark plug.
HINT:

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	Spark Plug Type
DENSO	FK20HBR8

Check the spark plug electrode gap.

Maximum Electrode Gap for Used Spark Plug

Specified Condition	Result
1.1 mm 0.0433 in.	mm in.

NOTE:

Never attempt to adjust the electrode gap of a used spark plug.

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

*a	Spark Plug Electrode Gap
*b	Iridium Tip
*c	Platinum Tip

Standard Electrode Gap for New Spark Plug

Specified Condition	Result
0.7 to 0.8 mm 0.0276 to 0.0315 in.	mm in.

Post-procedure1

Install the spark plug.
HINT:

Refer to INSTALLATION [12/2023 - ]

PERFORM INITIALIZATION
1. Perform "Inspection After Repair" after replacing a spark plug or ignition coil assembly.
  HINT:
  
  Refer to INITIALIZATION [12/2023 - ]